Measurement and Instrumentation
The internal resistance of a milli-ammeter must be very low for

 high precision.
 high accuracy.
 high sensitivity.
 minimum effect on the current in the circuit.

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

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

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