Products > Test Equipment
Old Fluke Multimeters
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switcher:
The coolest post on the forum, thankyou for sharing, Mr. T.  :-+


--- Quote from: drtaylor on August 14, 2017, 06:48:41 am ---

--- Quote from: switcher on August 13, 2017, 09:20:49 pm ---
--- Quote from: drtaylor on August 10, 2017, 04:02:35 am ---My lab is all set up for a production line operation for 15 8060s and one 8062.

--- End quote ---

Would love to see some pics of your production line, Mr. T.


--- End quote ---

Well, I shouldn't have called it a production line, but the attached picture shows a portion of my workbench where I am reworking the 8060s. Each unit has a dedicated box so I wouldn't mix them up (you can see more boxes stacked on some of my instruments). My Pace MBT100 does the hard work. My glass soaking tray on the right holds 3 8060s at a time. Bottles of pure IPA are seen to the right of the covered tray.

I use one of my functional 8060s seen on the left for continuity testing (the 8060A has one of the the fastest stretched continuity functions) to make sure that any found corrosion has not eaten a trace. I also use the 200nS range to track down leakage.

A pile of pulled caps is sitting there (yeah, I'm messy) but I was thinking about checking to see how the caps would read for value and leakage current and other cap parameters just to educate myself on what exactly a 35 year old cap does. The ones that were definitely leaking electrolyte...I know what they'll measure. I'm more interested in what caps with 35 year old electrolyte measure from a unit that was still functional. The new caps are in the Mouser bags.

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switcher:
The second coolest post on the forum, thankyou again, Mr. T.  :-+


--- Quote from: drtaylor on August 14, 2017, 01:21:47 am ---Picture of prototype 8060A from my collection. You can see the MAC chip in a ceramic DIP with a glued on top, dated Jan 6 1983. The TRMS chip is in a socket. If I remember properly, I used this 8060A to test the TRMS chips for performance and consistency with the selected components.

Just to the left of the MAC chip, you can see a blue ceramic cap that is kludged with a long lead wire. In the lower left hand side you can see an LM334 and two kludged in resistors in place of the constant current diode that was and is the final design. I think I was experimenting with using more current than the FET based CC diode.

Also notable is one more Tantalum Caps than in the final design. You can see it just above the pot next to the TRMS chip. This is now a 100uF/6.3V Alum.  The tantalum cap next to the Piezo is a larger size than the final design.

--- End quote ---
Fungus:

--- Quote from: ModemHead on August 14, 2017, 02:51:13 pm ---
--- Quote from: Fungus on August 14, 2017, 01:38:48 pm ---I've just been looking at the test points on my meter and it's all weird. I'm sure there's some mistakes in the manual.

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The downloadable manual is for the most recent models manufactured, with the RMS converter daughter board.  It seems to be a mix of old and new content.  Attached is a scan of an older hardcopy manual (Rev 3 1/88).  It may clear up some things.
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I was wondering about that "daughter board" (which I don't have). Thanks for clearing it up.


--- Quote from: ModemHead on August 14, 2017, 02:51:13 pm ---Vdg (TP8) is -3.15V when measured with respect to Vdd (TP1 or TP7).

The slow square on TP6 is a convenient scope trigger for observing the integration/de-integration cycle at U3p17.

--- End quote ---

OK, it's all more or less correct then. Meter seems to work perfectly.

I can't see any obvious capacitor spew yet but I should probably pluck up courage to have a go at them. I'll wait and see what DrT's final recommendations for types/values are.
ModemHead:

--- Quote from: Fungus on August 14, 2017, 05:44:29 pm ---I was wondering about that "daughter board" (which I don't have). Thanks for clearing it up.

--- End quote ---
I only have one unit with the daughter board, pictured here.  The device in the can is an AD636KH.


--- Quote from: Fungus on August 14, 2017, 05:44:29 pm ---I can't see any obvious capacitor spew yet but I should probably pluck up courage to have a go at them. I'll wait and see what DrT's final recommendations for types/values are.

--- End quote ---
I've collected six of these and the serial number of all the ones I've seen capacitor damage on started with a "3".   "4" and up has been okay so far.  Not to say they won't spew their guts tomorrow though...
Fungus:

--- Quote from: ModemHead on August 14, 2017, 06:45:22 pm ---I've collected six of these and the serial number of all the ones I've seen capacitor damage on started with a "3".   "4" and up has been okay so far.

--- End quote ---

Mine is 492xxx that's nearly a 5!

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