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Old Fluke Multimeters

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TubeDoc:
I am relativly new to this blog, but have enjoyed the information traded here, esp the histroy of the early Fluke multimeters. 

I, too am a bit of a meter junky.  I have a good example of all but a couple of the 8020 series of meters up through the 8060s, with a few odd meters good for parts, etc.  I have a few 8800As or 8810As that light up and measure but that have problems with ranging, etc. I also have some miscl buttons, knobs, etc. for 8000s and 8600s.  I would happily swap the bech meters for something else.  I'm not sure of the ettiquite or mechanics for swaping parts here.

Thanks again for the great information and enthusiasm.   

Neomys Sapiens:

--- Quote from: TubeDoc on March 22, 2019, 04:00:00 pm ---I am relativly new to this blog, but have enjoyed the information traded here, esp the histroy of the early Fluke multimeters. 

I, too am a bit of a meter junky.  I have a good example of all but a couple of the 8020 series of meters up through the 8060s, with a few odd meters good for parts, etc.  I have a few 8800As or 8810As that light up and measure but that have problems with ranging, etc. I also have some miscl buttons, knobs, etc. for 8000s and 8600s.  I would happily swap the bech meters for something else.  I'm not sure of the ettiquite or mechanics for swaping parts here.

Thanks again for the great information and enthusiasm.

--- End quote ---
There will be a dedicated thread for T&M 'parts mules' shortly. Keep looking for that and list yours then.

imaradiostar:
I've really enjoyed reading this thread. I have two 8060's - one that's early and has been recapped, and one that's a much later unit and doesn't appear to need recapping...YET.

I purchased the recapped unit on eBay and found that the MAC socket was damaged but not replaced. I replaced it and cleaned the board (IPA and ultrasonic cleaner) while I had it apart. I also dunked and cleaned the MAC chip with alcohol as I found some green junk on the pins. After thorough cleaning it passes ADC self test with a correct count.

I have an HP 3456a and an Analogic AN3100 DC standard, and an assortment of other multimeters, including a few 8050s. I can tweak any of them to match across each range, but the recapped 8060a still drifts a bit and overnight it no longer matches the other meters, off by a count of 40 or so while the others still match. I've also found that if I tweak it to read 0.1900vdc or 1.9000vdc correctly, it doesn't scale to lower voltages correctly while the others all easily meet spec.

Is it fair to assume there is still junk on the board or MAC somewhere causing the incorrect scaling? What should I look for?

I have an additional IBM unit that doesn't work and if I'm going to order parts to rebuild it I might as well order more spares!

Thanks!

jamie

retiredcaps:

--- Quote from: imaradiostar on April 28, 2019, 01:05:38 am ---Is it fair to assume there is still junk on the board or MAC somewhere causing the incorrect scaling? What should I look for?

--- End quote ---
Did you check the bottom bung of the electrolytic caps?

imaradiostar:
Truthfully, I read on eBay that is was recapped, saw recent soldering and flux, and didn't check all of them. I don't wish to throw the seller under the bus but it wasn't to my usual level of craftsmanship. At this point I'm tempted to simply redo it. There's no point in having a high count meter that isn't as accurate as my Chinese amazon cheapies!

I guess it makes sense to order three sets of caps and various other bits and hunker down for some rebuilds. I have a nice Pace sodr-x-tractor and the work will go fast.

JT

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