Extech 382357 Operating Manual
User’s Manual
Ground Resistance
Clamp On Tester
MODEL 382357
Warranty
EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it
should become necessary to return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at (781) 890-7440 EXTENSION 210 for authorization or visit www.extech.com
more information. A Return Authorization (RA) number must be issued before any product is returned to
Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent
damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not
be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or
oral, is expressed or implied.
for
Introduction
Congratulations on your purchase of Extech’s 382357 Ground Resistance Tester. This
Clamp-on device allows the user to measure ground resistance without the use of auxiliary
ground rods. This device can only be used on multi-grounded systems. It is not necessary
to disconnect the ground under test. Proper use and care of this meter will yield years of
reliable service.
Safety
Only qualified technicians should operate this meter.
Use extreme caution when operating the meter near energized electrical equipment.
Do not attempt to use this meter to twist or pry the ground electrode or ground wire
away from grounded equipment.
All metal objects or wires connected to the electrical system under test should be
assumed to be lethal until tested. Grounded systems are no exception.
Ensure that the batteries are inserted correctly in the battery compartment.
Remove the batteries from the meter if the meter is to be stored for long periods.
WARNING: If the meter is used in a manner not specified by the manufacturer, the built
in protections provided by the meter may be impaired.
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user
must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use,
hazardous voltages may be present
2
Model 382357 Version 1.0 June 2004
Description
1. Jaw Assembly
2. Hold Button
3. Rotary Selector Switch
4. LCD Display
5. Record Button
6. ▼(decrement) Button
7. ▲(increment) Button
8. Function Button
9. Measurement Trigger
1
2
9
6
8
7
3
4
5
Display Symbols
Ω Ohms (resistance measurement)
mA, A milli-amperes, Amperes (current measurements)
•))) Hi Lo alarm position
NOISE Excessive noise on the ground conductor or rod
Clamp jaws are not fully closed
Low Battery
REC Indicates data logging in progress
NO. Indicates the READ function
H Hold function activated
3
Model 382357 Version 1.0 June 2004
Specifications
General Specifications
Resistance Test Frequency: 3.333 kHz (15mV rms approx.)
Max Conductor size 0.9” (23mm)
Display 4-digit (9999 count) display
Sampling rate 0.5 seconds
Power supply One 9V battery
Power consumption 40mADC
Battery Life 3000 measurements
o
Temp. Coefficient 0.15 times the specified accuracy per
64ºF (4 to 18
o
C) and 82 to 122ºF (28 to 50
Current Overload Protected to 100A Continuous; 200A for less than 60
seconds (50/60Hz)
Continuity check Audible tone if reading is less than approx. 40Ω
Range selection Automatic ranging
Safety Meets the requirements for IEC1010-1 Category III 300V
and Category II 600 V
Operating conditions 14 to 122
Storage conditions -4 to 122
o
F (0 to 50
o
F (-20 to 60
o
C) with < 85% RH
o
C) with < 75% RH
Dimensions 10.1 x 3.9 x 1.9” (257 x 100 x 47mm)
Weight 1.4lbs (640g)
Accessories Resistance check plate, 9V battery, & carrying case
C (from 39 to
o
C))
4
Model 382357 Version 1.0 June 2004
Loading...