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

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

________________________________________________________________________

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. [1]volt-nuts-request@febo.com wrote: Send volt-nuts mailing list submissions to [2]volt-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit [3]https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts or, via email, send a message with subject or body 'help' to [4]volt-nuts-request@febo.com You can reach the person managing the list at [5]volt-nuts-owner@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of volt-nuts digest..." ________________________________________________________________________ Today's Topics: 1. Fluke 845B (Randy Evans) _____________________________________________________________ Subject: [volt-nuts] Fluke 845B From: Randy Evans [6]<randallgrayevans@yahoo.com> Date: Wed, 24 Mar 2010 21:07:55 -0700 (PDT) To: [7]volt-nuts@febo.com To: [8]volt-nuts@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 ________________________________________________________________________ _______________________________________________ volt-nuts mailing list [9]volt-nuts@febo.com [10]https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts References 1. mailto:volt-nuts-request@febo.com 2. mailto:volt-nuts@febo.com 3. https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts 4. mailto:volt-nuts-request@febo.com 5. mailto:volt-nuts-owner@febo.com 6. mailto:randallgrayevans@yahoo.com 7. mailto:volt-nuts@febo.com 8. mailto:volt-nuts@febo.com 9. mailto:volt-nuts@febo.com 10. https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts