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CLIP |
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APPLICATION NOTES FOR ACCURATE LOW RESISTANCE
MEASURMENTS |
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These kelvin test leads are used for low resistance measurements. these measurements can be made using a DMM micro-ohmmeter or a separate current source and voltmeter. With this configuration, the test current (I) is forced through the test resistance (R) through one set of test leads, while the voltage (VM ) across the DUT is measured through a second set of leads called sense leads. although some small current may flow through the sense leads, it is usually negligible and can generally be ignored for all practical purposes. the voltage drop across the sense leads is negligible, so the voltage measured by the meter (VM ) is essentially the same as the voltage (VR ) across the resistance (R). consequently the resistance value can be determined much more accurately than with the two-wire method. Note that the voltage-sensing leads should be connected as close to the resistor under test as possible to avoid including the resistance of the test leads in the measurement. |
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VM: voltage measured by meter •
VR : voltage across resistor (R) because current
is freglgiible,VM = VR and measured
resistance 
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KELVIN
TEST LEAD SET FOR DMMs AND ACCURATE
FOUR WIRE LOW RESISTANCE MEASUREMENTS |
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A 65cm high quality test lead featuring 2 gold
plated kelvin clips connected to 4 gold plated banana plugs and an
alligator clip connected to a 4mm banana plug lead provided for grounding
or guarding • brass metal parts • gold plated bellow springs
of tempered beryllium copper Cable: RG 174/U co-axial cable •
stranded BCCS conductor • PE insulation
• pvc sheath
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These Kelvin Test Leads are "Compatible with DMMs/LCR Meters of Agilent, Keithely, Fluke, Hioki, Philips, Tinsley, NF Corporation and other Imported manufacturers" |
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