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The test result of the systems sampling resistance detection circuit

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The test result of the systems sampling resistance detection circuit

Release date:2017-06-30 The author:毫欧电子 Click on:

The test results of the system verify the sampling resistance circuit. Refer to "JJG L66 93 dc resistor" verification regulation, volt ampere method is used to calibrate it to verify whether the accuracy of the multi-function calibration system meets the design specifications. The adjustable constant current source provides the test current, the range is 0~600 A, and the current converter and voltmeter together make up the current measurement standard. The composition of the whole calibration scheme test system

采样电阻


The sampling resistance error is the actual sampling resistance value under different test current at 75 m Omega, and its relative error is less than 0.003%. Table 4 shows the error of simulating different resistance values of high power resistance when the fixed test current is 100 A. It can be seen from the table that the relative error is within 0.004%. This is because the device system uses such as DC comparator, differential amplifier, sampling signal amplifier, D/A converter is a high linearity element, high linearity system. It is proved that the accuracy of the system analog output resistance can be within 0.02% range and meets the design requirements after several tests and tests under different values and current.

表3 75mΩ在不同输入电流时的误差

实际电流/A

29.9996

40.0001

50.0001

59.9999

70.0008

80.0006

89.9995

100.0019

实际电阻/mΩ

74.9996

74.9977

75.0002

75.0002

74.9997

74.9992

75.0016

75.0015

误差/%

-0.0005

-0.003

0.0003

0.0003

-0.0004

-0.0010

0.0021

0.0019


表4  100A测试电流下不同电阻值的误差

模拟电阻/mΩ

7.5

22.5

30.0

45.0

60.0

67.5

75.0

实际电阻/mΩ

7.5003

22.5001

30.0011

45.0009

60.0006

67.5001

75.0015

误差/%

0.004

0.0004

0.0037

0.002

0.001

0.0001

0.0019


The block diagram of the calibration device for the sampling resistance multifunction calibration system. Data analysis, multi-functional calibration system calibration device for the system to calibrate the measurement. Current measurement error: Table 1 is relative error at different current tests under 20 A range, and the relative error is less than 0.011%. Relative error of the relative error at different current tests for 100 A range is less than 0.01%。

      表1  20A量程下在不同电流测试时的误差

     实际电流/A

4.0000

6.0000

8.00009

10.00002

12.0000

14.00004

15.99999

18.00000

20.00015

     测量电流/A

3.9996

5.9996

7.9996

9.9996

11.9996

13.9996

15.9997

17.9997

20.0000

     误差

  /%

-0.0102

-0.0067

-0.0062

-0.0042

-0.0034

-0.0031

-0.0018

-0.0017

-0.0007


      表2  100A量程下在不同电流测试时的误差

      实际电流/A

29.9996

40.0001

50.0001

59.9999

70.0008

80.0006

89.9995

100.0019

      测量电流/A

29.998

39.998

49.999

59.999

69.999

79.998

89.999

100.001

      误差/%

-0.0054

-0.0052

-0.0022

-0.0014

-0.0026

-0.0033

-0.0006

-0.0009

  Conclusion the design of multifunctional sampling calibration system for resistance tester simulation resistor in the traditional current mode active innovation, using precision simulation technology and high resistance current measurement technology, and three types of instrument verification device with a wide range of resistance value can be set up, which can simulate the continuous 1U ~3.75 arbitrary resistance value, the resolution of 10N. And 0.02 grade accuracy; test current range, up to 600 A and 0.02 level accuracy, related technical indicators have reached the domestic leading level in the industry, to meet the requirements of three kinds of test instruments, verification has been widely used on resistance tester in the loop resistance tester, DC resistance tester and grounding to guide the。


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