Extech Instruments 382152 Manual de usuario

User's Manual

Earth Ground Resistance Tester

Model 382152

Introduction

Congratulations on your purchase of the Extech Earth Ground Resistance Tester. This

device can measure resistance (in 3 ranges) and AC voltage to 200V. 2mA constant

current test signal permits earth resistance tests without tripping current breakers in the

circuit under test. Single, momentary tests or automatic 3-minute tests can be selected.

This device was designed to meet IEC-1010 (EN 61010) safety standards.

Earth Ground Resistance Testers are useful for:

•Estimating ground resistance of a proposed substation or transmission tower.

•Computing inductive coupling between neighboring power and communication

circuits.

•Designing cathode protection systems.

•Geological surveys.

Careful use of this meter will provide years of reliable service.

Model 382152 Ver. 1.6 April 2001

Warranty

EXTECH INSTRUMENTS CORPORATION 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 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 for authorization. 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.

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)

Model 382152 Ver. 1.6 April 2001

Specifications

Measurements Earth ground resistance (in 3 ranges) and AC voltage to 200V

Display 3-1/2 digit (1999 count) LCD with LED test status indicator

Data hold Freezes latest reading on the LCD display

Automatic Test 3 minute test timer with automatic power down

Measurement trigger Push-button single reading or 3 minute automatic test lock

Test lead length Red: 50' (15m), Yellow: 33' (10m), Green: 16' (5m)

Power supply Six 1.5V 'AA' batteries (included)

Low battery indication LCD displays 'B' icon

Over-range indication '1' displayed as most significant digit

Safety IEC-1010 (EN-61010) category III

Weight 27.7oz. (800g) with batteries

Dimensions 6.42 x 3.94 x 2" (163 x 100 x 50 mm)

Supplied accessories Test leads (3), auxiliary earth bars (2), six 'AA' batteries,

and carrying case

Range Specifications

Measurement Range Resolution Accuracy

Earth Ground Resistance

2mA test current (820Hz)

20, 200, 2000Ω

0.01Ω, 0.1Ω, 1Ω

± (2% rdg + 2 d)

Earth Voltage

Frequency: 40 to 500Hz

0 to 200VAC

0.1V ± (1% rdg +2d)

Meter Description

1. Earth ground test lead terminal

2. Test status LED

3. Data Hold switch

4. Automatic 3-min. test OFF button

5. LCD Display

6. C1, P1 Aux bar test lead terminals

7. Function select switch

8. Resistance range select switch

9. Push-button momentary test

10. Automatic 3-min. test ON button

Model 382152 Ver. 1.6 April 2001

Operation

Test Connection Diagram

Test Preparation and Setup

1. Connect the test leads to the meter as follows:

•Green lead to the 'E' terminal

•Yellow lead to the 'P' terminal

•Red lead to the 'C' terminal

2. Drive the Auxiliary Earth Bars C1 & P1 (included) into the ground. Align the bars

equidistant to the existing Earth ground connection and in a straight line as shown in

the diagram above.

3. Ensure that the bars are between 17 and 33 ft (5 and 10 meters) apart. If the auxiliary

bars are placed in close proximity to the ground stake, measurement inaccuracies will

result.

4. Connect the clamp ends of the test leads to the Earth bars and existing ground

connection spike as shown above.

Earth Voltage Test

1. Set the meter's function switch to the ACV position.

2. Press the PUSH-ON button to perform a single, momentary test.

3. Press the PUSH-ON and TIMER ON buttons simultaneously to begin a 3-minute test.

The 3-minute test automatically shuts down after 3 minutes. Press the Timer OFF

button to end an automatic test at any time.

4. The front panel test status LED will light if the test is operating correctly. If the LED

does not light check for problems such as open circuits or overload conditions.

5. Note the LCD reading.

6. 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.

Bars

equidistant

17 to 33 ft

(5 to 10m)

apart

17 -33 ft

(5 -10m)

Existing

ground connection

Green

lead

Yellow

lead

Red lead

METER

Ground surface

Model 382152 Ver. 1.6 April 2001

Earth Resistance Test

1. Set the meter's function switch to the ohms position and set the range switch to the

desired resistance range.

2. Press the PUSH-ON button to perform a single, momentary test

3. Press the PUSH-ON and TIMER ON buttons simultaneously to begin a 3-minute test.

3-minute tests automatically shut down after 3 minutes. Press the Timer OFF button to

end an automatic test at any time.

4. Note the displayed reading. The front panel test status LED will light if the test is

operating correctly. If the LED does not light, check for problems such as open circuits

or overload conditions.

5. If high resistance is detected, note the value and take appropriate steps to correct the

ground connection if necessary.

6. Readings between 300 to 600Ω(in the 2kΩrange) are typical when the test leads are

not connected to the meter.

Data Hold

Data Hold freezes the latest measurement reading on the LCD.

1. Select ON from the Data Hold selector switch to turn Data Hold ON.

2. The reading that was on the display when the switch was set is now held on the LCD.

3. The Data Hold function does not retain measurement data if the meter is turned off.

4. Select OFF from the Data Hold selector switch to return meter to normal operation.

Model 382152 Ver. 1.6 April 2001

(

Tech Support Hotlines

781-890-7440 ext. 200

[email protected]

www.extech.com

Maintenance

Battery Replacement

When the low battery icon 'B' 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 rear battery compartment screw with a Phillips head screwdriver.

3. Remove the battery compartment cover and replace the six 1.5V 'AA' batteries.

4. Affix compartment cover and tighten screw.

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.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell.

For periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

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