# Measurements

### Explanation of question 13

A moving coil instrument, connected via a bridge rectifier, can be used to measure the voltage of a

1. waveform of any shape up to about 1MHz
2. sinusoidal waveform up to about 1MHz
3. waveform of any shape up to about 10kHz
4. sinusoidal waveform up to about 10kHz

The answer is :- 4 A moving coil instrument can be used with a bridge rectifier (instrument rectifier) up to about 10 kHz. It will be calibrated to read the r.m.s. value of a sinusoidal waveform.

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