Automatic calibration device for oscilloscope calibrator

Abstract

The utility model provides an automatic calibration device for an oscilloscope calibrator, and relates to the technical field of calibration devices. The device comprises a box body, a calibration system main body and a programmed control system, wherein the box body is composed of a front panel, a back panel, a bottom and side walls; the back panel is provided with a communication interface, a mains supply interface and a power switch; the front panel is provided with a signal test interface connected with a calibrated oscilloscope, a programmed switch state window, a reset key and an equipment switch; the calibration system main body comprises a programmed switch, a voltage measurement unit, a time scale measurement unit, a power measurement unit, a pulse measurement unit and a resistance and capacitance measurement unit; and the programmed switch is connected with the signal test interface of the front panel through a BNC wire in the box body. According to the device, automatic calibration of the oscilloscope calibrator can be realized, manual intervention is reduced to the greatest extent, the test efficiency is improved, and the device is compact in structure, convenient to operate and capable of meeting daily calibration requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of calibration devices, and particularly relates to an automatic calibration device for an oscilloscope calibrator. Background Art

[0002] With the continuous progress and development of technology, oscilloscopes are widely used in production and practice. Many enterprises and third-party calibration companies are equipped with oscilloscope calibrators for the metrological testing of oscilloscopes, so the metrological requirements for oscilloscope calibrators are increasing day by day.

[0003] Manually calibrating an oscilloscope calibrator requires multiple standard devices. The amount of test data is approximately 650. There are many calibration items and the operation is complex. It takes one day to completely inspect one unit. Relying on manual measurement cannot meet the increasing calibration requirements. At present, there is no realization of an automatic calibration system for oscilloscope calibrators on the market. Therefore, this application proposes an automatic calibration device for an oscilloscope calibrator to minimize manual intervention and improve test efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an automatic calibration device for an oscilloscope calibrator to solve the problem of automatic calibration of an oscilloscope calibrator in view of the above-mentioned deficiencies of the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides an automatic calibration device for an oscilloscope calibrator, which includes a box body, a calibration system main body and a program control system.

[0007] The box body is composed of a front panel, a back panel, a bottom and side walls, and is fixedly connected by screws.

[0008] The back panel is provided with a communication interface, a mains power supply interface and a power switch.

[0009] The front panel is provided with a signal test interface for connecting the oscilloscope calibrator to be tested, a program control switch status window, a reset key and a device switch. The connection line between the signal test interface and the oscilloscope calibrator to be tested is a BNC test line.

[0010] The calibration system main body includes a program control switch, a voltage measurement unit, a time scale measurement unit, a power measurement unit, a pulse measurement unit, a resistance and capacitance measurement unit. The program control switch, the voltage measurement unit, the time scale measurement unit, the power measurement unit, the pulse measurement unit, and the resistance and capacitance measurement unit are all embedded inside the box body and are connected in parallel through a GPIB bus. Finally, they are connected to the communication interface on the back panel of the box body through a GPIB to USB data transmission line. The communication interface on the back panel is connected to the program control system through a USB cable.

[0011] The programmable switch is connected to the signal test interface on the front panel through a BNC cable inside the box. When measuring voltage, time scale, power, pulse, and resistance-capacitance parameters, the programmable switch is connected to the voltage measurement unit, time scale measurement unit, power measurement unit, pulse measurement unit, and resistance-capacitance measurement unit through BNC test cables for testing.

[0012] Optionally, the communication interface on the back panel is a USB communication interface, and the mains power interface on the back panel is a wide-voltage mains power supply interface of 100V - 220V.

[0013] Optionally, the channel connection status of the programmable switch is displayed in the programmable switch status window on the front panel.

[0014] Optionally, there are circular heat dissipation holes on one side of the back panel, which are used to dissipate heat from the main board in the calibration system body.

[0015] Optionally, the maximum allowable errors of the oscilloscope calibrator automatic calibration device are as follows: DC voltage: ±1×10 -5 ; Pulse amplitude: ±4×10 -4 ; Time scale signal: ±1×10 -7 ; Rise time: Under the condition of k = 2, U = 8.0%; Sine wave: ±3.0%; Resistance: ±0.1%; Capacitance: ±0.8%.

