Measurement and Instrumentation
Electrostatic instruments are normally used for

High current measurements
Low current measurements
Low voltage measurements
High voltage measurements

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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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