[volt-nuts] Resistance standard
holrum at hotmail.com
Tue Dec 15 23:11:54 UTC 2009
Before blindly pouring mineral/baby/sperm/snake/Wesson/etc oil over your resistors, you need to check the oil for contamination and leakage. The Fluke 720A KVD manual talks about how to check that unit for contamination based leakage resistance (which must be < 10E12 ohms).
Basically you series connect (with teflon wire) a 1000 V supply, two of the KVD terminals, and a 1.1 meg resistor and measure the voltage drop across the resistor with your null voltmeter (with everything isolated on high quality dielectric sheets). To check your oil do the same sort of thing with two electrodes immersed in the oil (which is in a scrupulously cleaned glass container) It probably wouldn't hurt if the electrodes were gold or platinum.
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