Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The error is high due to eddy current effect
The meter does not respond to DC signals
The error is high due to hysteresis effect
The meter is calibrated for AC and it’s error for DC would be high

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Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Ripples of the DC supply.
  Stray thermal emfs.
 Stray magnetic fields.
 Errorneous standardisation.

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