Extensible handheld analog quantity testing device

Abstract

The utility model provides an extensible hand-held analog quantity testing device which comprises a hand-held host and an expansion device which are mutually independent. A voltage interface of the handheld host is connected with a first voltage interface of the tested device and is used for providing voltage for the tested device; the current interface of the handheld host is connected with the first current interface of the tested device and is used for providing current for the tested device; a switching value interface of the handheld host is connected with a switching value interface of the tested device and is used for acquiring a switching value signal of the tested device; the optical fiber communication interface of the handheld host is connected with the optical fiber communication interface of the expansion device; the output interface of the expansion device is connected with the energy supply interface of the tested device and is used for providing voltage and / or current for the tested device; the combined application of the handheld host and the expansion device is realized by adding the external expansion accessory, the problem that the handheld host cannot meet all detection requirements is solved on the basis of not increasing the weight of the handheld host, and the applicability of the handheld host is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of test systems, and more specifically, particularly relates to an expandable handheld analog quantity test device. Background Art

[0002] Compared with the traditional single-chip tester, the relay protection tester with built-in industrial computer has a large LCD display and touch screen, which is more intelligent and convenient; however, the relay protection tester with built-in industrial computer still has weight restrictions. For example, traditional test equipment has 4 120v voltages and 3 or 6 20A current outputs, and weighs between 15Kg-20Kg. The heavy weight limits the improvement of work efficiency.

[0003] As the technology matures, a handheld relay protection tester is introduced. The handheld relay protection tester weighs only 3Kg, which is convenient for on-site use. However, the handheld relay protection tester achieves weight reduction by reducing output performance indicators. The handheld relay protection tester has few output voltage and current channels (4 channels of 120V voltage, 3 channels of 10A current), small output amplitude, and low power, and cannot meet all on-site testing needs. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an expandable handheld analog quantity testing device, which is used to solve the problem that the handheld host cannot meet all detection requirements without increasing the weight of the handheld host, thereby improving the applicability of the handheld host.

[0005] The present application discloses an expandable handheld analog quantity testing device, comprising: a handheld host and an expansion device;

[0006] The handheld host and the expansion device are independent of each other;

[0007] The voltage interface of the handheld host is connected to the first voltage interface of the device under test, and is used to provide voltage to the device under test;

[0008] The current interface of the handheld host is connected to the first current interface of the device under test, and is used to provide current to the device under test;

[0009] The switch quantity interface of the handheld host is connected to the switch quantity interface of the device under test, and is used to collect the switch quantity signal of the device under test;

[0010] The optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extension device;

[0011] The output interface of the extension device is connected to the power supply interface of the device under test, and is used to provide voltage and / or current to the device under test.

[0012] Optionally, the expansion device includes at least one of an expansion current module and an expansion voltage module;

[0013] When the extension device includes an extension current module, the optical fiber communication interface of the extension current module is connected to the first optical fiber control interface of the handheld host; the output interface of the extension current module is connected to the second current interface of the device under test, so as to provide current to the device under test;

[0014] When the extension device includes an extension voltage module, the optical fiber communication interface of the extension voltage module is connected to the second optical fiber control interface of the handheld host; the output interface of the extension voltage module is connected to the second voltage interface of the device under test, so as to provide voltage to the device under test.

[0015] Optionally, the extension device includes: a first optical transceiver module, a first analog-to-digital conversion module, a first digital-to-analog conversion module, a power amplifier, and a first processing module;

[0016] The first end of the first optical transceiver module is connected to the optical fiber communication interface of the extension device;

[0017] The second end of the first optical transceiver module is connected to the communication end of the first processing module;

[0018] The output end of the first processing module is connected to the input end of the first digital-to-analog conversion module;

[0019] The input end of the first processing module is connected to the output end of the first analog-to-digital conversion module;

[0020] An input end of the first analog-to-digital conversion module is connected to a first end of the power amplifier;

[0021] The output end of the first digital-to-analog conversion module is connected to the second end of the power amplifier;

[0022] The output end of the power amplifier serves as the output end of the expansion device.

[0023] Optionally, when the extension device includes an extension current module, the power amplifier includes a first current amplifier;

[0024] When the extension device comprises an extension voltage module, the power amplifier comprises a first voltage amplifier.

[0025] Optionally, the first analog-to-digital conversion module includes: a first isolator and a first analog-to-digital converter; the input end of the first analog-to-digital converter serves as the input end of the first analog-to-digital conversion module; the output end of the first analog-to-digital converter is connected to the first end of the first isolator, and the second end of the first isolator serves as the output end of the first analog-to-digital conversion module;

[0026] The first digital-to-analog conversion module includes a second isolator and a first digital-to-analog converter; the first end of the second isolator serves as the input end of the first digital-to-analog conversion module; the second end of the second isolator is connected to the input end of the first digital-to-analog converter, and the output end of the first digital-to-analog converter serves as the output end of the first digital-to-analog conversion module.

[0027] Optionally, the handheld host includes: an optical coupling module, a second processing module, a second digital-to-analog conversion module, a second current amplifier, a second voltage amplifier, a detection bridge module and a second optical transceiver module;

[0028] The first end of the second optical transceiver module is connected to the transceiver end of the second processing module; the other end of the second optical transceiver module is connected to the optical fiber communication interface of the handheld host;

[0029] The first end of the second processing module is respectively connected to the input end of the second digital-to-analog conversion module, the output end of the detection bridge module and the switch output interface of the handheld host through the optical coupling module;

[0030] The output end of the second digital-to-analog conversion module is connected to the input end of the second voltage amplifier and the input end of the second current amplifier respectively;

[0031] The output end of the second current amplifier is connected to the current interface of the handheld host;

[0032] The output end of the second voltage amplifier is connected to the voltage interface of the handheld host;

[0033] The input end of the detection bridge module is connected to the switch input interface of the handheld host.

[0034] Optionally, the handheld host further includes: a second analog-to-digital conversion module, a power channel switching and charging management module, a current and voltage adjustment module, a touch LCD screen, a GPS module, a buzzer, an indicator light and a fan;

[0035] The fan is connected to the second processing module via the optical coupling module;

[0036] The power channel switching and charging management module is used to provide power to various devices in the handheld host;

[0037] The indicator light, the buzzer, the touch LCD screen and the GPS module are all connected to the second processing module;

[0038] The input end of the second analog-to-digital conversion module is respectively connected to the second current amplifier, the current and voltage adjustment module and the power channel switching and charging management module;

[0039] The output end of the second analog-to-digital conversion module is connected to the second processing module through the optical coupling module;

[0040] The input end of the current and voltage adjustment module receives the control division signal of the second processing module through the second digital-to-analog conversion module.

