Current parameter calibration system and method based on standard electromagnetic valve and oscilloscope

A technology of current parameter and calibration system, applied in instruments, measuring electrical variables, measuring devices, etc., can solve problems such as damage to special measuring equipment, and achieve the effect of simple structure, simple circuit structure, and accurate calibration results

Pending Publication Date: 2020-08-14
西安航天计量测试研究所
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AI-Extracted Technical Summary

Problems solved by technology

[0003] However, since the current measurement module of the special test equipment uses a MOS tube, if the direct calibratio...
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Abstract

The invention relates to a current parameter calibration system and method, and especially relates to a current parameter calibration system and method based on a standard electromagnetic valve and anoscilloscope. Accurate calibration of special test equipment is realized, after the equipment is powered on, the special test equipment, the standard electromagnetic valve, a sampling resistor and aprogrammable power supply form a closed loop, and the current on the sampling resistor is the current of the standard electromagnetic valve. The voltage at two ends of the sampling resistor is acquired through the oscilloscope to obtain a voltage curve; and according to the ohm law, a current curve is obtained through calculation, a steady-state current value, namely a standard current, is obtained through analysis, and calibration is achieved by comparing the steady-state current value with a measured current value.

Application Domain

Electrical measurements

Technology Topic

EngineeringElectromagnetic valve +7

Image

  • Current parameter calibration system and method based on standard electromagnetic valve and oscilloscope

Examples

  • Experimental program(1)

Example Embodiment

[0029] In the following, with reference to the accompanying drawings and specific embodiments, the specific embodiments of the present invention, such as the involved components, the mutual positions and connection relationships between the parts, the functions and working principles of the parts, will be further described in detail.
[0030] From figure 1 It can be seen that the current parameter calibration system based on standard solenoid valves and oscilloscopes in this embodiment mainly includes standard solenoid valves, sampling resistors, oscilloscopes, GPIB controllers, program-controlled power supplies, special calibration cables, computers, and host computer software. The special test equipment to be calibrated includes 50 sampling channels. The dedicated calibration cable is a multi-core cable, the number of cable cores corresponds to the number of sampling channels, and one of the cable cores is a common cable core.
[0031] The program-controlled power supply, the special test equipment to be calibrated, the calibration cable, the standard solenoid valve, and the sampling resistor are connected in turn to form a closed loop; the specific loop is: the positive end of the program-controlled power supply can be connected to one end of the dedicated calibration cable through the positive end of each sampling channel to be tested , The other end of the dedicated calibration cable can be connected to the standard solenoid valve, the standard solenoid valve is connected to one end of the sampling resistor, the other end of the sampling resistor is connected to one end of the common cable core, and the other end of the common cable core is connected to the negative end of each sampling channel , The negative terminal of each sampling channel is connected to the negative terminal of the programmable power supply.
[0032] The oscilloscope is connected in parallel at both ends of the sampling resistor to collect the voltage waveform at both ends of the sampling resistor;
[0033] GPIB controller is used to control the communication between the computer and the program-controlled power supply and the oscilloscope;
[0034] The computer is used to send control instructions to the program-controlled power supply and oscilloscope.
[0035] Send instructions to control the oscilloscope to initialize; send instructions to control the program-controlled power supply to output the required voltage, the voltage in this embodiment is 28V.
[0036] Control the oscilloscope to collect the voltage value at both ends of the sampling resistor, obtain the voltage curve corresponding to the corresponding target point, and save it;
[0037] Call the data processing program, process the obtained voltage curve, calculate the corresponding current curve according to Ohm's law; obtain its time information and standard current steady-state value according to the current curve analysis;
[0038] The steady-state value of the standard current is compared with the measured current value of the special test equipment to realize the calibration of the corresponding channel.
[0039] The special test equipment includes 50 sampling channels. Through the above-mentioned process, each is connected to a different sampling channel in the loop, and the calibration of the 50 channels is realized in turn, and finally the calibration of the special test equipment is realized.
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Description & Claims & Application Information

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