Telemetering output impedance testing device

Abstract

The utility model provides a telemetering output impedance testing device, which comprises a telemetering terminal interface module, an impedance testing module, a data acquisition module, a relay change-over switch module, a main control module, a power supply module and an upper computer, and is characterized in that the power supply module is electrically connected with the data acquisition module, the relay change-over switch module and the main control module respectively; a plurality of test resistors are arranged in the impedance test module, a DUT (Device Under Test) and the test resistors in the impedance test module form a series loop through the telemetering terminal interface module, and the data acquisition module is used for acquiring a resistance signal of the impedance test module and transmitting the resistance signal to the main control module; the signal output end of the main control module is connected with the relay change-over switch module, and the main control module is used for controlling the on-off of a test resistor in the impedance test module through the relay change-over switch module; according to the application, gating of different test channels can be realized, so that conduction and isolation of analog signals are realized, and acquisition of multiple paths of telemetry signals is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical testing, in particular to a remote sensing output impedance testing device. Background Art

[0002] Telemetry output impedance is an important indicator in the assessment of aerospace stand-alone products. It is used to assess the interface matching between the individual units in the system and the characteristics of the telemetry circuit after the unit is powered on. A small telemetry output impedance indicates that the telemetry circuit has small losses and voltage drops, effectively ensuring that the collected analog telemetry signal meets the level requirements of the telemetry signal and that the impedance matching between the units is good.

[0003] The characteristics of the electrical interfaces of aerospace products are miniaturization, an increase in the number of internal contacts, and relatively concentrated electrical contacts of various types. The traditional test method for telemetry output impedance is to use telemetry signal acquisition equipment and impedance boxes to measure by connecting resistors of different resistance values ​​in parallel each time. This method requires many plugging and unplugging times, is inefficient, has a long test cycle, and is prone to errors due to human factors. The number of telemetry signal paths varies for different types of products. For example, the telemetry signals of power amplifier products generally reach 10 or more paths. Testing the telemetry output impedance requires frequent manual line changes, which not only brings a huge workload to the product's electrical performance testing and low test efficiency, but also increases the potential risks of dynamic impedance testing due to frequent plugging and unplugging. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a remote sensing output impedance test device, which is used to solve at least one problem in the prior related technology that the system test is frequently plugged in and out, has a large workload and low test efficiency.

[0005] The utility model is realized by the following technical solutions:

[0006] A telemetry output impedance test device comprises a telemetry terminal interface module, an impedance test module, a data acquisition module, a relay switching module, a main control module, a power supply module and a host computer, wherein the power supply module is electrically connected to the data acquisition module, the relay switching module and the main control module respectively, a plurality of test resistors are arranged in the impedance test module, and a DUT is connected to the test resistors in the impedance test module through the telemetry terminal interface module to form a series circuit, the data acquisition module is used to collect the resistance signal of the impedance test module and transmit the resistance signal to the main control module; the signal output end of the main control module is connected to the relay switching module, and the main control module is used to control the on and off of the test resistors in the impedance test module through the relay switching module.

[0007] Furthermore, the relay switching switch module includes a relay switch matrix and a relay driving submodule, and the relay switch matrix is ​​electrically connected to the telemetry terminal interface module and the impedance testing module respectively; the main control module drives the relay switch matrix to be turned on and off through the relay driving submodule.

[0008] Furthermore, the main control module is an STM32 series single-chip microcomputer.

[0009] Furthermore, the relay driver submodule is ULN2803.

[0010] Furthermore, the data acquisition module is an AD7606 analog-to-digital converter.

[0011] Furthermore, the test resistance values ​​of the impedance testing module are 100Ω, 500Ω, 1kΩ, 5kΩ, 10kΩ, 50kΩ, 100kΩ, 500kΩ and 1MΩ.

[0012] Furthermore, it also includes a communication module, which includes a serial port communication module and a network interface module.

[0013] Furthermore, the serial communication module is an RS232 connector.

[0014] Furthermore, the network interface module is an RJ45 connector.