[0041] Optionally, the handheld host and the extension device are respectively used as a device, and the optical transceiver modules in the two devices include: an optical module; the processing modules in the two devices include a controller and a signal transceiver;

[0042] The VccR pin of the optical module is connected to the first power supply through the first impedance unit; the TX_GND pin of the optical module is grounded; and the RX_GND pin of the optical module is grounded;

[0043] The optical module includes: an optical drive protection circuit, a photoelectric conversion module and a control module;

[0044] The photoelectric conversion module and the optical drive protection circuit are both connected to the optical fiber communication interface of the device;

[0045] The optical drive protection circuit is used to convert the digital signal of the signal transceiver in the same device into an optical signal, and transmit the optical signal to another device; the first end of the optical drive protection circuit is connected to the Tx Dis pin of the controller, and the connection point is connected to the first power supply through a second impedance unit; a resistor is set between the positive and negative electrodes of the second end of the optical drive protection circuit; the positive electrode of the second end of the optical drive protection circuit is connected to the S0+ pin of the signal transceiver through a first capacitor; the negative electrode of the second end of the optical drive protection circuit is connected to the S0- pin of the signal transceiver through a second capacitor;

[0046] The photoelectric conversion module is used to receive an optical signal from another device, convert the optical signal into an electrical signal, and transmit the electrical signal to the signal transceiver in the same device; the positive electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the third capacitor and one end of the first resistor, and the second end of the third capacitor is respectively connected to the S1+ pin of the signal transceiver, one end of the second resistor and one end of the third resistor; the negative electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the fourth capacitor and one end of the fourth resistor, and the second end of the fourth capacitor is respectively connected to the S1- pin of the signal transceiver, one end of the fifth resistor and one end of the sixth resistor; the second end of the photoelectric conversion module is connected to the Rx_L0S pin of the controller; the connection point is connected to the first power supply through the seventh resistor; the other end of the third resistor and the other end of the sixth resistor are both connected to the first power supply; the other end of the first resistor, the other end of the second resistor, the other end of the fourth resistor and the other end of the fifth resistor are all grounded;

[0047] The three ends of the control module are connected to the SDA pin, SCL pin and MODULE pin of the controller respectively in a one-to-one correspondence; the three connection points are connected to the first power supply through their respective corresponding resistors.

[0048] Optionally, the second impedance unit includes: an eighth resistor and a first inductor; the first impedance unit includes: a second inductor;

[0049] One end of the first inductor is connected to the VccR pin, and the connection point is grounded through a first capacitor unit;

[0050] One end of the eighth resistor is connected to the first end of the optical drive protection circuit and the Tx Dis pin respectively; the other end of the eighth resistor is connected to one end of the second inductor; the connection point between the eighth resistor and the second inductor is grounded through a fifth capacitor;

[0051] The other end of the second inductor is connected to the other end of the first inductor, and the connection points are respectively connected to one end of the second capacitor unit and the first power supply;

[0052] The other end of the second capacitor unit is grounded.

[0053] Optionally, the handheld host provides four 120V voltages to the device under test through a first voltage interface;

[0054] The handheld host provides three 10A currents to the device under test through a first current interface;

[0055] The extended voltage module provides 6 120V voltages for the device under test;

[0056] The extended current module provides 6 20A currents for the device under test. It can be seen from the above technical solution that the expandable handheld analog quantity test device provided by the utility model may include: a handheld host and an extended device that are independent of each other; the voltage interface of the handheld host is connected to the first voltage interface of the device under test, which is used to provide voltage to the device under test; the current interface of the handheld host is connected to the first current interface of the device under test, which is used to provide current to the device under test; the switch quantity interface of the handheld host is connected to the switch quantity interface of the device under test, which is used to collect the switch quantity signal of the device under test; the optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extended device; the output interface of the extended device is connected to the power supply interface of the device under test, which is used to provide voltage and / or current to the device under test; that is, by adding an external extended accessory, the combined application of the handheld host and the extended device is realized, and the problem that the handheld host cannot meet all detection requirements is solved without increasing the weight of the handheld host, thereby improving the applicability of the handheld host. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 It is a schematic diagram of an expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0059] Figure 2 It is a communication schematic diagram involved in an expandable handheld analog quantity test device provided by an embodiment of the utility model;

[0060] Figure 3 It is a schematic diagram of another expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0061] Figure 4 It is a schematic diagram of another expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0062] Figure 5 It is a schematic diagram of a handheld host involved in another expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0063] Figure 6 It is a schematic diagram of a handheld host involved in an expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0064] Figure 7 It is a schematic diagram of an optical transceiver module in an expandable handheld analog quantity test device provided by an embodiment of the utility model;

[0065] Figure 8 It is a front view of an expansion device involved in an expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0066] Fig. 9 It is a side view of an expansion device involved in an expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0067] Fig.10 This is a diagram of an expansion device involved in an expandable handheld analog quantity test device provided by an embodiment of the utility model;

[0068] Fig.11 It is a cross-sectional view of an expansion device involved in an expandable handheld analog quantity testing device provided by an embodiment of the utility model;

[0069] Fig.12 It is a schematic diagram of an expansion device involved in an expandable handheld analog quantity testing device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0071] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0072] The embodiment of the present application provides an expandable handheld analog quantity testing device, which is used to solve the problem that the handheld relay protection tester in the prior art has a small number of output voltage and current paths (4 paths of 120V voltage, 3 paths of 10A current), a small output amplitude, and low power, and cannot meet all on-site testing requirements.

[0073] See also Figure 1 The expandable handheld analog quantity testing device includes: a handheld host and an expansion device.

[0074] The handheld host may have multiple independent interfaces, such as a voltage interface, a current interface, and an optical fiber communication interface; the interfaces of the handheld host will not be described one by one here, and it depends on the actual situation, and they are all within the protection scope of this application.

[0075] The voltage interface of the handheld host is connected to the first voltage interface of the device under test, and is used to provide voltage to the device under test.

[0076] It should be noted that the number of voltage interfaces of the handheld host can be multiple, for example, 4, and then the handheld host can provide 4 voltages for the device under test. More specifically, the handheld host can provide 4 120V voltages for the device under test. Of course, it is not excluded that the number of voltage interfaces of the handheld host is other values, which are not specifically limited here and can be determined according to actual conditions, and are all within the protection scope of this application.

[0077] The current interface of the handheld host is connected to the first current interface of the device under test, and is used to provide current to the device under test.

[0078] It should be noted that the number of current interfaces of the handheld host can be multiple, for example, 3, and then the handheld host can provide 3 currents for the device under test. More specifically, the handheld host can provide 3 10A currents for the device under test. Of course, it is not excluded that the number of current interfaces of the handheld host is other values, which are not specifically limited here and can be determined according to actual conditions, and are all within the protection scope of this application.

[0079] The switch quantity interface of the handheld host is connected to the switch quantity interface of the device under test, and is used to collect the switch quantity signal of the device under test.

[0080] Specifically, the switch quantity interface includes: a switch quantity input interface and a switch quantity output interface; the switch quantity input interface of the handheld host is used to receive a switch signal of the device under test. The switch quantity output interface of the handheld host is used to output a control signal to the device under test.

