Greenlee CMGRT-100 Instruction Manual page 2

Description
The Greenlee CMGRT-100 Clamp-On Ground Resistance Tester is a hand-held testing device intended to
evaluate grounding systems. It has two modes:
• Active Mode for measuring resistance
• Passive Mode for measuring current
The Active Mode induces a voltage into a conductor and measures the resulting current. It then
calculates the resistance. The Passive Mode senses the electromagnetic field surrounding a conductor
to determine the current flow.
A test resistance loop is provided to perform a quick check of the unit.
Safety
Safety is essential in the use and maintenance of Greenlee tools and equipment. This instruction manual
and any markings on the tool provide information for avoiding hazards and unsafe practices related to
the use of this tool. Observe all of the safety information provided.
Purpose
This instruction manual is intended to familiarize all personnel with the safe operation and maintenance
procedures for the Greenlee CMGRT-100 Clamp-On Ground Resistance Tester.
The CMGRT-100 is protected by U.S. Patent Number D-362639.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
Greenlee and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL
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