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4-Wire Measurement Issues

DMM7510 7½-Digit Graphical Sampling Multimeter
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Joined: July 20th, 2017, 9:21 am
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4-Wire Measurement Issues

Post by ssmartOA » July 20th, 2017, 9:27 am

I'm trying to use the 4-wire setting to accomplish a low resistance measurement. I consistently get negative readings, regardless of offset compensation being on or off. This is for unpowered circuits and generally used between points on a chassis to verify the materials are well bonded.

I've tried filtering and turning up my filter count and various other settings on the DMM to try to accomplish this measurement. Could anyone offer a suggestion on how to measure low resistance values with this instrument?

Andrea C
Keithley Applications
Keithley Applications
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Joined: October 15th, 2010, 10:35 am
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Re: 4-Wire Measurement Issues

Post by Andrea C » July 21st, 2017, 10:16 am

Sounds like you could have an EMI interference issue. Are you able to put the chassis into a shielded enclosure?
Is the chassis floating or does it have a connection to earth ground?

As a sanity check, try using a length of thick wire, such as an unfolded paper clip, to present a low ohms DUT. Place the cables at different lengths along the wire to see if the ohms increases with length.

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Re: 4-Wire Measurement Issues

Post by Kiriakos » April 25th, 2019, 2:21 am

4-Wire measurement of very low resistance this is prone to room temperature.

DMM calibration for Zero Ohms (at input) this is made at 23C, In a cold room, zero Ohms CAL this gets negative Ohm values that Zero-Ohm math setting (offset compensation) cannot remove.

For best results DUT temperature should be at above 21C.

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