[0081] The switch quantity input interface of the handheld host is connected to the output interface of the device under test; the switch quantity output interface of the handheld host is connected to the control interface of the device under test.

[0082] The optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extension device, that is, the handheld host can control the working state of the extension device, for example, control the operation and output power of the extension device.

[0083] Specifically, the optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extension device in a one-to-one correspondence.

[0084] The handheld host is connected to the expansion device via an optical fiber communication interface. The expansion device also has an optical fiber communication interface, which is mainly used to realize data interaction between the expansion device and the handheld host.

[0085] In order to realize that the handheld host can synchronously control multiple expansion devices, the expansion interface of the handheld host adopts a high-speed optical fiber communication interface. That is, the communication rate between the processing module in the handheld host and the optical fiber communication interface can be 2.5G rate (such as Figure 2 shown).

[0086] The output interface of the extension device is connected to the power supply interface of the device under test, and is used to provide voltage and / or current to the device under test.

[0087] It should be noted that the number of output interfaces of the expansion device can be multiple, which is not specifically limited here. The output interface of the expansion device can include at least one of a current interface and a voltage interface, the current interface provides current to the device under test, and the voltage interface provides voltage to the device under test.

[0088] The expansion device can be designed with modular structure, with high precision, stable performance and simple structure. Each expansion device has independent functions and standard interfaces for input and output. The programming between each expansion device and the handheld is carried out in units of functional modules. The connection relationship between input and output is determined by the defined interface sequence, which simplifies the operations such as debugging and maintenance. To change the function of a certain expansion device, you only need to change the corresponding module. The test system function supports user personalized matching, and various types of expansion devices and hosts are combined in various ways to form a new multi-functional and high-performance test system, which is convenient for reuse, upgrading and maintenance.

[0089] The number of expansion devices can be multiple, which is not specifically limited here. Each expansion device is independent of each other, and the optical fiber communication interface of the handheld host sends a control signal to the expansion device through an optical fiber cable, and each optical fiber communication interface of the handheld host can be connected to an expansion device.

[0090] The handheld host has multiple independent interfaces. It can meet all the test functions of handheld testers on the market. At the same time, the handheld host can be connected to external expansion devices to realize all the test functions of conventional relay protection and realize multiple application methods in multiple application scenarios.

[0091] On-site maintenance personnel can use a handheld host to test the device under test, interact with the on-site device through simple human-computer interaction software, and then test the device under test according to the designed special test module, compare it with the feedback of the device under test, and generate a report result. Based on the results, it can be determined whether it is qualified, and a test report in a standard format can be automatically generated. Figure 3 As shown, the handheld host provides 4 120 voltages and 3 10A currents for the device under test; and connects the device under test through two pairs of switch input / outputs and 4 pairs of optical Ethernet interfaces. This application mode uses the handheld host to work independently, which can meet 70% of the on-site detection needs.

[0092] When high current testing is required during on-site testing, the handheld host and expansion device can be used in combination to meet all on-site testing needs.

[0093] Before starting the test, the handheld host reads the hardware information of itself and the expansion device to determine the communication status of its own optical fiber communication interface and the type, position sequence, number of output interfaces of the external expansion device, and other information, and maps the corresponding channels to the parameter setting groups of the test interface. According to the test requirements, the user can set the parameters of the parameter setting group to simulate the output parameters of the control module in the power system when the power system is in a fault state.

[0094] At the beginning of the test, the handheld host sends output parameters, which include: amplitude, phase, frequency, and output time. Part of the output parameters is used as the analog voltage and current output of the handheld host, that is, to control the voltage output and current output of the handheld host. Part of the output parameters is output to the expansion device through the fiber optic communication interface. At the same time, the handheld host sends a synchronization signal to the expansion module through the fiber optic communication interface, so that the expansion device and the handheld host are on the same time axis. The output voltage and output current of the handheld host and the output voltage and output current of the expansion unit are all output to the device under test; and the switch signal of the device under test is collected, and the test results are obtained by judging and calculating the switch signal. Figure 4 As shown, the handheld host provides 4 120 voltages and 3 10A currents to the device under test; and connects the device under test through two pairs of switch input / output; the optical fiber communication interface of the handheld host and the expansion device (such as Figure 4 The expansion device provides 6 120V voltages and 6 20A currents for the device under test.

[0095] In this embodiment, the expandable handheld analog quantity testing device includes: a handheld host and an extension device that are independent of each other; the voltage interface of the handheld host is connected to the first voltage interface of the device under test, for providing voltage to the device under test; the current interface of the handheld host is connected to the first current interface of the device under test, for providing current to the device under test; the switch quantity interface of the handheld host is connected to the switch quantity interface of the device under test, for collecting the switch quantity signal of the device under test; the optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extension device; the output interface of the extension device is connected to the power supply interface of the device under test, for providing voltage and / or current to the device under test; that is, by adding an external extension accessory, the combined application of the handheld host and the extension device is realized, and the problem that the handheld host cannot meet all detection requirements is solved without increasing the weight of the handheld host, thereby improving the applicability of the handheld host.

[0096] It should be noted that the handheld host includes: a control unit, and may also include an analog unit, a switch plug-in, and a power plug-in; the power plug-in may be used to power the handheld host; the switch plug-in may be used to provide a switch signal for the handheld host, and the switch plug-in and the power plug-in may be external; the control unit is the control circuit inside the handheld host, and the analog unit may include outputs of the control unit, such as current output and voltage output. Figure 5 As shown, the control component and the simulation component are respectively located in the front and rear parts of the overall structure.

[0097] Control the main functions of the whole device: control SoC control mainboard, human-machine interface, time synchronization interface, switch quantity test interface, analog ADC, DAC, control switch quantity interface, etc.

[0098] The circuit components that control the entire device include: LCD screen + touch panel, GPS antenna, and switch quantity test terminal (aviation plug).

[0099] The terminal panel that controls the entire device includes: RJ-45 network port, USB-A port, GPS, Beidou synchronous receiving antenna (SMA): satellite lock and second pulse indicator lights, device status indicator lights: power, operation, overheat, overload, aviation plug: 3, 4 groups of output + 3, 4 groups of input, aviation plug (optional): 5-8 groups of output or 5-8 groups of input, aviation plug (optional): small signal 4U3I. Aviation plug is an aviation plug, which is a popular name for connectors.

[0100] The following is an explanation of the circuit that controls the entire device, i.e., the circuit of the handheld host:

[0101] like Figure 6 As shown, the handheld host includes: an optical coupling module (such as Figure 6As shown, it includes multiple optical couplers), a second processing module, a second digital-to-analog conversion module (such as Figure 6 As shown in the figure, DAC*16), a second current amplifier, a second voltage amplifier, a detection bridge module and a second optical transceiver module.

