A tester for testing the measurement accuracy of a PMU device and a test method thereof
A technology for measuring accuracy and testing instruments, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., and can solve problems such as undiscovered
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Embodiment 1
[0028] like figure 1 As shown, the embodiment of the present invention one kind tester of measuring accuracy of PMU device, comprises processor module, two-channel D / A digital-to-analog conversion module, relay module, power amplifier module and decoder module, B code timing signal The clock synchronization signal is output from the decoder module to the processor module, and the processor module outputs a D / A control signal to control one channel of the two-channel D / A digital-to-analog conversion module to output a DC voltage signal, and the other channel to output an AC voltage signal. The processor module outputs a switch control signal to control the on or off of the relay, the DC voltage signal outputs an analog key phase pulse signal through the contact switch of the relay, and the power amplifier module includes a driving power amplifier and a switching power amplifier, so The AC voltage signal is respectively amplified by the driving power amplifier to output the volt...
Embodiment 2
[0036] like figure 2 As shown, the difference between the second embodiment of the present invention and the first embodiment is that the D / A digital-to-analog conversion module adopts a three-channel D / A digital-to-analog conversion module, and the processor module outputs a D / A control signal to control the three-channel D / A digital One channel of the analog-to-analog conversion module outputs a DC voltage signal, the other channel outputs an AC voltage signal, and the other channel outputs an AC voltage signal. One of the two AC voltage signals is amplified by the drive power amplifier to output the analog terminal voltage signal, and the other is converted to power The amplifier converts the AC current signal and outputs the analog terminal current signal.
[0037]The three-channel D / A digital-to-analog conversion module can also use the D / A digital-to-analog conversion chip of the model DAC7744. This chip contains four independent D / A digital-to-analog conversion channel...
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