[0015] Furthermore, the power supply module outputs linear regulated DC voltages of 5V and 3.3V.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] The utility model provides a remote sensing output impedance test device, comprising a remote sensing terminal interface module, an impedance test module, a data acquisition module, a relay switching module, a main control module, a power supply module and a host computer, wherein the power supply module is electrically connected to the data acquisition module, the relay switching module and the main control module respectively, a plurality of test resistors are arranged in the impedance test module, a DUT to be tested forms a series circuit with the test resistors in the impedance test module respectively through the remote sensing terminal interface module, the data acquisition module is used to collect the resistance signal of the impedance test module, and transmit the resistance signal to the main control module; the signal output end of the main control module is connected to the relay switching module, and the main control module is used to transmit the resistance signal to the main control module through the relay switching module. The electrical switching switch module controls the on and off of the test resistor in the impedance testing module; the present application automatically switches the on and off of the relay through the single-chip microcomputer, and selects different test resistors to realize the selection of different test channels, thereby realizing the conduction and isolation of analog signals and the collection of multi-channel telemetry signals. The single-chip microcomputer can traverse all resistance values ​​and match them according to the maximum power transfer theorem, that is, the value of the series resistor is matched with the value of the internal impedance with the smallest difference, and automatically selects the series resistor with the appropriate resistance value, thereby improving the measurement accuracy, completing the automatic testing of multi-channel telemetry impedance, reducing the number of manual plugging and unplugging times, avoiding quality risks caused by human errors, shortening the test cycle, and improving the safety and efficiency of the test work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural block diagram of a remote sensing output impedance test device of the utility model;

[0019] Figure 2 The utility model is a test principle block diagram of a remote sensing output impedance test device. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, 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 only 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 should fall within the scope of protection of the utility model.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, products or devices.

[0023] This embodiment provides a remote sensing output impedance test device, such as Figure 1 As shown, it includes a telemetry terminal interface module, an impedance test module, a data acquisition module, a relay switching switch module, a main control module, a power supply module and a host computer. The power supply module is electrically connected to the data acquisition module, the relay switching switch module and the main control module respectively. A plurality of test resistors are arranged in the impedance test module. The DUT forms a series circuit with the test resistors in the impedance test module through the telemetry terminal interface module respectively. The data acquisition module is used to collect the resistance signal of the impedance test module and transmit the resistance signal to the main control module; the signal output end of the main control module is connected to the relay switching switch module, and the main control module is used to control the on and off of the test resistors in the impedance test module through the relay switching switch module.

[0024] Preferably, in the present embodiment, the relay switching switch module comprises a relay switch matrix and a relay driving submodule, and the relay switch matrix is ​​electrically connected to the telemetry terminal interface module and the impedance testing module respectively; the main control module drives the on and off of the relay switch matrix through the relay driving submodule.

[0025] Furthermore, the main control module is an STM32 series single-chip microcomputer, the relay driver submodule is ULN2803, and the data acquisition module is an AD7606 analog-to-digital converter.

[0026] In this embodiment, the test resistors of the impedance test module have resistance values ​​of 100Ω, 500Ω, 1kΩ, 5kΩ, 10kΩ, 50kΩ, 100kΩ, 500kΩ and 1MΩ. The test resistors form an impedance box. Each test resistor is connected in series to the test loop. The test principle block diagram is shown in FIG. Figure 2 shown.

[0027] The main control module described in the embodiment of the present disclosure uses an STM32 chip based on the ARM Cortex core as the main control chip processor, and a further preferred chip is the STM32F407ZGT6 with a Cortex-M4 core.

[0028] The data acquisition module is used to collect the analog telemetry resistance signal, and convert the analog value of the resistance signal into a digital value and transmit it to the control chip of the main control module. The preferred chip for the data acquisition module is AD7606, which is an eight-channel, bipolar input, synchronous sampling 16-bit ADC with a built-in 2.5V reference voltage.

