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Old Fluke Multimeters

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tautech:

--- Quote from: WastelandTek on November 18, 2018, 06:39:07 pm ---I've been away for the summer

did we lose Dr. Taylor?

--- End quote ---
Nope.
He looks in from time to time to check on us all......last time was just 3 days ago if you check his profile.  ;)

I'm sure he quite enjoys being called Dr. when in fact they are just his initials.  :)

WastelandTek:
Oh good.

I'm just going to call him Dr. anyway, its a Wasteland conferred honorary degree  ;)

GregDunn:
Again, to avoid filling generic threads with specifics, my new 8600A update/repair thread:

https://www.eevblog.com/forum/repair/fluke-8600a-battery-powered-multimeter-convert-to-line-only/

elecdonia:

--- Quote ---I have a non-battery 8600A; but perhaps it's a good idea to check/replace the caps anyway.  I'm doing a voltage reference comparison right now, but when that's done I can pop it open.  Looks like the electrolytics are easily available values.  Is there any value to replacing tantalum caps too?  I know older HP gear has a problem with them.
--- End quote ---

I replaced the power supply filter caps in most of my AC mains-powered 8600A units. High ESR is usually the issue with these capacitors. I don't recall changing out any tantalum caps so far.

By far the most common issue with battery powered 8600A is needing to replace the 4000mAh NiCd cells.

Both line-powered and battery-powered units 8600A units often have bad connections at the large male pins that connect to the daughter cards.

Another fault I noticed recently is drifting zero offset when first powered up after several months of non-powered storage. I think this comes from leakage currents flowing through dirt on the PC board surfaces. Thorough PC board cleaning/drying seems to correct this issue.

med6753:

--- Quote from: elecdonia on November 20, 2018, 09:42:32 pm ---
--- Quote ---I have a non-battery 8600A; but perhaps it's a good idea to check/replace the caps anyway.  I'm doing a voltage reference comparison right now, but when that's done I can pop it open.  Looks like the electrolytics are easily available values.  Is there any value to replacing tantalum caps too?  I know older HP gear has a problem with them.
--- End quote ---

I replaced the power supply filter caps in most of my AC mains-powered 8600A units. High ESR is usually the issue with these capacitors. I don't recall changing out any tantalum caps so far.

By far the most common issue with battery powered 8600A is needing to replace the 4000mAh NiCd cells.

Both line-powered and battery-powered units 8600A units often have bad connections at the large male pins that connect to the daughter cards.

Another fault I noticed recently is drifting zero offset when first powered up after several months of non-powered storage. I think this comes from leakage currents flowing through dirt on the PC board surfaces. Thorough PC board cleaning/drying seems to correct this issue.

--- End quote ---

That drift could also been caused by this........

https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1974341/#msg1974341

Took me quite a while to track it down but it is now absolutely rock stable.

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