Extech Instruments 382252 User manual

User's Manual
Earth Ground Resistance Tester Kit
Model 382252

Model 382252 Ver. 1.1 08/09
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Introduction
Congratulations on your purchase of the Extech 382252 Earth Ground Resistance Tester
Kit. This device can measure Earth Ground Resistance (in 3 ranges), Earth Voltage and
Resistance (up to 200kΩ), and AC and DC voltage. This device was designed to meet
EN61010-1 safety standards. Careful care and use of this meter will provide years of
reliable service.
Safety
Please read the following safety information carefully before attempting to operate the
meter and use the meter only as specified in this manual.
Environmental safety information
•Do not use meter outdoors when precipitation is likely
•Installation Category III
•Pollution degree 2
•Altitude: 2000 meters max.
•Ambient conditions: 32 to 104oF (0 to 40oC); RH: 80% max
•Observe the following international safety warning symbols
Safety Symbols
Caution: Refer to this manual before using this meter
Dangerous Voltages
Meter is protected throughout by double or reinforced insulation
Organizations that provide rules and guidelines for proper grounding
•The National Electrical Code (NEC)
•Underwriters Laboratories (UL)
•National Fire Protection Association (NFPA)
•American National Standards Institute (ANSI)
•Occupational Safety Health Administration (OSHA)
•Telecommunications Industry Standard (TIA)

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Meter Description
1. Digital Display – See Display Description below
2. HOLD key – Freezes measurement value on
display
3. 0 ADJ control- Adjusts Zero value on display
4. Backlight key – Turns on Backlight
5. TEST key – Enables Earth Resistance and Earth
Voltage Tests
6. Function Selector switch – Selects desired range
and function
Top View
1. VΩ/C Input
2. P Input
3. COM/E Input
Display Description
1. Test status Icon
2. Battery Charge indicator -
3. Voltage Unit indicator
4. Audible Signal Icon
5. Ω/kΩ Units Indicators
6. Measurement Value
7. AC/DC Voltage Indicators
8. Low Battery Icon
9. HOLD Icon
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3
4
5
7
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9
6
12 3
1
2
3
4
5
6

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Operation
0 Adjustment
1. Connect the test leads to the meter as follows:
a. Green lead to the 'E' terminal
b. Yellow lead to the 'P' terminal
c. Red lead to the 'C' terminal
2. Set the function selector switch to the desired measurement range.
3. Short the 3 test leads together.
4. Press the TEST key.
5. Use the 0 Adjust knob to adjust the displayed reading to 0Ω.
6. Press to TEST key again to end the 0 adjustment process.
Test Connection Diagram
1. 382252 Meter
2. Green Test Lead
3. Yellow Test Lead
4. Red Test Lead
5. Existing Ground
6. P1 Auxiliary Earth Bar
7. C1 Auxiliary Earth Bar
Test Preparation and Setup
1. Connect the test leads to the meter (1) as follows:
•Green lead (2) to the 'E' terminal
•Yellow lead (3) to the 'P' terminal
•Red lead (4) to the 'C' terminal
2. Drive the Auxiliary Earth Bars P1 (6) & C1 (7) into the ground. Align the bars
equidistant to the existing Earth ground connection and in a straight line as shown in
the diagram above. If the auxiliary bars are placed in close proximity to the ground
stake, measurement inaccuracies will result.
3. Connect the clamp ends of the test leads to the Earth bars and existing ground
connection as shown above:
•Green lead (2) to the existing ground (5)
•Yellow lead (3) to Earth Bar P1 (6)
•Red lead (4) to the Earth Bar C1 (7)
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567

