Circuit - Sensors / Detectors: Resistance Meters Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 07:52 AM

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Sensors / Detectors: Resistance Circuits

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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