Electronics > Beginners

Fluke 87V shows -OL when in ohms range - normal or not?

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exe:

--- Quote from: Electro Detective on July 22, 2019, 09:36:01 am ---i.e. it's looking a bit suss, don't buy it  :--

--- End quote ---

on the other hand, it's an opportunity to ask for a discount and have fun with repairing it :)

Electro Detective:

--- Quote from: exe on July 22, 2019, 09:42:21 am ---
--- Quote from: Electro Detective on July 22, 2019, 09:36:01 am ---i.e. it's looking a bit suss, don't buy it  :--

--- End quote ---

on the other hand, it's an opportunity to ask for a discount and have fun with repairing it :)

--- End quote ---

I'm with you there  :-+ but may be pushing the luck getting fixit docs from Fluke for an issue like this

Then again, a simple CAL might sort it out  :-//



vinyl:
My 28II show OL, but sometimes the minus sign appears and disappears immediately.

Brumby:

--- Quote from: exe on July 22, 2019, 09:42:21 am ---
--- Quote from: Electro Detective on July 22, 2019, 09:36:01 am ---i.e. it's looking a bit suss, don't buy it  :--

--- End quote ---

on the other hand, it's an opportunity to ask for a discount and have fun with repairing it :)

--- End quote ---
... If, in fact, it needs repair.

I keep wondering if it is just a slight bias that the ADC registers as negative.  With an input around zero, it would only take a poofteenth of nothing (in the wrong direction) to be classified as "negative".

This is just a thought - and I cannot discount the possibility that this is indicative of a real problem - but I'd be tempted to get my hands on it and do some side-by-side comparison measurements with a known good meter.  I suspect it could function within specification (assuming no other faults).

vinyl:
My 28II ohm auto range (60 mega ohm) momentarily shows a minus sign and disappears soon. Manual range 60Mega is the same.

manual range (6 mega ohm --- 600 ohms), OL is always displayed.

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