[0102] The first end of the second optical transceiver module is connected to the transceiver end of the second processing module; the other end of the second optical transceiver module is connected to the optical fiber communication interface of the handheld host; then the second optical transceiver module converts the digital signal output by the processing module into an optical signal, outputs it to the optical fiber communication interface, and converts the optical signal received through the optical fiber communication interface into a digital signal and outputs it to the second processing module.

[0103] The optical coupling module includes a plurality of optical couplers, and the number of the first ends of the processing module is multiple; each optical coupler corresponds to the first end of the processing module one by one.

[0104] The first end of the second processing module is respectively connected to the input end of the second digital-to-analog conversion module, the output end of the detection bridge module and the switch output interface of the handheld host through the optical coupling module.

[0105] The second processing module may be Xilinx XC7Z030, wherein the PS (Processing System) is a dual-core ARM Cortex-A9 MP core-1GHz, and the PL (Progarmmable Logic) is Kintex-7, with a power of 3-3.5W.

[0106] Specifically, the first first end of the second processing module is connected to one end of the first optical coupler, and the other end of the first optical coupler is connected to the output end of the detection bridge module.

[0107] The second first end of the second processing module is connected to one end of the second optical coupler, and the other end of the second optical coupler is connected to the switch output interface of the handheld host.

[0108] The third first end of the second processing module is connected to one end of the third optical coupler, and the other end of the third optical coupler is connected to the input end of the second digital-to-analog conversion module.

[0109] The output end of the second digital-to-analog conversion module is connected to the input end of the second current amplifier and the input end of the second voltage amplifier respectively.

[0110] Specifically, the second digital-to-analog conversion module converts the digital signal output by the second processing module into an analog signal, such as an electrical signal, and outputs it to the second current amplifier and the second voltage amplifier. The second digital-to-analog conversion module may include 16 digital-to-analog converters. The specific structure of the second digital-to-analog conversion module will not be described here one by one, and it can be determined according to the actual situation, and all are within the protection scope of this application.

[0111] The second digital-to-analog conversion module may have multiple output terminals. For example, the voltage output terminal of the second digital-to-analog conversion module outputs a voltage signal to a voltage amplifier; and the current output terminal of the second digital-to-analog conversion module outputs a current signal to a current amplifier.

[0112] The output end of the second current amplifier is connected to the current interface of the handheld host; that is, the output end of the second current amplifier is connected to the first current interface of the device under test through the current interface of the handheld host. The second current amplifier can have multiple output ends, and of course, multiple current amplifiers can be set, and the interface of each current amplifier corresponds to each current interface of the handheld host one by one, thereby providing 3 10A currents for the device under test.

[0113] The output end of the second voltage amplifier is connected to the voltage interface of the handheld host. That is, the output end of the second voltage amplifier is connected to the first voltage interface of the device under test through the voltage interface of the handheld host. The second voltage amplifier may have multiple output ends, and of course, multiple voltage amplifiers may be provided, and the interface of each voltage amplifier corresponds to each voltage interface of the handheld host one by one, thereby providing 4 120V voltages for the device under test.

[0114] The input end of the detection bridge module is connected to the switch quantity input interface of the handheld host. That is, the detection bridge detects the switch quantity signal of the device under test and transmits it to the second processing module through the optical coupling module.

[0115] Optional, see also Figure 6 The handheld host also includes: a second analog-to-digital conversion module (such as Figure 6 ADC*8 shown), power channel switching and charging management module, current and voltage adjustment module, touch LCD screen, GPS module, buzzer, indicator light and fan.

[0116] The fan is connected to the second processing module via the optical coupling module.

[0117] Specifically, the fourth first end of the second processing module is connected to one end of the fourth optical coupler in the optical coupler module; the other end of the fourth optical coupler is connected to the fan. The second processing module is used to control the running state of the fan through the fourth optical coupler.

[0118] The power channel switching and charging management module is used to provide power to various devices in the handheld host; specifically, it is the total power supply for the entire control plug-in and the analog plug-in and the switch plug-in.

[0119] The power channel switching and charging power management is to adjust the power supply according to the current operating state or voltage and current output state to prevent the battery from discharging quickly.

[0120] The power supply parameters of the power supply can be +12VA, 3W.

[0121] The indicator light, buzzer, touch LCD screen and GPS module are all connected to the second processing module. The touch LCD screen can be 10 inches and 6W.

[0122] The indicator light may be multiple in number and is used to indicate the power, operation, overheat, and overload status of the handheld host.

[0123] Touch the LCD screen to interact with the user.

[0124] The GPS module may be an integrated circuit that integrates an RF radio chip, a baseband chip, a core CPU, and related peripheral circuits.

[0125] The buzzer can be used to sound an alarm, etc.

[0126] The input end of the second analog-to-digital conversion module is respectively connected to the second current amplifier, the current and voltage adjustment module and the power channel switching and charging management module to collect the port voltage of the current amplifier and the power supply voltage of the current and voltage adjustment module.

[0127] Specifically, each input end of the second analog-to-digital conversion module corresponds one-to-one to the second current amplifier, the current and voltage adjustment module, and the power channel switching and charging management module; the second current amplifier, the current and voltage adjustment module, and the power channel switching and charging management module are connected to the corresponding input ends of the second analog-to-digital conversion module.

[0128] The output end of the second analog-to-digital conversion module is connected to the second processing module through the optical coupling module.

[0129] The output end of the second analog-to-digital conversion module is connected to one end of the fifth optical coupler of the optical coupler module, and the other end of the fifth optical coupler is connected to the fifth first end of the second processing module.

[0130] The second voltage amplifier is also connected to the second processing module via the sixth optical coupler of the optical coupler module, so as to implement detection and alarm for the second voltage amplifier.

[0131] The second current amplifier is also connected to the second processing module via the seventh optical coupler of the optical coupler module, so as to implement detection and alarm for the second current amplifier.

[0132] The second analog-to-digital conversion module may include 8 analog-to-digital converters. Of course, it may also be other numbers of analog-to-digital converters. The specific structure of the second analog-to-digital conversion module will not be described in detail here.

[0133] Specifically, the second analog-to-digital conversion module can receive the output voltage of the second voltage amplifier and the output current of the second current amplifier, and feed back the output voltage to the second processing module.

[0134] The 5th optocoupler and the 3rd optocoupler can be high-speed optocouplers.

[0135] The input end of the current and voltage adjustment module receives the control division signal of the second processing module through the second digital-to-analog conversion module.

[0136] The current and voltage adjustment module is used to adjust the supply voltage of the second voltage amplifier and the second current amplifier.

[0137] That is, the second processing module adjusts the supply voltage of the second current amplifier and the second voltage amplifier by controlling the gear position of the voltage and current adjustment module.

[0138] Optional, such as Figure 7 As shown, the optical transceiver module in the handheld host includes: an optical module (such as Figure 7 The processing module of the handheld host includes a controller (such as HFBR-57E5APZ shown in FIG. Figure 7 PROTOCOL) and signal transceiver (such as Figure 7 SerDes shown).

