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This paper reports a new design of power monitor system, which is mainly used in the area of isolation transformer power supply for precision measurement, medical equipments and electrical safety. The principle, structure and function of the system are described in detail.
Digital sampling measuring system was developed at NIM. AC signals under test were transmitted into the input of AD converter by voltage follower. Under the control of MCU, AD converter synchronously sampled the signal by full period, and the sampling data was transmitted by photo-coupler and calculated by computer. The sampling results compared with the measurement results of FLUKE 5790A. The agreements...
DC voltage was traced to DC voltage reference (FLUKE 732A) by the calibrated divider (datron 4902S). The divider supplied 18 fixed ratios to calibrate DC voltage from 10 mV to 1000 V. DC voltage traceability mainly depends on the DC voltage reference and DC voltage divider. The DCV reference is traced to JJAVS twice a year, with the uncertainty of 1 times 10-7 (k=l). After calibration, the uncertainty...
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