Extech Instruments 380260 User manual

User Guide

Model 380260

Insulation Tester /

Megohmmeter

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 380260 Product Page

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Model 380260 Version 2.2 1/08

Introduction

Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model

380260 provides three test ranges plus continuity and AC/DC voltage measurement. A handy

test lock feature and a data hold function are also included. This professional meter, with

proper care, will provide years of reliable service.

Safety

1. Circuits under test must be de-energized and isolated before connections are made

(except for voltage measurements).

2. Circuit connections must not be touched during a test. Use extreme caution when

working near bare conductors and bus bars. Accidental contact with conductors could

result in electrical shock.

3. Use caution when working near voltages above 60VDC or 30VACrms.

4. After insulation tests, capacitors must be discharged.

5. Test leads (including alligator clips) must be in good working order, clean and without

broken or cracked insulation.

6. When servicing, use only specified replacement parts.

International Safety Symbols

Caution, refer to this manual before using this meter

Dangerous Voltages

Meter is protected throughout by double or reinforced insulation

Meter Description

1. LCD Display

2. Hold Button

3. Test Button

4. Rotary Switch

5. Backlight Button

6. Lock Button

7. Input Terminals

Model 380260 Version 2.2 1/08

Operation

Connecting Test Leads

For all measurements, connect the red test lead to the VΩinput terminal and the black

test lead to the COM input terminal.

Test Lead Check

1. Set the rotary switch to the 200Ω range.

2. Touch the test lead tips together.

3. Resistance should read less than 0.5Ωand the audio tone should sound.

4. With the leads not touching, the display should read infinity indicated by “1”.

5. Readings displayed other than the readings described above are indicative of a test

lead problem. The test leads must be replaced before using the meter. Failure to do

so could result in damage to equipment and electrical shock.

Insulation Resistance Measurements (Megohmmeter Tests)

Warning: Do not perform Insulation Resistance measurements if AC Voltage is present on the

device under test.

1. Connect the red test lead to the VΩinput terminal; black lead to the COM terminal.

2. Set the function switch to the desired MΩ test voltage position.

3. Connect the tips of the test leads to the equipment under test. If there is a voltage

present, a constant beep will sound and the voltage will be displayed.

4. The display will show “1“ until the TEST button is pushed. Press and hold the TEST

button. The upper right display shows the test voltage applied and the flashing high

voltage symbol will be displayed. The main display shows the resistance.

5. Keep the test leads connected to the equipment under test and release the TEST

button. The circuit will discharge through the meter. Keep the test leads connected

until the circuit is completely discharged and the upper right display shows 0 volts.

Lock Function

For hands-free operation, use the LOCK feature.

1. With the test leads connected to the equipment under test, simultaneously press the

TEST and LOCK keys.

2. The LOCK icon” ” will appear on the display. A beeper will sound every 2

seconds to indicate that the meter is in Lock mode.

3. Press the LOCK key to disable the Lock function and end the test.

Warning

Ensure that the circuit under test does not include componentsthat can be damaged by 1000VDC; such

devices include power factor correction capacitors, low voltage mineral insulated cables, electronic light

dimmers, and ballasts/starters for fluorescent lamps.

Model 380260 Version 2.2 1/08

Notes on IR (Megohmmeter) testing:

1. The maximum measurement range for the 380260 is 2000M. Frequently, insulation

resistance will exceed this value. When this happens, the display will indicate “1”,

meaning the resistance is very high and the insulation being tested is good.

2. If the device being tested is highly capacitive, the display will indicate an increasing

resistance value over time. Always wait until the reading has stabilized before

recording the value.

AC/DC Voltage Measurement

1. Set the Rotary switch to the ACV or DCV position.

2. Connect the red test lead to the VΩ terminal and the black test lead to the COM

terminal.

3. Connect the test leads to the circuit under test.

4. Read the voltage value on the LCD.

Resistance Measurement WARNING

Do not run this test unless ACV = 0. Do not use this mode to check diodes.