[0139] The VccR pin of the optical module is connected to the first power supply through the first impedance unit; the TX_GND pin of the optical module is grounded; the RX_GND pin of the optical module is grounded; the VccT pin of the optical module is connected to the first power supply through the corresponding resistor; the TD+ pin of the optical module is connected to the S0+ pin of the signal transceiver; the TD- pin of the optical module is connected to the S0- pin of the signal transceiver; the RD+ pin of the optical module is linked to the S1+ pin of the signal transceiver; the RD- pin of the optical module is linked to the S1- pin of the signal transceiver; the RX_L0S pin of the optical module is connected to the Rx_L0S of the controller; the MOD_DEF0 pin of the optical module is connected to the MODULE pin of the controller; the MOD_DEF1 pin of the optical module is connected to the SCL pin of the controller; the MOD_DEF2 pin of the optical module is connected to the SDA pin of the controller. The first power supply can be a 3.3V power supply.

[0140] The second impedance unit includes: an eighth resistor and a first inductor; the first impedance unit includes: a second inductor.

[0141] One end of the first inductor is connected to the VccR pin, and the connection point is grounded through a first capacitor unit. The first capacitor unit includes two 0.1 μF capacitors connected in parallel. The inductance value of the first inductor can be 1 μH.

[0142] One end of the eighth resistor is connected to the first end of the optical drive protection circuit and the Tx Dis pin respectively; the other end of the eighth resistor is connected to one end of the second inductor; and the connection point between the eighth resistor and the second inductor is grounded through the fifth capacitor.

[0143] The resistance value of the eighth resistor may be 10KΩ, the inductance value of the second inductor may be 1 μH; and the capacitance value of the fifth capacitor may be 0.1 μF.

[0144] The other end of the second inductor is connected to the other end of the first inductor, and the connection point is respectively connected to one end of the second capacitor unit and the first power supply. The second capacitor unit includes a 0.1μF capacitor and a 10μF capacitor, which are connected in parallel.

[0145] The other end of the second capacitor unit is grounded.

[0146] The optical module includes: optical drive protection circuit (such as Figure 7 LED DRIVER & SAFETY CIRCUITRY shown), photoelectric conversion module (such as Figure 7 AMPLIFIER&QUANTIZATION) and control module (as shown Figure 7 CONTROLLER shown).

[0147] The photoelectric conversion module and the optical drive protection circuit are both connected to the optical fiber communication interface of the handheld host.

[0148] The optical drive protection circuit is used to convert the digital signal of the signal transceiver in the handheld host into an optical signal, and transmit the optical signal to another device; that is, to transmit the optical signal to the expansion device. The first end of the optical drive protection circuit is connected to the Tx Dis pin of the controller, and the connection point is connected to the first power supply through the second impedance unit. The handheld host and the expansion device are each regarded as a device.

[0149] A resistor is arranged between the positive and negative electrodes of the second end of the optical drive protection circuit. Specifically, one end of the resistor is connected to the positive electrode of the second end of the optical drive protection circuit, and the other end of the resistor is connected to the negative electrode of the second end of the optical drive protection circuit. The resistance value of the resistor may be 100Ω.

[0150] The positive electrode of the second end of the optical drive protection circuit is connected to the S0+ pin of the signal transceiver through the first capacitor; the positive electrode of the second end of the optical drive protection circuit is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the S0+ pin of the signal transceiver as the TD+ pin of the optical module; the negative electrode of the second end of the optical drive protection circuit is connected to the S0- pin of the signal transceiver through the second capacitor; the negative electrode of the second end of the optical drive protection circuit is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the S0- pin of the signal transceiver as the TD- pin of the optical module. The capacitance value of the first capacitor and the capacitance value of the second capacitor can be 0.1μF.

[0151] The photoelectric conversion module is used to receive an optical signal from another device, convert the optical signal into an electrical signal, and transmit the electrical signal to a signal transceiver in the same device, that is, the photoelectric conversion module receives an optical signal from the extension device, converts it into an electrical signal, and transmits the electrical signal to the signal transceiver of the handheld host. The positive electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the third capacitor and one end of the first resistor, and the second end of the third capacitor is used as the RD+ pin of the optical module, and is respectively connected to the S1+ pin of the signal transceiver, one end of the second resistor, and one end of the third resistor.

[0152] The negative electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the fourth capacitor and one end of the fourth resistor, and the second end of the fourth capacitor serves as the RD-pin of the optical module and is respectively connected to the Sl-pin of the signal transceiver, one end of the fifth resistor and one end of the sixth resistor.

[0153] The second end of the photoelectric conversion module is connected to the Rx_L0S pin of the controller as the RX_L0S pin of the optical module; and the connection point is connected to the first power supply through the seventh resistor.

[0154] The other end of the third resistor and the other end of the sixth resistor are both connected to the first power supply.

[0155] The other end of the first resistor, the other end of the second resistor, the other end of the fourth resistor and the other end of the fifth resistor are all grounded.

[0156] The capacitance value of the third capacitor and the capacitance value of the fourth capacitor may be 0.1 μF; the resistance value of the fourth resistor and the first resistor may be 150 KΩ; the resistance value of the third resistor and the sixth resistor may be 83 KΩ; the resistance value of the fifth resistor and the second resistor may be 130 KΩ. The resistance value of the seventh resistor may be 4.7 KΩ to 10 KΩ.

[0157] The three ends of the control module are connected to the SDA pin, SCL pin and MODULE pin of the controller respectively in one-to-one correspondence; the three connection points are connected to the first power supply through their corresponding resistors.

[0158] Specifically, the first end of the control module is connected to the MODULE pin of the controller as the MOD_DEF0 pin of the optical module; the connection point is connected to the first power supply through the ninth resistor; the second end of the control module is connected to the SCL pin of the controller as the MOD_DEF1 pin of the optical module; the connection point is connected to the first power supply through the tenth resistor. The third end of the control module is connected to the SDA pin of the controller as the MOD_DEF2 pin of the optical module; the connection point is connected to the first power supply through the eleventh resistor.

[0159] The resistance values ​​of the ninth resistor, the tenth resistor, and the eleventh resistor may be 4.7 KΩ to 10 KΩ.

[0160] The control module provides an I2C interface through which the FPGA reads some contents in the optical module status register, such as optical power, temperature, voltage, etc.

