Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


Circuits designed by David Johnson, P.E.
Last Updated on: Saturday, December 23, 2017 03:21 PM

Master Category List - Dave's Circuits

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server



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.

Click on Drawing Below to view PDF version of Schematic

Circuit UL Ground Wire Resistance Tester designed by Dave Johnson, P.E. (Apr 28, 2001)

 

More   Battery Testers  
Constant Current / Current Sink  
Resistance Meters

List of Dave's Circuits
Dave's Circuits with Descriptions
Dave's Circuits by Category

eMail David A. Johnson, P.E. about this circuit


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy


Copyright  January, 1998 - December, 2017     David A. Johnson & Associates.  All Rights reserved. 


 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.