[0029] The utility model adopts external power supply, and the power supply module includes a power supply filter, a switching power supply and an electrolytic capacitor; 220V AC power enters the switching power supply through the power supply filter to generate a 12V DC power supply. Considering the influence of power supply ripple, electrolytic capacitors can be connected to both ends of the switching power supply output, and the 12V DC power supply generates 5V and 3.3V DC power respectively through linear regulators LM7805 and AMS1117-3.3, which are used to power the internal circuit of the test device; the main control chip STM32F407ZGT6 has a power supply voltage of 1.8V to 3.6V. It is estimated that the current required by the 3.3V system is about 700mA, so the AMS1117-3.3 with a maximum output current of 1.5A is selected as the voltage conversion chip.

[0030] In this embodiment, a communication module is also included, and the communication module includes a serial communication module and a network interface module. Specifically, the serial communication module is an RS232 connector, and the network interface module is an RJ45 connector. The power module outputs 5V and 3.3V linear regulated DC voltages.

[0031] Specifically, in the disclosed embodiment, the serial communication module is preferably an RS232 connector. If the main control chip uses the RS232 interface, it must go through a logic level conversion circuit and use a MAX3232 chip. The MAX3232 can convert the logic signal level of the microcontroller into the RS232 level. The MAX3232 chip has an internal electrostatic protection circuit that can effectively suppress electrostatic voltage and protect the device from electrostatic damage. It includes two independent RS232 level conversion channels: a data transmission rate of not less than 250kbps; low power consumption, a static current of 300µA, and only four 0.1µF small capacitors are needed to obtain twice the positive and negative voltages for matching the RS232 logic level.

[0032] The network interface module comprises an RJ45 connector and adopts a DP83848 chip. The RMII modes RMII_MOC, RMII_RXDO and RMII_RXD1 of the DP83848 chip are respectively connected to the RMII_MCD, RMII_RXDO and RMII_RXD1 pins of the STM32F407ZGT6.

[0033] The main control chip is the core component of the main control module and the central component that controls the operation of each module inside the automated test device. The data acquisition module is used to collect analog telemetry signals; the relay switching module is mainly used to select the test resistance value and select different test channels; the communication module is mainly used for the transmission of test data. After the test device is completed, the collected telemetry data is synchronously transmitted to the host computer, completing the automatic test of the telemetry output impedance and improving the test efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A remote sensing output impedance test device, characterized in that: It includes a telemetry terminal interface module, an impedance test module, a data acquisition module, a relay switching module, a main control module, a power supply module and a host computer. The power supply module is electrically connected to the data acquisition module, the relay switching module and the main control module respectively. A plurality of test resistors are arranged in the impedance test module. The DUT forms a series circuit with the test resistors in the impedance test module through the telemetry terminal interface module. The data acquisition module is used to collect the resistance signal of the impedance test module and transmit the resistance signal to the main control module. The signal output end of the main control module is connected to the relay switching module. The main control module is used to control the on and off of the test resistors in the impedance test module through the relay switching module.

2. A remote sensing output impedance test device according to claim 1, characterized in that: The relay switching module includes a relay switch matrix and a relay driving submodule. The relay switch matrix is ​​electrically connected to the telemetry terminal interface module and the impedance testing module respectively. The main control module drives the relay switch matrix to be turned on and off through the relay driving submodule.

3. A remote sensing output impedance test device according to claim 1, characterized in that: The main control module is an STM32 series single chip microcomputer.

4. A remote sensing output impedance test device according to claim 2, characterized in that: The relay driver module is ULN2803.

5. A remote sensing output impedance test device according to claim 1, characterized in that: The data acquisition module is an AD7606 analog-to-digital converter.

6. A remote sensing output impedance test device according to claim 1, characterized in that: The test resistance values ​​of the impedance testing module are 100Ω, 500Ω, 1kΩ, 5kΩ, 10kΩ, 50kΩ, 100kΩ, 500kΩ and 1MΩ.

7. A remote sensing output impedance test device according to claim 1, characterized in that: It also includes a communication module, which includes a serial port communication module and a network interface module.

8. A remote sensing output impedance test device according to claim 7, characterized in that: The serial communication module is an RS232 connector.

9. A remote sensing output impedance test device according to claim 7, characterized in that: The network interface module is an RJ45 connector.

10. The remote sensing output impedance test device according to claim 1, characterized in that: The power supply module outputs 5V and 3.3V linear regulated DC voltages.

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