10amps vs 100amps contact resistance tester

[vinod]

Gentlemen,

Why the Elec. Technicaian using '100amps' contact resistance tester instead of '10Amps' tester to test 3000Amps bus bar connections?

Can anybody give an explanation for this?

 

[zog]

It is a matter of accuracy, the higher the test current the more accurate the readings will be at lower readings. A 3000A bus connection will have a very low reading so accuracy is important.

 

[vinod]

It is clear to me..Thanks...

 

[dereckbc]

Zog pretty well summed it up. 100 amps is 10 times or 1000% more accurate than 10 amps.