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Kelvin leads for DMM

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gamalot:
I compared the difference when the shield of the test leads were grounded or left floating on my Hioki RM3545 DC resistance meter. You can see that the difference is 'huge' when the resistance under test is 100K ohms, and there is still a 'tiny' difference when the resistance is as low as 100 ohms.

tooki:
Where it would get interesting is with very high resistances. (Like the 40MOhm resistor I had to measure a few weeks ago.)

TimFox:
I recently built some shielded banana-plug leads from Pomona patch cords and shield braid because of difficulty measuring resistors > 100 k ohms with a bench DMM.
This improved body- and hand-capacitance effects when the shields were connected to "LO", but I had better results with a different setup and a "real" ground connection to the shields.

gamalot:
I tested the highest value resistor I could find, a cheap 1G ohm/5 watt high voltage resistor I bought from China. At such high resistance values, without any well-grounded shield, the results would be obviously bad.

Someone:

--- Quote from: gamalot on March 11, 2022, 07:42:11 pm ---I tested the highest value resistor I could find, a cheap 1G ohm/5 watt high voltage resistor I bought from China. At such high resistance values, without any well-grounded shield, the results would be obviously bad.
--- End quote ---
The periodicity of that interference is rather "suspicious" bench DMMs are usually excellent at rejecting external interference when correctly configured.

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