Question

How can the input be isolated from the system?

(a) using optocouplers

(b) using op-amps

(c) using a capacitor

(d) using rectifiers

The question was asked in examination.

The origin of the question is Single Channel Data Acquisition System topic in chapter Data Acquisition System of Electrical Measurements

Answer 1

Correct option is (a) using optocouplers

The explanation is: By making use of an optocoupler, we can isolate the input signal from the system. Before processing the data, pre-amplifiers are fitted with active filters so as to eliminate the noise and boost the signal.