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

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

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

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