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  • Author Author: Matt
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4-Wire Resistance Measurements -- Workbench Wednesdays 19

 

 

Bench DMMs have an extra set of banana jacks called "sense." Known as a Kelvin or 4-wire measurement, these inputs accurately measure small resistances. Like, milliohms small. In this video, learn how to use a multimeter with 4-wire capability, prove 4-wire is more are accurate (in some cases), and a trick to get more accurate measurements with traditional 2-wire techniques.

 

Supplemental Material:

 

 

Bill of Material:

 

Product NameManufacturerQuantityBuy KitBuy Kit
MP730028 US Bench DMM, 5.5 DigitsMulticomp Pro1Buy NowBuy Now
Through Hole Resistor, 0.1 ohm, 3 W, ± 5%, Axial LeadedMulticomp Pro1Buy NowBuy Now
Through Hole Resistor, 1 ohm, 250 mW, ± 5%, Axial Leaded, 250 VMulticomp Pro1Buy NowBuy Now
Handheld DMM (72-7780)Tenma1Buy NowBuy Now
Test Lead Set, Banana Plug, Test Clip, Black, Red, 914 mmTenma1Buy NowBuy Now

 

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  • in reply to axelschmidt

    Hi Axel,

     

    Glad to see you on active on the community!

     

    Since a couple of people were upset about my use of "small caps," we decided to change the font used in future diagrams. The one we used up until now did not support lowercase letters. So I used "small caps" to indicate lowercase. You'll notice with the video Workbench Wednesday 21: DMM Half-Digits Explained, the font in the diagrams is different. (And it has native lowercase letters.)

     

    As for the units mix up, that was a mistake on my part. Good catch. Even though the previous shot clearly showed milliamps, I put microamps in the graphic.