Question

[Ram ji]

Which of the following instruments have highest input impedance?
1. VOM
2. VTVM
3. TVM
4. FETVM

 

[Alec_t]

Welcome to EP!
As you have identified neither the manufacturer nor the model of any of the instruments there is no unique answer. When you know the makes and models, check their datasheets.

 

[shrtrnd]

Yeah, sounds like a homework question.
This used to be a snap answer, but with all the fancy electronic improvements in test and measurement instruments
over the years, I think your teacher's question is a little out-dated (maybe he needs to go back to school).
You pretty much have to check specific manufacturer spec sheets anymore to answer that one.

 

[HellasTechn]

Yeah, sounds like a homework question.

sure does.

 

[Ram ji]

This question is asked in LMRC JE exam 2015 as it is.

 

[hevans1944]

Almost all Third World Countries believe the answer is FETVM.

See this page for possible clarification or obfuscation... your choice.