[0016] Optionally, the voltage measurement unit is used to measure DC voltage and square wave voltage; the time scale measurement unit is used to measure time scale parameters; the power measurement unit is used to measure sine wave flatness; the pulse measurement unit is used to measure rise time; the resistance-capacitance measurement unit is used to measure resistance and capacitance parameters.

[0017] Optionally, the oscilloscope calibrator automatic calibration device can achieve the calibration of the oscilloscope calibrators of FLUKE's 9500B, 5520A, 5080A, and 5500A.

[0018] Optionally, the programmable system is installed in a computer, and the connection between the computer and the calibration system body is realized through a USB-GPIB cable.

[0019] The beneficial effects of the present utility model include:

[0020] The automatic calibration device for an oscilloscope calibrator provided by the present utility model includes a box body, a calibration system main body, and a program control system. The box body is composed of a front panel, a back panel, a bottom, and side walls, and is fixedly connected by screws; the back panel is provided with a communication interface, a mains power supply interface, and a power switch; the front panel is provided with a signal test interface for connecting the oscilloscope calibrator to be tested, a program control switch status window, a reset key, and a device switch. The connection line between the signal test interface and the oscilloscope calibrator to be tested is a BNC test line; the calibration system main body includes a program control switch, a voltage measurement unit, a time scale measurement unit, a power measurement unit, a pulse measurement unit, and a resistance-capacitance measurement unit. The program control switch, the voltage measurement unit, the time scale measurement unit, the power measurement unit, the pulse measurement unit, and the resistance-capacitance measurement unit are all embedded inside the box body and are connected in parallel through a GPIB bus. Finally, they are connected to the communication interface on the back panel of the box body through a GPIB-to-USB data transmission line. The communication interface on the back panel is connected to the program control system through a USB cable; the program control switch is connected to the signal test interface on the front panel through a BNC line inside the box body. When the program control switch measures parameters such as voltage, time scale, power, pulse, and resistance-capacitance, it is connected to the voltage measurement unit, the time scale measurement unit, the power measurement unit, the pulse measurement unit, and the resistance-capacitance measurement unit through a BNC test line for testing. This device can achieve automatic calibration of the oscilloscope calibrator, minimize manual intervention, improve the test efficiency, and has a compact structure and convenient operation, which can meet the daily calibration requirements. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Fig. shows a schematic diagram of the front panel of the box body of the automatic calibration device for an oscilloscope calibrator provided by the embodiment of the present utility model;

[0023] Figure 2 Fig. shows a schematic diagram of the main structure of the automatic calibration device for an oscilloscope calibrator provided by the embodiment of the present utility model;

[0024] Figure 3 Fig. shows a schematic diagram of the back panel of the box body of the automatic calibration device for an oscilloscope calibrator provided by the embodiment of the present utility model;

[0025] Figure 4 Fig. shows a schematic diagram of the calibration process of the automatic calibration device for an oscilloscope calibrator provided by the embodiment of the present utility model. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in a variety of different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0028] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Manually calibrating an oscilloscope calibrator requires multiple standard devices. The amount of test data is approximately 650. There are many calibration items and the operation is complex. It takes one day to completely test one unit. Relying on manual measurement cannot meet the increasing calibration requirements. Currently, there is no implementation of an automatic calibration system for oscilloscope calibrators on the market. Therefore, this application proposes an automatic calibration device for oscilloscope calibrators to minimize manual intervention and improve test efficiency.

[0032] Figure 1 Fig. shows a schematic diagram of the front panel of the box body of the automatic calibration device for an oscilloscope calibrator provided by an embodiment of the present invention; Figure 2 Fig. shows a schematic diagram of the main structure of the automatic calibration device for an oscilloscope calibrator provided by an embodiment of the present invention; Figure 3 Fig. shows a schematic diagram of the back panel of the box body of the automatic calibration device for an oscilloscope calibrator provided by an embodiment of the present invention; Figure 4 Fig. shows a schematic diagram of the calibration process of the automatic calibration device for an oscilloscope calibrator provided by an embodiment of the present invention.

[0033] Next, reference will be made to Figures 1 to 4 Describe the calibration device of the present application in detail.

[0034] As Figures 1 to 3 shown, the present invention provides an automatic calibration device for an oscilloscope calibrator. The device includes a box body 218, a calibration system main body, and a program control system 215.

