Question

Devices that pass the signal from its source to the measurement device without a physical or galvanic connection by using transformer, optical or capacitive coupling technique are called?

(a) filters

(b) rectifiers

(c) bridges

(d) isolaters

This question was addressed to me by my college director while I was bunking the class.

The question is from General Considerations for Signal Conditioners topic in chapter Recording System of Biomedical Instrumentation

Answer 1

Correct option is (d) isolaters

To explain I would say: Such devices are called isolaters. Improper grounding of the system is one of the most common causes of measurement problem and noise. Signal conditioners with isolation can prevent these problems. Besides breaking ground loops, isolation blocks high voltage surges and rejects high common mode voltages.