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Fluke 87 III Over Load indication.
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Topic: Fluke 87 III Over Load indication. (Read 1604 times)
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firewalker
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Fluke 87 III Over Load indication.
«
on:
July 02, 2018, 03:57:51 pm »
Some time my Fluke 87 III displays an Over-Load on volts scale without anything connected. A simple tap on the rotary switch is enough to fix it. Bad contacts?
Alexander.
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Become a realist, stay a dreamer.
Fungus
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Re: Fluke 87 III Over Load indication.
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Reply #1 on:
July 02, 2018, 09:00:14 pm »
Certainly sounds like it.
Pull it apart and rub them with spit, that usually does the trick.
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retiredcaps
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Re: Fluke 87 III Over Load indication.
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Reply #2 on:
July 02, 2018, 09:57:57 pm »
See
http://mrmodemhead.com/blog/fluke-83-iii-rotary-switch/
"It basically works and seems to be calibrated correctly, but occasionally when set to measure Ohms, the display will flicker a bit and only display “OL”, regardless of whether the leads are connected to anything, or even shorted together. A slight tap on the rotary switch will cause it to start working correctly again. Odds are, there’s a minor problem with the internal switch contacts."
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mzacharias
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Re: Fluke 87 III Over Load indication.
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Reply #3 on:
July 04, 2018, 12:56:48 pm »
DeOxit D-100L. Apply directly to switch contacts. Do not use a spray cleaner.
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firewalker
Fungus
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Re: Fluke 87 III Over Load indication.
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Reply #4 on:
July 04, 2018, 01:45:24 pm »
I refer you to time 12m02s in this video:
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