Explain why often a FET base differential amplifier is used in electronic voltmeters?

1 ⤊

Explain why often a FET base differential amplifier is used in electronic voltmeters?

2007-01-06 16:30:14 · 2 answers · asked by Gayan S 1 in Science & Mathematics ➔ Engineering

2 answers

Mainly because they have an extremely high input impedance, which doesn't appreciable load the circuit being tested.

2007-01-06 16:48:45 · answer #1 · answered by charley128 5 · 1⤊ 0⤋

FET is the transtitor which has its o/p characteristics controlled by i/p voltage and it is very similar to the vacuum tube in operation such as the i/p impedance

2007-01-06 17:28:35 · answer #2 · answered by sachin s 1 · 0⤊ 0⤋