Calibration system of digital quantity input type electric energy meter
A technology of digital input and calibration system, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve problems such as the problem of calibration of digital input type electric energy meters.
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[0021] figure 1 It is a schematic structure diagram of the digital quantity input electric energy meter calibration device of the present invention. The present invention uses a control computer 1 to control an analog power source 2 to output analog voltage and current signals. The analog signal is divided into two routes, one of which is converted into a voltage signal meeting the input requirements of the AD sampling module by a high-precision PT3 and a high-precision CT4. The converted voltage signal is monitored by high-precision digital voltmeters 5 and 6 to calibrate the conversion results; another route is measured by an analog standard meter 10 for error comparison with the measured digital input watt-hour meter. The voltage signals output by PT and CT are sampled by the high-precision ADC and processed by the FPGA of the module. According to different working modes, the FPGA transmits the original sampling data to the protocol generation module 8 through the serial bu...
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