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An Introduction to Electrical Instrumentation: A guide to by B.A. Gregory

By B.A. Gregory

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V. radiation. v. radiation. It may be permanised, this being a developing process similar to the normal photographic one, that is a chemical developing and fixing process. v. light is avoided; in consequence, the maker's instructions for a particular paper must not be considered to apply to all papers. If a record is obtained with a good contrast by photodeveloping, it is possible to obtain short lengths of permanent record by some of the photocopying processes. v. light), however once one photocopy has been obtained any number may be made by photocopying the photocopy.

However, small signals may be amplified electronically and the resulting larger signal used to deflect a pointer instrument, which is commonly a moving-coil meter. C. VOLTMETERS The measurement of d. c. voltage is a straightforward application of the above principle, that is a d. c. amplifier preceding the moving-coil indicating instrument. c. amplifier used will largely depend on the sensitivity, freedom from drift, and accuracy desired and will either be of the 'direct coupled' or 'chopper' type.

41 ms or 410 JlS If now a 250Hz signal were applied to the same galvanometer then the phase shift becomes A. 2 per cent of the length of the waveform as recorded for the 50 Hz wave would result. Such an error is of the same order of magnitude as the resolution of measurement using a chart reader with vernier scales and in most cases may be neglected, although it must be included in an error analysis of the-measurement method (see page 214). v. records. 64 value forT} is more important from consideration of amplitude error than from a phase difference viewpoint.

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