The applications for low resistance testing are varied, but some of the most common are:
Testing switches, connectors, and relays - to ensure contact resistance is within specified values.
Cable resistance - too low shows too much copper in the cable (higher costs), and too high means insufficient copper, so the cable’s current carrying capacity is compromised.
Motors and generators - to determine heat rise under load, measure winding resistance, and check for short or open circuits.
Fuses - to ensure resistance is within specified values.
Cable looms - to check the bonding and interconnections when installing equipment, racks, etc.
UPS/car batteries - carrier to plate weld resistance where a high resistance indicates poor weld quality that will restrict the battery’s ability to carry current.