[0035] The box body 218 is composed of a front panel, a back panel, a bottom, and side walls, and is fixedly connected by screws.

[0036] The back panel is provided with a communication interface 214, a mains power supply interface 216, and a power switch 217.

[0037] The front panel is provided with a signal test interface 101 for connecting the oscilloscope calibrator 212 to be tested, a program control switch status window 103, a reset key 102, and a device switch 104. The connection line between the signal test interface 101 and the oscilloscope calibrator 212 to be tested is a BNC test line.

[0038] The calibration system main body includes a programmable switch 213, a voltage measurement unit 205, a time scale measurement unit 206, a power measurement unit 207, a pulse measurement unit 208, and a resistance-capacitance measurement unit 209. The programmable switch 213, the voltage measurement unit 205, the time scale measurement unit 206, the power measurement unit 207, the pulse measurement unit 208, and the resistance-capacitance measurement unit 209 are all embedded inside the box body 218 and are connected in parallel through the GPIB bus. Finally, they are connected to the communication interface 214 on the back panel of the box body 218 through a GPIB-to-USB data transmission line, and the communication interface 214 on the back panel is connected to the programmable control system 215 through a USB cable. The specific circuit of each unit among the voltage measurement unit 205, the time scale measurement unit 206, the power measurement unit 207, the pulse measurement unit 208, and the resistance-capacitance measurement unit 209 can be realized by conventional technical means.

[0039] The programmable switch 213, the voltage measurement unit 205, the time scale measurement unit 206, the power measurement unit 207, the pulse measurement unit 208, and the resistance-capacitance measurement unit 209 are connected to the mains power supply interface 216 on the back panel through the device box body 218 and are powered through the power supply interface.

[0040] The data acquisition module of the communication interface 214 is connected to the voltage measurement unit 205, the time scale measurement unit 206, the power measurement unit 207, the pulse measurement unit 208, and the resistance-capacitance measurement unit 209 through the data bus and acquires the DC voltage, square wave voltage, time scale parameter, sine wave flatness, rise time, resistance, and capacitance parameters measured by each measurement unit.

[0041] The programmable switch 213 is connected to the signal test interface 101 on the front panel through a BNC cable inside the box body 218. When the programmable switch 213 measures voltage, time scale, power, pulse, and resistance-capacitance parameters, it is connected to the voltage measurement unit 205, the time scale measurement unit 206, the power measurement unit 207, the pulse measurement unit 208, and the resistance-capacitance measurement unit 209 through a BNC test cable for testing.

[0042] See Figure 2, the programmable switch 213 includes a controller 210, a relay 211, ports 0 to 5. Among them, port 0 is a signal test interface for connecting with the oscilloscope calibrator 212 to be tested (i.e., signal test interface 101), port 1 is the voltage measurement unit interface; port 2 is the time scale measurement unit interface; port 3 is the power measurement unit interface, port 4 is the pulse measurement unit interface; port 5 is the resistance and capacitance measurement unit interface. The working principle of the programmable switch 213: The programmable control system 215 controls the calibration system main body through the communication interface 214 to calibrate each signal of the oscilloscope calibrator 212 to be tested. For example, if the oscilloscope calibrator 212 is to be calibrated for DC voltage, through the internal switch logic switching of the electronic switch, the output channel of the oscilloscope calibrator 212 is connected to port 1 of the programmable switch 213 to form a single channel. By sending instructions, parameters are set for the oscilloscope calibrator 212 and the voltage measurement unit 215, and data is collected from the voltage measurement unit 215. Similarly, other parameter measurements of the oscilloscope calibrator 212 can also collect data from other measurement units using the corresponding principle.

[0043] During calibration, after the programmable control system completes the communication connection with the oscilloscope calibrator to be tested and the calibration system main body, it issues a start instruction, then sends a logic switching instruction to the programmable switch. Through the internal switching circuit of the programmable switch, the corresponding channel is displayed in the programmable switch status window on the front panel of the cabinet, and the output signal to be tested is output to the corresponding measurement unit. After that, the programmable control system collects the measurement signals of each measurement unit through the GPIB data cable, and the test data is displayed on the programmable control system.

