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
Which of following is not correct?

 A shunt should have a very low resistance.
 An ammeter should have a very low resitance.
 Voltmeter should have very high resistance.
  An electronic voltmeter draw appreciable current from the source.

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