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Old Fluke Multimeters
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rsjsouza:
I have  also found the same scenario. I ended up leaving my cap in the same position as assembled.  :-DMM


--- Quote from: rsjsouza on September 20, 2020, 07:01:42 pm ---Ok, so I cracked open my two Flukes:

The 8060A (serial number 4245166) has a Siemens orange capacitor (!) that I replaced a few years ago - either I had nothing better on hand or had a mental fart. Negative points to the display, therefore I suspect I followed my golden rule to never trust the silk screen (I have been bitten before).

The 8062A (serial number 4210192) has the original yellow capacitor. Negative also points to the display. I will replace and, in the light of all this, I will probably keep the assembled polarity instead of the silk/schematics one. Not only there is a chance the bias voltage is too small to make a difference, but the weight of 30, 35 years of continuous operation without fail are enough for me to make a decision.

--- End quote ---
cdrat:
"I have  also found the same scenario. I ended up leaving my cap in the same position as assembled."

Thanks, that is reassuring, I don't want to mess this up!
robert.rozee:
the orientation of C19 seems to have been variously discussed for years. has anyone hooked up a scope across the cap and checked what sort and polarity of signal is presented to it in actual use?


cheers,
rob   :-)
Fungus:

--- Quote from: robert.rozee on October 13, 2022, 03:00:24 am ---the orientation of C19 seems to have been variously discussed for years. has anyone hooked up a scope across the cap and checked what sort and polarity of signal is presented to it in actual use?

--- End quote ---

This.

We're in a forum full of test gear nutcases. It seems like it would be really easy to just measure the voltage across the thing instead of all this finger-crossing and hoping.
J-R:

--- Quote from: yo0 on October 12, 2022, 10:10:33 pm ---I have 3 fluke dmms 8010a, 8012a and 8050a, all working good in all functions except diodes check, all show higher than normal readings, any idea? All with 1n4148 under test.

Best regards.

Pio

--- End quote ---

I have a Fluke 8050A and it reads high as well.
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