| Products > Test Equipment |
| 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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