[0044] This device can realize the automatic calibration of the oscilloscope calibrator, minimize manual intervention, improve the test efficiency. This device has a compact structure and is easy to operate, which can meet the daily calibration requirements.

[0045] Optionally, the communication interface 214 on the back panel is a USB communication interface, and the mains power interface 216 on the back panel is a wide-voltage mains power supply interface of 100V~220V.

[0046] Optionally, the channel connection status of the programmable switch 213 is displayed in the programmable switch status window 103 on the front panel.

[0047] Optionally, a circular heat dissipation hole is provided on one side of the back panel. The heat dissipation hole is used to dissipate heat from the main board in the calibration system main body, reducing the burden brought by the long-term operation of the calibration device. The power socket on the back panel is used to connect the power cord to supply working power to the calibration device.

[0048] Optionally, the maximum allowable error of the oscilloscope calibrator automatic calibration device is as follows: DC voltage: ±1×10 -5 ; Pulse amplitude: ±4×10-4 ; Time scale signal: ±1×10 -7 ; Rise time: Under the condition of k = 2, U = 8.0%; Sine wave: ±3.0%; Resistance: ±0.1%; Capacitance: ±0.8%.

[0049] Optionally, the voltage measurement unit 205 is used to measure DC voltage and square wave voltage; the time scale measurement unit 206 is used to measure time scale parameters; the power measurement unit 207 is used to measure sine wave flatness; the pulse measurement unit 208 is used to measure rise time; the resistance and capacitance measurement unit 209 is used to measure resistance and capacitance parameters.

[0050] Optionally, the oscilloscope calibrator automatic calibration device can achieve the calibration of the oscilloscope calibrators of FLUKE companies 9500B, 5520A, 5080A, and 5500A.

[0051] Optionally, the programmable control system 215 can be a computer, and the connection between the computer and the calibration system main body is realized through a USB-GPIB cable. The signal output of the oscilloscope calibrator under test and the calibration system main body and the reading of the measurement signal are controlled through instructions.

[0052] After the calibration is completed, the programmable control system 215 disconnects the signals of the oscilloscope calibrator under test and the calibration main body, and can print a test report in the form of EXCEL.

[0053] The measurement principles of specific parameters will be introduced below.

[0054] Such as Figure 2As shown in the figure, when performing voltage measurement, connect port 1 to the voltage measurement unit 205. The programmable control system 215 controls the output of the oscilloscope calibrator through the communication interface 214. By controlling the programmable switch 213, the test channel is switched to the voltage measurement module. The voltage measurement unit is used to measure the DC calibration voltage, square wave calibration voltage, amplitude of the amplitude-stabilized sine signal, and amplitude of the waveform generator of the oscilloscope calibrator to be tested, and the test data is collected through the programmable control system 215. When performing time scale measurement, by controlling the programmable switch 213, the test channel is switched to the time scale measurement unit 216. Connect port 2 to the time scale measurement unit 206. The programmable control system 215 controls the output of the oscilloscope calibrator. The time scale measurement unit 206 is used to measure the time scale of the oscilloscope calibrator to be tested, and the test data is collected through the programmable control system 215. When performing power measurement, by controlling the programmable switch 213, the test channel is switched to the power measurement unit 207. Connect port 3 to the power measurement unit 207. The programmable control system 215 controls the output of the oscilloscope calibrator. The power measurement unit is used to measure the sine wave flatness of the oscilloscope calibrator to be tested, and the test data is collected through the programmable control system 215. When performing pulse measurement, by controlling the programmable switch 213, the test channel is switched to the pulse measurement unit 208. Connect port 4 to the pulse measurement unit 208. Control the output of the oscilloscope calibrator. The pulse measurement unit 208 is used to measure the fast edge rise time, fast edge pulse duty cycle, and frequency of the oscilloscope calibrator to be tested, and the test data is collected through the programmable control system 215. When performing resistance and capacitance measurement, by controlling the programmable switch 213, the test channel is switched to the programmable resistance and capacitance measurement unit 209. The resistance and capacitance module is composed of a series of resistors and capacitors connected. Through the switch signal, the required resistance and capacitance are output to port 5. The programmable control system 215 controls the output of the oscilloscope calibrator. The programmable resistance and capacitance measurement unit 209 is used to test the impedance measurement function of the oscilloscope calibrator to be tested, and the test data is read from the oscilloscope calibrator to be tested.