[0161] In practical applications, a signal relay can be used to switch between the RJ-45 network port and the Wi-Fi module network port. A digital switch can be used to switch between the communication serial ports of the 4G module and the Bluetooth module. The model of the touch LCD screen can be AUO: 10.4-inch LCD screen; matching touch screen + touch screen control board + customized screen cable + customized plexiglass structure; the synchronization module uses the LEA-M8T module: supports GPS and Beidou; 1 Gigabit optical SV / GOOSE transceiver: 88E1512; DAC (digital-to-analog converter) can be 16 bits, 16 channels (12 channels of which are configured as a maximum of 6U6I outputs, and 4 channels are voltage and current power supply outputs (DC)); high-speed isolation: 100Mbps; ADC (analog-to-digital converter) can be 12 bits, 16 channels (6 channels of which are 6I port voltages, requiring measurement of maximum and average values; 8 channels are voltage and current control power supplies and power supplies (DC); 2 channels are battery voltage and current (DC)); high-speed isolation: 25Mbps; the output quantity has 2 output on-offs, 1 output channel is fixed fast output, and the other output channel can be equipped with relay switch quantity or fast output quantity.

[0162] It should be noted that if Figure 8-Figure 11 shown. Figure 8 The front view of the expansion device. Fig. 9 This is a side view of the expansion module. Fig.10 This is the whole machine diagram of the expansion device. Fig.11 A cross-sectional view of the expansion device.

[0163] Optional, such as Fig.12 As shown, the expansion device includes at least one of an expansion current module and an expansion voltage module.

[0164] When the extension device includes an extension current module, the optical fiber communication interface of the extension current module is connected to the first optical fiber control interface of the handheld host; the output interface of the extension current module is connected to the second current interface of the device under test to provide current to the device under test.

[0165] The extended current module provides 6 channels of 20A current for the device under test.

[0166] When the extension device includes an extension voltage module, the optical fiber communication interface of the extension voltage module is connected to the second optical fiber control interface of the handheld host; the output interface of the extension voltage module is connected to the second voltage interface of the device under test, for providing voltage to the device under test.

[0167] Specifically, the extended voltage module provides 6 120V voltages for the device under test.

[0168] Optionally, the extension device includes: a first optical transceiver module, a first analog-to-digital conversion module, a first digital-to-analog conversion module, a power amplifier and a first processing module.

[0169] The first end of the first optical transceiver module is connected to the optical fiber communication interface of the extension device for communicating with the handheld host.

[0170] The second end of the first optical transceiver module is connected to the communication end of the first processing module, and is used to receive the signal of the first processing module and convert the signal of the handheld host and transmit it to the first processing module.

[0171] The output end of the first processing module is connected to the input end of the first digital-to-analog conversion module. The input end of the first processing module is connected to the output end of the first analog-to-digital conversion module. The input end of the first analog-to-digital conversion module is connected to the first end of the power amplifier. The output end of the first digital-to-analog conversion module is connected to the second end of the power amplifier. The output end of the power amplifier serves as the output end of the expansion device.

[0172] That is, the first processing module can output an electrical signal to the device under test through the first digital-to-analog conversion module and the power amplifier, and can also collect the electrical signal output by the power amplifier and feed it back to the first processing module through the first analog-to-digital conversion module, and then the first processing module performs corresponding control according to the feedback electrical signal.

[0173] The expansion device may also include a data storage device and a temperature sensor, and both the data storage device and the temperature sensor are controlled by the first processing module.

[0174] When the extension device includes an extension current module, the power amplifier includes a first current amplifier; when the extension device includes an extension voltage module, the power amplifier includes a first voltage amplifier.

[0175] Optionally, the first analog-to-digital conversion module includes: a first isolator and a first analog-to-digital converter; the input end of the first analog-to-digital converter serves as the input end of the first analog-to-digital conversion module; the output end of the first analog-to-digital converter is connected to the first end of the first isolator, and the second end of the first isolator serves as the output end of the first analog-to-digital conversion module.

[0176] The first digital-to-analog conversion module includes a second isolator and a first digital-to-analog converter; the first end of the second isolator serves as the input end of the first digital-to-analog conversion module; the second end of the second isolator is connected to the input end of the first digital-to-analog converter, and the output end of the first digital-to-analog converter serves as the output end of the first digital-to-analog conversion module.

[0177] The power amplifier is mainly composed of a high-speed differential amplifier, a power amplifier module (current amplifier or voltage amplifier), a distortion detection and reporting circuit, a protection circuit, an air cooling system and other structures. Its specific working principle is: the weak voltage / current signal enters the power amplifier module through the input end of the high-speed differential amplifier, and after a series of signal processing such as the preamplifier, driver amplifier, final power amplifier and filter circuit in the power amplifier module, the final voltage is converted into 0-120V AC voltage and the current is converted into 0-10A AC current and output through the power output port. In the power amplifier control part, the negative feedback control principle is introduced, and the protection circuit, distortion detection alarm circuit and other circuits are used to detect the operating status of the power amplifier in real time. When an abnormality is detected, the normal operation of the power amplifier is stopped immediately and its output is stopped. At the same time, the air cooling system uses a temperature sensor to detect the operating temperature of the relevant control circuit and chip, and adjusts the power output of the air cooling system in real time according to the operating temperature of the power amplifier.

[0178] Optional, such as Figure 7 As shown, the optical transceiver module in the extension device includes: an optical module (such as Figure 7 The processing module of the handheld host includes a controller (such as HFBR-57E5APZ shown in FIG. Figure 7 PROTOCOL) and signal transceiver (such as Figure 7 SerDes shown).

[0179] The VccR pin of the optical module is connected to the first power supply through the first impedance unit; the TX_GND pin of the optical module is grounded; the RX_GND pin of the optical module is grounded; the VccT pin of the optical module is connected to the first power supply through the corresponding resistor; the TD+ pin of the optical module is connected to the S0+ pin of the signal transceiver; the TD- pin of the optical module is connected to the S0- pin of the signal transceiver; the RD+ pin of the optical module is linked to the S1+ pin of the signal transceiver; the RD- pin of the optical module is linked to the S1- pin of the signal transceiver; the RX_L0S pin of the optical module is connected to the Rx_L0S of the controller; the MOD_DEF0 pin of the optical module is connected to the MODULE pin of the controller; the MOD_DEF1 pin of the optical module is connected to the SCL pin of the controller; the MOD_DEF2 pin of the optical module is connected to the SDA pin of the controller. The first power supply can be a 3.3V power supply.

[0180] The second impedance unit includes: an eighth resistor and a first inductor; the first impedance unit includes: a second inductor.

[0181] One end of the first inductor is connected to the VccR pin, and the connection point is grounded through a first capacitor unit. The first capacitor unit includes two 0.1 μF capacitors connected in parallel. The inductance value of the first inductor can be 1 μH.

[0182] One end of the eighth resistor is connected to the first end of the optical drive protection circuit and the Tx Dis pin respectively; the other end of the eighth resistor is connected to one end of the second inductor; and the connection point between the eighth resistor and the second inductor is grounded through the fifth capacitor.

[0183] The resistance value of the eighth resistor may be 10KΩ, the inductance value of the second inductor may be 1 μH; and the capacitance value of the fifth capacitor may be 0.1 μF.

[0184] The other end of the second inductor is connected to the other end of the first inductor, and the connection point is respectively connected to one end of the second capacitor unit and the first power supply. The second capacitor unit includes a 0.1μF capacitor and a 10μF capacitor, which are connected in parallel.

