[volt-nuts] Fluke 845

[wje]

   I have one also. I don't use it all that often since I've gotten a very
   nice Ballantine auto-balance unit.
   I'd suggest a thorough cleaning to start. My initial guesses would be
   the zero potentiometer itself, followed by the range switch, followed
   by dirty pcbs. Even when working perfectly, the meter will bounce
   around a little bit on the most sensitive range just from the intrinsic
   circuit noise.
   If you still have unacceptable noise levels, suspect a noisy component.
   That's going to be a bit harder to diagnose.
   BTW, do you have the mod to replace the old, impossible to find,
   mercury battery reference with a more modern battery? If not (or even
   if you do), be sure the battery voltage is correct.
Bill Ezell
----------
They said 'Windows or better'
so I used Linux.

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Today's Topics:

   1. Fluke 845B (Randy Evans)
        _____________________________________________________________

     Subject:
     [volt-nuts] Fluke 845B
     From:
     Randy Evans [6]<randallgrayevans at yahoo.com>
     Date:
     Wed, 24 Mar 2010 21:07:55 -0700 (PDT)
     To:
     [7]volt-nuts at febo.com

     To:
     [8]volt-nuts at febo.com

I bought a Fluke 845B on e-bay and it seems to work except that it is very noisy
 on the most sensitive ranges, the drift/noise is up to +/- 10uV and it is very
difficult to try and zero it (read impossible).  I would like to repair it but I
 would appreciate some suggestions on what the problem might be and what I shoul
d look for.

Thanks,

Randy Evans, AE6YG






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