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Jester:
I picked up qty 2 Fluke 8842A's on eBay with make an offer  $180 for both.

Description was display intermittent, ac out of calibration / drifts no further testing done.

The display looks pretty good, definitely quite usable.

I have only had it up an running a couple of hours but so far looks pretty good, DC cal is right on (ran it up to 1000Vdc, and ac is pretty close compared to my three seasoned but uncalibrated 34401A's
34401A    10.0043V
34401A    10.0013V
34401A    10.0029V
8842A        9.9997V

-0.03%  I can live with that if it does not start drifting.   I will let this run for a few days. Hopefully unit #2 works, I do hear some mystery noise inside unit # 2. It has the exact same description.

Of all the non working for parts equipment that I have purchased only three pieces actually had a problem, one bad opamp, one leaky diode, one with two cables swapped. All the others worked perfectly. Total replacement parts cost < $10.

I sometimes wonder if they just want to get new equipment and write up a fake problem to get rid of the old stuff?

alm:

--- Quote from: Jester on December 23, 2021, 04:35:12 pm ---I sometimes wonder if they just want to get new equipment and write up a fake problem to get rid of the old stuff?

--- End quote ---
Or it's just that the seller doesn't have the knowledge or doesn't want to invest the time to test them, so they list them as for parts / repair so they won't get any returns.

By the way, I have two 8840A parts units with AC/GPIB boards that are missing their front panel and mechanical parts. So I might be able to help you with parts.
Jester:
First unit continues to work well.

I opened up the second unit, one of the black plastic board holders was damaged, so little piece of black plastic floating around.

No display on power up. Tapped it on the side and the display started working, tap-on , tap-off, tap-on, tap-off, this should be easy.....
Touched up the solder on pins 14 &16 of the transformer, no more tap-off. Passed the self test, still need to do full test. AC looks close at 10V, I will let it cook with the other one.

The ground screw was also missing on the bottom PCB shield, 4-40x1/4" if yours is missing and need to know what it is.

Front display lens is rough, will be looking for a nice replacement, so if someone has one, please let me know.



After 10 minutes both meters are within 2 counts of each other. I'm really glad I sold the GDM-8251, I'm already getting the warm and fuzzy feeling when taking measurements with this 30 year old fluke.


I now have 4 x Fluke DMM and 3 x HP/Agilent DMM, I think I may have a mild case of DMMitis, heading over to the group therapy thread. ;)


J-R:
I also recently snagged two 8842A units with both options installed for about $100ea delivered, listed for parts.

On the first the display would flicker and go dim after warm-up, re-soldering the transformer was the fix.  Very bright display, was probably replaced recently as a repair attempt.

The second was labelled "low value volts drifts", found some drift and inaccuracies in the 20mV and 200mV ranges as well as for very low value 4-wire resistance measurements in those ranges.  Was also getting some pretty high non-zero values with the inputs shorted.  All this after hours of warm up.  The internal wire connections to the front terminals were plastered with what I assume is dielectric grease.  Another failed repair attempt?
Ultimately found capacitor C611 was bad, out of circuit it reads a few dozen pF (supposed to be 100uF).  Replaced that and performed a calibration of the 20/200 ranges and things look very good for now.  Will let it cool off overnight and test again to see how it performs.  Maybe that was the culprit.

Checked C611 in the other unit and out of circuit it was ~35uF with ESR of 20 Ohms, so replaced that one too.  When in use the voltage across the capacitor was about 35V and it's rated for 50V.

On both units the small spade terminal connection on the main board going to the AC option board was extremely loose, gave it a little extra crimping force...

Eventually I did go ahead and clean/lube the front/rear switch and hit the transformer with a soldering iron on both units.

199,999 count.
rsjsouza:
Not as fancy as the big boy test gear around, but I got this brand new sealed Greenlee DM-200A (Brymen BM251S) for less than half the price of a new one.

Since I live in the US, lifetime warranty from Greenlee is quite sweet. Being Brymen, the quality is top notch - this little meter feels incredibly robust and well put together. I risk saying it feels as sturdy as the 87V and the 179.
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