Author Topic: FLUKE 87V High Z mode input Impedance value  (Read 3002 times)

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Offline kg4arn

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FLUKE 87V High Z mode input Impedance value
« on: January 13, 2013, 07:30:09 pm »
I can't find any documentation on the input impedance value for the FLUKE 87V in the High Z mode (600mV) range.

In a previous thread:  https://www.eevblog.com/forum/chat/i-need-to-know-the-history-of-fluke-87-(-1998-2010-)/msg3907/#msg3907  it was said to be greater than 4000 Megaohms.

Is this the correct number?  I can measure the loading effect of the 10Meg input impedance but I am unable to measure the loading effect in the High Z mode, so I would believe the number quoted in the thread above.
 

alm

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Re: FLUKE 87V High Z mode input Impedance value
« Reply #1 on: January 13, 2013, 08:46:51 pm »
As far as I know it's not specified by Fluke, but you can expect it to be >> 10 Mohm since it's just a FET input with some protection circuitry. Typical specs for similar meters would be something like >1 Gohm (note how they only give a minimum).
 

Offline kg4arn

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Re: FLUKE 87V High Z mode input Impedance value
« Reply #2 on: January 14, 2013, 02:14:21 am »
Thanks alm
 


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