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Old 27th June 2012, 12:33 AM   #1
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Default fluke 8800A not working

I actually have three of these, none of which works.

The manual says the Ohms converter board has two batteries on it. Neither of the units I opened have these batteries. One of them has a Rev R main board and the other has a Rev Y main board.

Anyone have experience with these DVMs?
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Old 1st July 2012, 06:37 PM   #2
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I have had the same problem.
I have two of them. On both of them the range relay chatters all the time and on all ranges
They are both useless like this and are due back on the bench soon after i get a very dodgy scope fixed and out of the way.
I will watch this thread and see if something comes up.
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Old 2nd July 2012, 11:39 PM   #3
richiem is offline richiem  United States
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My old 8800A had the chattering problem and it was two bad power supply filter caps letting gobs of AC into the system. Replacing the caps fixed everything.

RE ohms batteries, I think at some point, Fluke added an isolated supply to run the converter -- I've never seen a manual that shows it, but I'll keep looking.
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Old 4th July 2012, 02:20 AM   #4
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Mine both indeed have the isolated supply and no batteries.
I will do what the vintage radio guys call a re-cap on the power supply. I did measure the voltages and they looked fine. I suppose i could scope them and find the exact one though.
Cheers for that. Now i know.
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Old 7th July 2012, 07:53 PM   #5
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Here are the culprits.
Both of my 8800As are now awaiting spares.
I have seen light on both of them with capacitors that don't fit very well just to check that it is indeed worth ordering the parts.
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Old 7th July 2012, 08:15 PM   #6
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Here are the culprits.
Both of my 8800As are now awaiting spares.
I have seen light on both of them with capacitors that don't fit very well just to check that it is indeed worth ordering the parts.
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