[0185] The other end of the second capacitor unit is grounded.

[0186] Optical modules include: Figure 7 LED DRIVER & SAFETY CIRCUITRY shown), photoelectric conversion module (such as Figure 7 AMPLIFIER&QUANTIZATION) and control module (as shown Figure 7 CONTROLLER shown).

[0187] The photoelectric conversion module and the optical drive protection circuit are both connected to the optical fiber communication interface of the extension module.

[0188] The optical drive protection circuit is used to convert the digital signal of the signal transceiver in the extension device into an optical signal, and transmit the optical signal to another device; that is, to transmit the optical signal to the handheld host. The first end of the optical drive protection circuit is connected to the Tx Dis pin of the controller, and the connection point is connected to the first power supply through the second impedance unit. The handheld host and the extension device are respectively regarded as a device.

[0189] A resistor is arranged between the positive and negative electrodes of the second end of the optical drive protection circuit. Specifically, one end of the resistor is connected to the positive electrode of the second end of the optical drive protection circuit, and the other end of the resistor is connected to the negative electrode of the second end of the optical drive protection circuit. The resistance value of the resistor may be 100Ω.

[0190] The positive electrode of the second end of the optical drive protection circuit is connected to the S0+ pin of the signal transceiver through the first capacitor; the positive electrode of the second end of the optical drive protection circuit is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the S0+ pin of the signal transceiver as the TD+ pin of the optical module; the negative electrode of the second end of the optical drive protection circuit is connected to the S0- pin of the signal transceiver through the second capacitor; the negative electrode of the second end of the optical drive protection circuit is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the S0- pin of the signal transceiver as the TD- pin of the optical module. The capacitance value of the first capacitor and the capacitance value of the second capacitor can be 0.1μF.

[0191] The photoelectric conversion module is used to receive an optical signal from another device, convert the optical signal into an electrical signal and transmit it to a signal transceiver in the same device; that is, the photoelectric conversion module receives an optical signal from a handheld host, converts it into an electrical signal, and transmits the electrical signal to a signal transceiver in the expansion device. The positive electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the third capacitor and one end of the first resistor, and the second end of the third capacitor is used as the RD+ pin of the optical module, and is respectively connected to the Sl+ pin of the signal transceiver, one end of the second resistor, and one end of the third resistor.

[0192] The negative electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the fourth capacitor and one end of the fourth resistor, and the second end of the fourth capacitor serves as the RD-pin of the optical module and is respectively connected to the Sl-pin of the signal transceiver, one end of the fifth resistor and one end of the sixth resistor.

[0193] The second end of the photoelectric conversion module is connected to the Rx_L0S pin of the controller as the RX_L0S pin of the optical module; and the connection point is connected to the first power supply through the seventh resistor.

[0194] The other end of the third resistor and the other end of the sixth resistor are both connected to the first power supply.

[0195] The other end of the first resistor, the other end of the second resistor, the other end of the fourth resistor and the other end of the fifth resistor are all grounded.

[0196] The capacitance value of the third capacitor and the capacitance value of the fourth capacitor may be 0.1 μF; the resistance value of the fourth resistor and the first resistor may be 150 KΩ; the resistance value of the third resistor and the sixth resistor may be 83 KΩ; the resistance value of the fifth resistor and the second resistor may be 130 KΩ. The resistance value of the seventh resistor may be 4.7 KΩ to 10 KΩ.

[0197] The three ends of the control module are connected to the SDA pin, SCL pin and MODULE pin of the controller respectively in one-to-one correspondence; the three connection points are connected to the first power supply through their corresponding resistors.

[0198] Specifically, the first end of the control module is connected to the MODULE pin of the controller as the MOD_DEF0 pin of the optical module; the connection point is connected to the first power supply through the ninth resistor; the second end of the control module is connected to the SCL pin of the controller as the MOD_DEF1 pin of the optical module; the connection point is connected to the first power supply through the tenth resistor. The third end of the control module is connected to the SDA pin of the controller as the MOD_DEF2 pin of the optical module; the connection point is connected to the first power supply through the eleventh resistor.

[0199] The resistance values ​​of the ninth resistor, the tenth resistor, and the eleventh resistor may be 4.7 KΩ to 10 KΩ.

[0200] It should be noted that the optical transceiver module and the processing module of the handheld host and the extension device are independent of each other.

[0201] It should be noted that the expansion device also includes a power supply module, the main functions of which include: converting the power input into the working power supply of other plug-ins through AC / DC conversion; power input protection and alarm; and grid synchronization detection.

[0202] The expansion device uses AC / DC conversion for power supply, which converts the mains power into two sets of high-power DC power supplies. One set is a +12V working power supply, and the other is a ±360V power supply; the ±360V power supply powers the power amplifier. The +12V working power supply is output to each functional plug-in through the backplane. Most plug-in power supplies use isolated DC / DC modules to power the plug-in's own circuits. The design margin of each part is better than 1 / 3. This distributed power supply method greatly improves the reliability of system integration and supports the modular design of circuits.

[0203] A power plug-in may also be provided to provide electrical power to the positive pole of the whole machine expansion device.

[0204] The expansion device is connected to the handheld host through an optical fiber cable, receives the control command sent by the handheld host ARM, and after processing by ARM logical operation, transmits the output command to the first current amplifier and the first voltage amplifier through FPGA. Each device realizes synchronous output of sampling signals through its own FPGA controller.

[0205] In this embodiment, the handheld host changes the second optical transceiver module connected to the extension device, and also adds a corresponding first optical transceiver module in the extension device; the traditional power amplifier device does not have the application of optical transceiver module, but only has a small signal acquisition interface. Conventional relay protection testers provide data to the power module through the backplane bus.

[0206] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0207] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0208] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An expandable handheld analog quantity test device, characterized in that: include: Handheld host and expansion device; The handheld host and the expansion device are independent of each other; The voltage interface of the handheld host is connected to the first voltage interface of the device under test, and is used to provide voltage to the device under test; The current interface of the handheld host is connected to the first current interface of the device under test, and is used to provide current to the device under test; The switch quantity interface of the handheld host is connected to the switch quantity interface of the device under test, and is used to collect the switch quantity signal of the device under test; The optical fiber communication interface of the handheld host is connected to the optical fiber communication interface of the extension device; The output interface of the extension device is connected to the power supply interface of the device under test, and is used to provide voltage and / or current to the device under test.

2. The expandable handheld analog quantity testing device according to claim 1, characterized in that: The expansion device includes at least one of an expansion current module and an expansion voltage module; When the extension device includes an extension current module, the optical fiber communication interface of the extension current module is connected to the first optical fiber control interface of the handheld host; the output interface of the extension current module is connected to the second current interface of the device under test, so as to provide current to the device under test; When the extension device includes an extension voltage module, the optical fiber communication interface of the extension voltage module is connected to the second optical fiber control interface of the handheld host; the output interface of the extension voltage module is connected to the second voltage interface of the device under test, so as to provide voltage to the device under test.