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Earth Voltage Test
1. Set the function on the selector’s switch to the EARTH VOLATAGE position.
2. Confirm that the voltage measurement is less than 10V AC; otherwise accurate Earth
resistance measurements cannot be made. If voltage is present (higher than 10V AC),
the source of the voltage must be found and corrected before testing can continue.
3. Press to TEST key to end the test. Note the LCD reading.
Earth Resistance Test
1. Set the meter's function switch to the desired resistance range.
2. Press the TEST button. . The “ “ icon will flash and the audible signal will sound.
3. Note the displayed reading.
4. If high resistance is detected, note the value and take appropriate steps to correct the
ground connection if necessary.
5. Press to TEST key to end the test.
6. Readings of “1”…Ωare typical when the test leads are not connected to the meter.
HOLD Function
The Hold function freezes the latest measurement reading on the LCD.
1. Press the HOLD key to freeze the reading on the LCD
2. Press the HOLD key again to exit the HOLD function.
3. The HOLD function does not retain measurement data if the meter is turned off.
Backlight
1. Press the “ “ key to turn on the backlight.
2. The backlight will turn off after approximately 15 seconds.
200kΩResistance Measurement
1. Connect the red test lead to the VΩ connector and the black test lead to the COM
connector.
2. Set the function selector switch to the 200kΩ position.
3. Connect the test probes to the circuit or component under test.
4. Note the displayed Resistance value.
AC Voltage Measurement
1. Connect the red test lead to the VΩ connector and the black test lead to the COM
connector.
2. Set the function selector switch to the 750V AC position.
3. Connect the test probes to the circuit under test.
4. Note the displayed Voltage value.
DC Voltage Measurement
1. Connect the red test lead to the VΩ connector and the black test lead to the COM
connector.
2. Set the function selector switch to the 1000V DC position.
3. Connect the test probes to the circuit under test.
4. Note the displayed Voltage value.

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Maintenance
Battery Replacement
When the low battery icon ' ' appears on the LCD, the meter's batteries must be
changed.
1. Remove power and disconnect the test leads from the meter.
2. Remove the tilt stand from the rear of the meter.
3. Remove the 4 battery compartment screws with a Phillips head
screwdriver.
4. Remove the battery compartment cover and replace the six 1.5V 'AA'
batteries.
5. Affix compartment cover and tighten screw.
6. Reattach the tilt stand.
Cleaning and Storage
Periodically wipe the meter's case with a damp cloth and mild detergent; do not use
abrasives or solvents. If the meter is not to be used for a period longer than 60 days,
remove the batteries and store them separately.
Specifications
General Specifications
Measurements Earth Ground Resistance (in 3 ranges), Earth Voltage,
AC Voltage to 750V and DC Voltage to 1000V
Display Large LCD with dual display
Sampling Time 2.5 times per second
Test lead length Red lead: 50' (15m), Yellow: 33' (10m), Green: 16' (5m)
Over-range indication '1' displayed as most significant digit
Power supply Six 1.5V 'AA' batteries (included)
Low battery indication LCD displays icon
Auto Power Off After approximately 15minutes of use
Safety EN-61010-1 category III
Weight 24.7oz. (700g) with batteries
Dimensions 7.9 x 3.62 x 2" (200 x 92 x 50 mm)
Supplied accessories Multimeter Test leads (2), Earth Ground test leads (3),
auxiliary earth bars (2), six 'AA' batteries, and carrying case
Operating Conditions 32ºF to 104ºF (0ºC to 40ºC), with < 80% RH
Storage Conditions 14ºF to 140ºF (-10ºC to 60ºC), with < 70% RH

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Measurement Specifications
Measurement Range Resolution Accuracy
Earth Ground
Resistance
20Ω 0.01Ω± (2% reading + 10 digits)
200Ω0.1Ω± (2% reading + 3 digits)
2000Ω1Ω
Earth Voltage
Frequency: 40 to
500Hz
0 to 200VAC
0.1V ± (3% reading +3digits)
Resistance 0 to 200kΩ0.1kΩ± (1% reading +2 digits)
Overload Protection: 250 Vrms
AC Voltage
40 Hz to 400Hz
0 to 750V 1V ± (1.2% reading +10 digits)
Overload Protection: 750 Vrms, Input Impedance: 10MΩ
DC Voltage 0 to 1000V 1V ± (0.8% reading +3 digits)
Overload Protection: 1000 Vrms, Input Impedance: 10MΩ

Support line [phone]
Technical support: Extension 200; E-mail: [e-mail]
Repair & Returns: Extension 210; E-mail: [e-mail]
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Warranty
EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY)warrants this instrument to
be free of defects in parts and workmanship for one year from date of shipment (a six
month limited warranty applies to 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 [phone] ext. 210 for authorization or visit our
website www.extech.comfor contact 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.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright ©2009 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
more infor for Extech 382252
Phone: [phone]
Email: [e-mail]
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Air Concern Ltd, Building 173 Curie Avenue Harvell Didcot, Oxfordshire