Phase Angle Voltmeter Vm-202BR (North Atlantic Industries)

摘要

The Phase Angle Voltmeter is tested for line voltage reggulation, accuracy, and frequency response. Regulation is tested by injecting an accurately known voltage, and obtaining a reference indication when the line voltage is 115 volts. The reference indication is again obtained with line voltages of 105 and 125 volts, and the input voltage is recorded. Accuracy is tested by obtaining exact Test Instrument indications, and recording the input voltages. Frequency response is tested on 3 ranges by direct comparison with an accurate EVM. The overload light is tested for illumination by injecting a signal 5 times greater than the RANGE switch setting. The reference sensitivity is tested by measuring the input voltage required to obtain a reference indication with the REF ADJ control adjusted for maximum gain. The phase-angle tests are performed by connecting the outputs of a phase shifter to the Test Instrument and a precision phasemeter. The phase shifter is adjusted to various phase angles as indicated by the Test Instrument, and the applied angle is measured with the precision phasemeter. Regulation is tested by performing a measurement, as previously described, at line voltages of 105 and 125 volts.