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I am working with a Fluke 8508A, an 8.5-digit table-top multimeter. To my surprise, one of the menu options is a 4-wire DC voltage measurement.

I know how 4-wire resistance measurements work, but I am at a loss how a 4-wire voltage measurement would be beneficial. Does it give higher precision, and if so, how?

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    \$\begingroup\$ ~200 pages in the manual, can you give me a hint where it talks about 4-wire voltage measurement? \$\endgroup\$ – George Herold Sep 19 '17 at 13:11
  • \$\begingroup\$ @GeorgeHerold On page 3-5 (i.e. page 39 in the Acrobat Reader) \$\endgroup\$ – Martin J.H. Sep 19 '17 at 14:48
  • \$\begingroup\$ Laser-diode drivers often have “4-wire voltage measurement” features, but I think that’s something different. Those are measuring the diode voltage when current is driven, more like a resistance measurement, though they call it voltage. \$\endgroup\$ – Bob Jacobsen Apr 26 '18 at 20:31
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From page 3-5 (thanks) "4wV Allows operation with calibrators which provide a remote 4 wire sensing capability by providing connections between INPUT HI and SENSE HI and between INPUT LO and SENSE LO. The 4wV annunciator in the left-hand display indicates that 4-wire sensing is active."

I'm going to guess it's similar as remote sensing on a DC power supply. When you want to exclude the voltage drop along the wires. So very similar to 4-wire resistance.

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  • \$\begingroup\$ A little more from the manual in AC voltage measurement: Allows operation with calibrators which provide a remote 4 wire sensing capability by providing, at an internal reference plane within the DMM, connections between INPUT HI and SENSE HI and between INPUT LO and SENSE LO . Use of an internal reference plane can be helpful in 4wire AC, AC transfer, or 4wire AC – DC transfer applications. \$\endgroup\$ – glen_geek Sep 19 '17 at 16:45

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