Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 change the magnitude of the input signal while retaining its identity.
 change the quantity under measurement to an analogues signal.
 to perform non liner operation like clipping filtering, chopping and clamping.
 to perform linear operation like addition and multiplication.

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

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