The AC/DC instrument field standard source can be used to test and test AC/DC voltmeter, ammeter and single-phase, three-phase active power meter, reactive power meter, phase meter, power factor meter, frequency meter and other power frequency meters and power change. Sender. The system has the characteristics of small size, light weight and convenient operation, and is especially suitable for field use. At the same time, the system has the advantages of high functionality and high accuracy, and is also suitable for laboratory use. The system is cost-effective, multi-functional, and the market prospects are very promising.
(1) Multi-function, high accuracy, high power, can be widely used to verify various power frequency meters.
(2) The output voltage, current, phase, power factor, frequency, etc. are all started by software, and the range can be switched automatically or manually, which has little impact on the load.
(3) Voltage, current, phase, power factor, frequency, etc. can be adjusted bit by bit, continuous stepping, and full scale and clear key, easy to use.
(4) It has the functions of overcurrent, overvoltage automatic protection and automatic reset.
(5) 320X240LDC large screen display, can display the output voltage, current, phase, power factor, frequency and other parameters at the same time, and can display the relative error and absolute error of the adjusted value.
(6) With external calibration function, it can maintain the accuracy after calibration.
2 technical indicators(1) Output frequency range: 40.00~65.00Hz, accuracy ±0.02%, adjustment fineness: 0.01Hz.
(2) Output AC voltage range: A phase 15~660V, divided into four ranges of 150V, 250V, 400V, 600V; B and C phases are 15~440V. It is divided into three ranges of 150V, 250V and 400V.
(3) Output DC voltage range: 10mV~660V, divided into eight ranges of 75mV, 200mV, 2V, 10V, 150V, 250V, 400V, 600V.
(4) Output AC current range: 50mA~33A, divided into four ranges of 500mA, 1A, 5A, and 30A.
(5) Output DC current range: 5mA~22A, divided into 20μA, 200μA, 2mA, 20mA, 500mA, 1A, 5A, 20A eight ranges.
(6) Output AC and DC voltage, current adjustment fineness, better than 1 & TImes; 10-5, six digits bit by bit adjustment, each range can be adjusted between 0~110%.
(7) AC voltage and current phase shift range: 0.00 ~ 359.99 °, adjustment fineness 0.01 °, accuracy ± 0.05 °.
(8) AC voltage, current, power (PF = 1) accuracy: 0.05%.
(9) DC voltage accuracy: 0.02%.
(10) DC current 5A~20mA; range accuracy: 0.02%; other range accuracy: 0.05%.
(11) AC voltage, current output rated power: 30W.
(12) Measurement time range: 1ms~100s, accuracy: ±0.1ms.
(13) It is possible to add 2~20 harmonics. The amplitude is 0~30% of the fundamental wave.
Figure 1 AC and DC instrument field standard source DC schematic
Figure 2 voltage amplitude control principle
3 working principleThe principle of the DC part of this instrument is shown in Figure 1. The AC part is shown in Figure 3. The following is the analysis of the AC amplitude control principle, AC phase control principle, DC voltage control principle and DC current amplitude control principle.
3.1 AC amplitude control principle
Figure 3 AC and DC instrument field standard source AC schematic
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