Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

  Minimize the effect of temperature variation.
 Minimize the effect of stray magnetic fields.
 Reduce the size of the meter.
 Obtaine large deflecting torque.

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

 Frequency and period measurment modes, respectively.
 Frequency measurment modes only.
 Period measurment modes only.
  Period and frequency measurement modes respectively.

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