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Summary of Contents for Extech Instruments 382356
- Page 1 User’s Manual Ground Resistance Clamp On Tester MODEL 382356...
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Page 2: Warranty
Introduction Congratulations on your purchase of Extech’s 382356 Ground Resistance Tester. This Clamp-on device allows the user to measure the ground resistance of a ground rod without the use of auxiliary ground rods. This device can only be used on multi-grounded systems. -
Page 3: Meter Description
Rotary Selector Switch LCD Display Measurement Trigger Display Symbols Ω Ohms. mA, A milliamps, Amps. •))) Continuity. NOISE Annunciator for excessive noise on the ground conductor or rod. Indicates that the clamp jaws are not fully closed. Low Battery. 382356 V2.0 5/03... -
Page 4: Specifications
± (10% + 10 Ω) typical 600.0 to 999.9 Ω 10 Ω Not specified 1000 to 1500 Ω 30 Ω Not specified Accuracy Note: Loop resistance non-inductive, external field < 50A/m, external electrical field <1 V/m, conductor centered 382356 V2.0 5/03... - Page 5 (Autorange, 50/60Hz, True RMS, Crest Factor <3.0) Ground/Leakage A Current Specifications Range Accuracy (% of reading) 0.20 to 15A ±(2.0% ±0.05A) Max Current 100A Continuous; 200A for less than 60 seconds (50/60Hz, True RMS, Crest Factor <2.0) 382356 V2.0 5/03...
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Page 6: Typical Application
Ground / Leakage Current Measurement Turn the meter on by moving the rotary switch to the mA or A position. Clamp on to the electrode or conductor Read the value of leakage current displayed on the display. 382356 V2.0 5/03... -
Page 7: Principle Of Operation
, are approximately the same, and n is large (200, for example), then R will be much less then R and may possibly approach zero. Example: If R and R …R are all 10Ω respectively and n = 200, then R by calculation equals: Ω 382356 V2.0 5/03... - Page 8 → 382356 V2.0 5/03...
- Page 9 Locate the ground conductor Clamp around the ground conductor. You should place the clamp before any splices, bonds or other splits in the ground system. Read the measured reading. Primary Ground Conductor Transmission Tower Cement Pad Branch Ground Conductors 382356 V2.0 5/03...
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- Page 11 Note: Multiple ground rods, multiple grounds i.e. ground rod(s) and water pipe grounds, or a combination may be present depending on the particular situation. In these situations it is necessary to make your measurements between the service-entrance neutral and all subsequent ground points. Distribution Panel Water Pipe Ground 382356 V2.0 5/03...
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Page 12: Troubleshooting
If the readings are not similar to what is marked on the reference loop, consult the Trouble Shooting and Maintenance sections of this manual. 382356 V2.0 5/03... -
Page 13: Maintenance
Extech recommends that calibration be performed on an annual basis to insure calibration integrity. Tech Support Hotlines 781-890-7440 ext. 200 [email protected] www.extech.com Copyright © 2000 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 382356 V2.0 5/03...