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Fluke 115 and Nanofarad Capacitance Readings

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bdunham7:

--- Quote from: Martin72 on April 16, 2023, 09:40:49 pm ---I guess the fluke use dc-signal for cap testing, therefore the lower the cap is, the worser it gets.

--- End quote ---

With a 0.22µF capacitor (an accurate and very good one) it does as shown in attached photo.  The connection of a 10X PP215 probe causes the reading to change from 220nF to 235nF.

Barry A. Waters:

--- Quote from: Martin72 on April 16, 2023, 09:40:49 pm ---We got several 117 here and 1 or 2 115, can check this tomorrow - Could be interesting because we never used them for cap testing.

--- End quote ---

That would be VERY much appreciated! Any ceramic or film cap in the nF range from 1 nF to 999 nF would be excellent!

Barry

Swainster:
For my particular case, the suspicious 100nF ceramic caps were tested on a hand held LCR meter and a nanoVNA - all confirm that the true capacitance really was arounf 50-60nF. I also found another budget kit of ceramic disc caps, and this was even worse! only 42nF capacitance for a 104 marked cap. In fact, in this particular kit, the 683 marked parts measured 50nF-ish vs 40nF-ish for the 104 :palm:. I guess that you really only get what you pay for (though the cheap SMD kits are usually quite OK).

So the verdict - my Fluke 115 is innocent, whereas cheap kits of ceramic disk caps, not so much. Plus I learned that the markings on cheap ceramics should not be relied upon.

Martin72:
Hi,

To my surprise we have at least 5 pcs Fluke115... ;)
I´ve test them all with the same result - No problems..
For the pic I got four from the five, bought between 2009 and 2020, on the desk, everyone measures the same type of cap (ceramic, 100nF).
After this I´ve connected a bnc cable to the scope - unfortunately I´ve forgot to make a pic from the 100nF measure... :palm:   ;)
Will repeat it tomorrow.

Martin

Barry A. Waters:

--- Quote from: Martin72 on April 17, 2023, 05:31:17 pm ---Hi,

To my surprise we have at least 5 pcs Fluke115... ;)
I´ve test them all with the same result - No problems..

--- End quote ---

That's OUTSTANDING! Thank you Martin!

I tested several of the 100 nF and 220 nF caps I was using with the meters over the weekend in a charging circuit today on the DS1054Z and found them all to be close enough for my purposes (hobbyist). Even the wonky Ceramic Y5V 104Z KCKs came out OK (0.000066 s / 554 ohm = 119 nF) so I'm sure my problem is not faulty caps. Can't wait for the third meter to show up and see what's what!

Barry

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