Cable Testers and Harness Testers Made Easy!

Use this calculator when you want to choose thresholds for your wire tests. This calculator will estimate the resistances of your fixturing, the connector's contact resistance, the device under test (DUT) resistance, and variations caused by temperature and measurement accuracy. If you have any questions about cable or harness testing call us toll-free 1-800-441-9910.

Step 1) Find the Wire Resistances
Units of Measure		All lengths in FeetMeters All resistance values in ohms All wire gauges are AWG All wire is copper
Your Fixturing		The wire from tester to:
		Point A:  Length Gauge 01234 56789 1011121314 1516171819 2021222324 2526272829 3031323334 3536373839 40	___ ohms
		Point B:  Length Gauge 01234 56789 1011121314 1516171819 2021222324 2526272829 3031323334 3536373839 40	___ ohms
		Contact resistance from fixture to DUT:
		At Point A: ohms	___ ohms
		At Point B: ohms	___ ohms
Your Device Under Test		Wire in DUT:
		Length Gauge 01234 56789 1011121314 1516171819 2021222324 2526272829 3031323334 3536373839 40	___ ohms
Wire Resistance Results		Expected resistance of:
		A 2-wire measurement:	___ ohms
		A 4-wire measurement (points combine at A and B):	___ ohms
		4-wire measurement (points combine on DUT):	___ ohms
Step 2) Factor in the Variations
Variations		Wire Resistance % Wire Length %
		Max Temperature °	___%
		°F or °C FC Accuracy of Tester   Percent of reading %   Fixed error ohms
Recommended Thresholds
		Highest Expected Resistance for 2-wire:	___ ohms
		Highest Expected Resistance for 4-wire (points combine at A and B):	___ ohms
		Highest Expected Resistance for true 4-wire (points combine on DUT):	___ ohms

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