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More Battery
Testers
Constant Current / Current Sink
Resistance Meters
UL GROUND RESISTANCE TESTER
UL requires that an electrical system using a metal chassis earth ground connection
have a resistance of less than 0.1 ohms. This resistance must be tested with
actual line current in excess or 10 Amps. The circuit shown uses a couple of
LEDs to indicate if in fact the resistance is less than 0.1 ohms. It uses a
modified transformer to produce a 2.5vac output with at least 10 Amps of supply
current.
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