Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

Most be of low temperature co-efficient
All of the listed here
Should have low specific resistance
Should non magnetic

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 only the magnitude of the quantity being measured.
 magnitude, phase and waveform of the quantity being measured.
 both of above.
 only phase of the quantity being measured.

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