# Need Help

W

#### [email protected]

Jan 1, 1970
0
i am haveing a problem trying to work out the math I have a meter of
unknown value i want to use as 9 and 15 volt meters. My fluke 75 is
an auto ranging dmm and it will only move the needle 2/3rds scale. So
i dont know the full scale resistane of the coil. And I am confused on
200ua and 200 micro amp. What is 200ua and 200micro amp's? I know ma
=miliamp,I guess you can tell i am not a wiz with electronics!lol

R

#### Rheilly Phoull

Jan 1, 1970
0
i am haveing a problem trying to work out the math I have a meter of
unknown value i want to use as 9 and 15 volt meters. My fluke 75 is
an auto ranging dmm and it will only move the needle 2/3rds scale. So
i dont know the full scale resistane of the coil. And I am confused on
200ua and 200 micro amp. What is 200ua and 200micro amp's? I know ma
=miliamp,I guess you can tell i am not a wiz with electronics!lol
So 200micro amp and 200ua are the same (the 'u' stands for 'micro').
For the voltmete,r take the fluke and connect across the input to the
unknown voltmeter, put a 1meg pot in the line to the unknown voltmeter and
then adjust it to read the same as the fluke. Disconnect every thing and
measure the resistance of the pot to establish the resistance needed to be
in series with the unknown meter.

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