Teardown : Keithley Model 182-M sensitive voltmeter

[TiN]

Traded one of my 2001 DMMs for this interesting instrument.



Tbd..

If you have ideas for experiment involving low DC voltage , let me know.

[daqq]

If you have ideas for experiment involving low DC voltage , let me know.

Try some test plugs thermal voltage. Also banana connectors, coaxes, all sorts of connectors really. That would make a nice experiment - where can you find your unwanted thermocouples. 

[Zucca]

If you have ideas for experiment involving low DC voltage , let me know.

Congrats! I was looking for that too. I am happy it is in your good hands now.

1) Take a high amp connector, see what the voltage drop is in high current situations (>30A let´s say). will it be linear to the current or the temperature effect will kick in?

2) We all know the GND layer on a PCB, test how much it will shift in an interesting PCB. Will it be 0V also on the other corner of the board?

3) Take different op amp and test the Offset Voltage on the output

4) What about different DACs with the output set to zero? Will the analog output will be zero?

BONUS) Try to measure how much current it is needed by the 182-M to do its measures.


Bye

[TiN]

Alright, first part of review is public, second part will feature measurements and more comparisons.

Few money shots : front-end and LMx99 ovenized voltage reference.

We all know the GND layer on a PCB, test how much it will shift in an interesting PCB. Will it be 0V also on the other corner of the board?

This will be interesting, I'll try to do this.