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Old Fluke Multimeters
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rsjsouza:

--- Quote from: frozenfrogz on March 13, 2018, 06:03:22 pm ---
--- Quote from: rsjsouza on March 13, 2018, 03:58:49 pm ---The earlier 8020A/8022A/8024A family of portable Flukes usually had a single 2A fuse tied to the battery - the road to CAT ratings was still being paved.

The later "B" revisions of these meters replaced it with an HRC 3A fuse inside the meter.

[...]
This 8024B teardown from the user Spawn has pictures missing from the server (expired account). I'll ask him if they can be re-posted.

--- End quote ---

Thanks for the info :) Funny enough, the copy of the 8024A manual I found features the same HRC + glass fuse configuration as the 8020B, 8060A you mentioned.

Given that the pictures are not accessible any more and me liking to take some photos, I will write a small article with pictures.

--- End quote ---
You are absolutely right; my list above should not include the 8024A.
Fungus:

--- Quote from: frozenfrogz on March 13, 2018, 06:03:22 pm ---Thanks for the info :) Funny enough, the copy of the 8024A manual I found features the same HRC + glass fuse configuration as the 8020B, 8060A you mentioned.

--- End quote ---

Yes, it was common to have a small glass fuse to protect the big expensive fuse from stupid (and costly) mistakes. I've got a fluke from the 1980s that does it.

I wonder why they don't still do this, it makes a lot of sense to me.
frozenfrogz:

--- Quote from: Fungus on March 13, 2018, 09:43:45 pm ---Yes, it was common to have a small glass fuse to protect the big expensive fuse from stupid (and costly) mistakes. I've got a fluke from the 1980s that does it.

I wonder why they don't still do this, it makes a lot of sense to me.

--- End quote ---

Both, my 8060A and 8020B have this configuration. The 8024A however has only the glass fuse. From the dates on the ICs, mine is from 1979/1980. The fuse configuration seems to have been changed on the later 8024As as well, since that is what the manual shows.
I took some photos and will put them on my imgur to share with y’all.
EE-digger:
My old 8060A is still my favorite handheld DMM.  Bought it new around 28 years ago.

But this little baby has a special place in my heart.  The last time I used it I was working on a TEC cooled laser and wanted to read temperature from the onboard thermistor.  I just programmed in the Steinhart and Hart equation for the thermistor and voila, instant temperature readings !

The 8860A is fully programmable from the keypad in the image.  Sort of reverse polish, it's been a few years since I used it.

This was a good unit but a few years after I got it, I lost one of the primary windings.  As far as I recall, I was able to re-wire the other half of the primary winding.  Also had to poke around and replace 1 or 2 regulators.  I believe the PCB was fairly well labeled which was a huge help, without a schematic.
frozenfrogz:

--- Quote from: EE-digger on March 15, 2018, 01:12:15 am ---My old 8060A is still my favorite handheld DMM.  Bought it new around 28 years ago.

--- End quote ---

Congrats, that is one nice meter! :clap:
Here is a link to the service manual and schematics for this beauty: https://elektrotanya.com/fluke_8860a_sm.zip/download.html

You need to wait about 30 seconds until the ...processing... on the bottom of the page changes to a direct download link.
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