[0055] The specific calibration process is as Figure 4 shown. At the beginning of calibration, connect the oscilloscope calibrator to be tested to the box through the signal test interface, input the GPIB address to be tested, and the programmable control system initializes the device. If the connection is successful, start selecting the calibration items. If not, report an error and re-initialize. After selecting the calibration items, click Start to perform the calibration of each item, automatically calculate the upper and lower limits, uncertainty, and judge whether it is qualified, and display the test results on the interface through the data acquisition module. If an exception occurs during the process, the calibration program reports an error and pauses. The data acquisition module saves the data results, and automatically generates an EXCEL report after all calibration items are completed. If you want to stop the calibration, you can press the Stop button, and the established communication connection will be automatically released.

[0056] In summary, the present application provides an automatic calibration device for an oscilloscope calibrator. This device minimizes manual intervention and improves test efficiency. The calibration device provided by the present application has met the test requirements of most oscilloscope calibrators currently on the market. It realizes automatic line switching through a programmable switch, eliminating the need for manual test line replacement and featuring high measurement accuracy. The present application can accurately read data, perform error calculation, and make pass / fail judgments. The test report of the calibration device provided by the present application is saved in EXCEL format, facilitating the acquisition of test data and the printing of test reports.

[0057] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic calibration device for an oscilloscope calibrator, characterized in that: The device comprises a box, a calibration system body and a program control system. The box body is composed of a front panel, a back panel, a bottom and side walls, and is fixed by screws; The back panel is provided with a communication interface, a mains power interface and a power switch; The front panel is provided with a signal test interface for connecting to the oscilloscope calibrator under test, a program-controlled switch status window, a reset button and a device switch, and the connection line between the signal test interface and the oscilloscope calibrator under test is a BNC test line; The calibration system body includes a program-controlled switch, a voltage measurement unit, a time-scale measurement unit, a power measurement unit, a pulse measurement unit, and a resistance and capacitance measurement unit. The program-controlled switch, the voltage measurement unit, the time-scale measurement unit, the power measurement unit, the pulse measurement unit, and the resistance and capacitance measurement unit are all embedded in the box and connected in parallel through a GPIB bus. Finally, the communication interface of the back panel of the box is connected through a GPIB to USB data transmission line. The communication interface of the back panel is connected to the program-controlled system through a USB line. The program-controlled switch is connected to the signal test interface of the front panel through a BNC line inside the box. When the program-controlled switch measures voltage, time scale, power, pulse and resistance and capacitance parameters, it is connected to the voltage measurement unit, time scale measurement unit, power measurement unit, pulse measurement unit and resistance and capacitance measurement unit through the BNC test line for testing.

2. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The communication interface of the back panel is a USB communication interface, and the mains power supply interface of the back panel is a 100V-220V wide voltage mains power supply interface.

3. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The channel connection status of the program-controlled switch is displayed in the program-controlled switch status window of the front panel.

4. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: A circular heat dissipation hole is provided on one side of the back panel, and the heat dissipation hole is used to dissipate heat from a mainboard in the calibration system body.

5. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The maximum permissible error of the automatic calibration device of the oscilloscope calibrator is as follows: DC voltage: ±1×10 -5 ; Pulse amplitude: ±4×10 -4 ; Time scale signal: ±1×10 -7 ; Rise time: Under k = 2 conditions, U = 8.0%; Sine wave: ±3.0%; Resistance: ±0.1%; Capacitance: ±0.8%.

6. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The voltage measurement unit is used to measure DC voltage and square wave voltage; the time scale measurement unit is used to measure time scale parameters; the power measurement unit is used to measure the flatness of the sine wave; the pulse measurement unit is used to measure the rise time; The resistance and capacitance measuring unit is used to measure resistance and capacitance parameters.

7. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The automatic calibration device for an oscilloscope calibrator can realize the calibration of 9500B, 5520A, 5080A and 5500A oscilloscope calibrators of FLUKE Company.

8. The automatic calibration device for an oscilloscope calibrator according to claim 1, characterized in that: The program control system is installed on a computer, and the connection between the computer and the calibration system body is achieved through a USB-GPIB line.

Images