3. The expandable handheld analog quantity testing device according to claim 1, characterized in that: The expansion device comprises: a first optical transceiver module, a first analog-to-digital conversion module, a first digital-to-analog conversion module, a power amplifier and a first processing module; The first end of the first optical transceiver module is connected to the optical fiber communication interface of the extension device; The second end of the first optical transceiver module is connected to the communication end of the first processing module; The output end of the first processing module is connected to the input end of the first digital-to-analog conversion module; The input end of the first processing module is connected to the output end of the first analog-to-digital conversion module; An input end of the first analog-to-digital conversion module is connected to a first end of the power amplifier; The output end of the first digital-to-analog conversion module is connected to the second end of the power amplifier; The output end of the power amplifier serves as the output end of the expansion device.

4. The expandable handheld analog quantity testing device according to claim 3, characterized in that: When the extension device includes an extension current module, the power amplifier includes a first current amplifier; When the extension device comprises an extension voltage module, the power amplifier comprises a first voltage amplifier.

5. The expandable handheld analog quantity testing device according to claim 3, characterized in that: The first analog-to-digital conversion module includes: a first isolator and a first analog-to-digital converter; the input end of the first analog-to-digital converter serves as the input end of the first analog-to-digital conversion module; the output end of the first analog-to-digital converter is connected to the first end of the first isolator, and the second end of the first isolator serves as the output end of the first analog-to-digital conversion module; The first digital-to-analog conversion module includes a second isolator and a first digital-to-analog converter; the first end of the second isolator serves as the input end of the first digital-to-analog conversion module; the second end of the second isolator is connected to the input end of the first digital-to-analog converter, and the output end of the first digital-to-analog converter serves as the output end of the first digital-to-analog conversion module.

6. The expandable handheld analog quantity testing device according to claim 1, characterized in that: The handheld host comprises: an optical coupling module, a second processing module, a second digital-to-analog conversion module, a second current amplifier, a second voltage amplifier, a detection bridge module and a second optical transceiver module; The first end of the second optical transceiver module is connected to the transceiver end of the second processing module; the other end of the second optical transceiver module is connected to the optical fiber communication interface of the handheld host; The first end of the second processing module is respectively connected to the input end of the second digital-to-analog conversion module, the output end of the detection bridge module and the switch output interface of the handheld host through the optical coupling module; The output end of the second digital-to-analog conversion module is connected to the input end of the second voltage amplifier and the input end of the second current amplifier respectively; The output end of the second current amplifier is connected to the current interface of the handheld host; The output end of the second voltage amplifier is connected to the voltage interface of the handheld host; The input end of the detection bridge module is connected to the switch input interface of the handheld host.

7. The expandable handheld analog quantity testing device according to claim 6, characterized in that: The handheld host also includes: a second analog-to-digital conversion module, a power channel switching and charging management module, a current and voltage adjustment module, a touch LCD screen, a GPS module, a buzzer, an indicator light and a fan; The fan is connected to the second processing module via the optical coupling module; The power channel switching and charging management module is used to provide power to various devices in the handheld host; The indicator light, the buzzer, the touch LCD screen and the GPS module are all connected to the second processing module; The input end of the second analog-to-digital conversion module is respectively connected to the second current amplifier, the current and voltage adjustment module and the power channel switching and charging management module; The output end of the second analog-to-digital conversion module is connected to the second processing module through the optical coupling module; The input end of the current and voltage adjustment module receives the control division signal of the second processing module through the second digital-to-analog conversion module.

8. The expandable handheld analog quantity testing device according to claim 1, characterized in that: The handheld host and the extension device are respectively regarded as a device, and the optical transceiver modules in the two devices include: an optical module; the processing modules in the two devices include a controller and a signal transceiver; The VccR pin of the optical module is connected to the first power supply through the first impedance unit; the TX_GND pin of the optical module is grounded; and the RX_GND pin of the optical module is grounded; The optical module includes: an optical drive protection circuit, a photoelectric conversion module and a control module; The photoelectric conversion module and the optical drive protection circuit are both connected to the optical fiber communication interface of the device; The optical drive protection circuit is used to convert the digital signal of the signal transceiver in the same device into an optical signal, and transmit the optical signal to another device; the first end of the optical drive protection circuit is connected to the TxDis pin of the controller, and the connection point is connected to the first power supply through a second impedance unit; a resistor is set between the positive and negative electrodes of the second end of the optical drive protection circuit; the positive electrode of the second end of the optical drive protection circuit is connected to the S0+ pin of the signal transceiver through a first capacitor; the negative electrode of the second end of the optical drive protection circuit is connected to the S0- pin of the signal transceiver through a second capacitor; The photoelectric conversion module is used to receive an optical signal from another device, convert the optical signal into an electrical signal, and transmit the electrical signal to the signal transceiver in the same device; the positive electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the third capacitor and one end of the first resistor, and the second end of the third capacitor is respectively connected to the S1+ pin of the signal transceiver, one end of the second resistor and one end of the third resistor; the negative electrode of the first end of the photoelectric conversion module is respectively connected to the first end of the fourth capacitor and one end of the fourth resistor, and the second end of the fourth capacitor is respectively connected to the S1- pin of the signal transceiver, one end of the fifth resistor and one end of the sixth resistor; the second end of the photoelectric conversion module is connected to the Rx_L0S pin of the controller; the connection point is connected to the first power supply through the seventh resistor; the other end of the third resistor and the other end of the sixth resistor are both connected to the first power supply; the other end of the first resistor, the other end of the second resistor, the other end of the fourth resistor and the other end of the fifth resistor are all grounded; The three ends of the control module are connected to the SDA pin, SCL pin and MODULE pin of the controller respectively in a one-to-one correspondence; the three connection points are connected to the first power supply through their respective corresponding resistors.

9. The expandable handheld analog quantity testing device according to claim 8, characterized in that: The second impedance unit includes: an eighth resistor and a first inductor; the first impedance unit includes: a second inductor; One end of the first inductor is connected to the VccR pin, and the connection point is grounded through a first capacitor unit; One end of the eighth resistor is connected to the first end of the optical drive protection circuit and the Tx Dis pin respectively; the other end of the eighth resistor is connected to one end of the second inductor; the connection point between the eighth resistor and the second inductor is grounded through a fifth capacitor; The other end of the second inductor is connected to the other end of the first inductor, and the connection points are respectively connected to one end of the second capacitor unit and the first power supply; The other end of the second capacitor unit is grounded.

10. The expandable handheld analog quantity testing device according to claim 2, characterized in that: The handheld host provides four 120V voltages to the device under test through a first voltage interface; The handheld host provides three 10A currents to the device under test through a first current interface; The extended voltage module provides 6 120V voltages for the device under test; The extended current module provides six 20A currents for the device under test.

Images