A PMMC instrument with FSD of 100 µA and a coil resistance of 1kQ is to be converted into a voltmeter. Determine the required multiplier resistance if the voltmeter is to measure 50 V at full scale. Also, calculate the applied voltage when the instrument indicates 0.8, 0.5, and 0.2 of FSD.

A PMMC instrument with FSD of 100 µA and a coil resistance of 1kQ is to be converted into a voltmeter. Determine the required multiplier resistance if the voltmeter is to measure 50 V at full scale. Also, calculate the applied voltage when the instrument indicates 0.8, 0.5, and 0.2 of FSD.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter59: Motor Startup And Troubleshooting Basics

Section: Chapter Questions

Problem 12SQ: How is a solid-state diode tested? Explain.

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

A PMMC instrument with FSD of 100 µA and a coil
resistance of 1 kQ is to be converted
into a voltmeter. Determine the required multiplier
resistance if the voltmeter is to measure
50 V at full scale. Also, calculate the applied voltage when
the instrument indicates 0.8, 0.5,
and 0.2 of FSD.

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