1. Set the Rotary switch to the 200kΩposition.

2. Connect the red test lead to the VΩ terminal and the black lead to the COM terminal.

3. Connect the tips of the test leads to the circuit under test.

4. Read the resistance value on the display.

Low Resistance (Continuity) Measurement

1. Set the Rotary switch to the 200position.

2. Connect the red test lead to the VΩ terminal and the black lead to the COM terminal.

3. Connect the tips of the test leads to the circuit under test.

4. Read the resistance value on the display. When the resistance of a circuit is less than

approx. 40Ω, the audible tone will sound.

Auto Power Off

To conserve battery life, the meter will automatically turn off after approx. 15 minutes of

non-use. To turn the meter back on, turn the rotary switch to OFF, then to the desired

function.

Hold Function

The hold function freezes the reading in the display. Press the HOLD key momentarily to

activate or to exit the hold function

Backlight

Press the key for to turn on the display backlight function. The backlight will

automatically turn off after 15 seconds.

Model 380260 Version 2.2 1/08

Notes:

1. The STARTER must be in the ON position during the

Motor Starter Mains

Switch Line

GND

Applications

Measuring Power Tools and Small Appliances

This section applies to any device under test that uses a line

cord. For double insulated power tools, the meter’s leads

should be connected to the device’s housing (chuck, blade,

etc.) and the lines of the power cord.

Testing AC Motors

Disconnect the motor from the line by disconnecting the wires from the motor terminals or

opening the mains switch.

If the mains switch is opened, and the motor also has a motor-starter, then the starter must

be held in the ON position. With the mains switch opened, the measured resistance will

include the resistance of the motor wire and all other components between the motor and

the main switch. If a weakness is indicated, the motor and other components should be

checked individually. If the motor is disconnected at the motor terminals, connect one

meter lead to the grounded motor housing and the other lead to one of the motor leads.

Refer to diagram at below.

Testing DC Motors

1. Disconnect the motor from the line.

2. To test the brush rigging, field coils and armature, connect one meter lead to the

grounded motor housing and the other lead to the brush on the commutator.

3. If the resistance measurement indicates a weakness, raise the brushes off of the

commutator and separately test the armature, field coils and brush rigging (one at a

time). Leave one lead connected to the grounded motor housing while testing the

motor components. This also applies to DC Generators.

Model 380260 Version 2.2 1/08

Testing Cables

1. Disconnect the cable under test from the line.

2. Disconnect the opposite end of the cable to avoid errors as a

result of leakage from other equipment.

3. Check each conductor to ground and/or lead sheath by

connecting one meter lead to ground and/or lead sheath and

the other meter lead to each of the conductors in turn.

4. Check insulation resistance between conductors by

connecting meter leads to conductors in pairs. Refer to

diagram at right.

Specifications

Range Specifications

Accuracies are specified as % reading + digits at 23oC ± 5oC < 80% RH

MEGOHMMETER RANGES

Range Resolution Accuracy Terminal Voltage

200MΩ/250V 0.1MΩ±3% + 5d 250V + 10% ~ -0%

200MΩ/500V 0.1MΩ±3% + 5d 500V + 10% ~ -0%

0-1000MΩ/1000VDC 1MΩ±3% + 5d 1000V + 10% ~ -0%

1000-2000MΩ/1000VDC 1MΩ±5% + 5d 1000V + 10% ~ -0%

Range Test Current Short Circuit Current

200MΩ/250V 250kΩ (load)

200MΩ/500V 500kΩ (load)

0-1000MΩ/1000VDC

1000-2000MΩ/1000VDC

1mA

1MΩ

<1mA

AC VOLTAGE (40Hz-400Hz)

Range Resolution Accuracy Input

Impedance Overload

Protection

750VAC 1V ±1.2% + 10d 10MΩ750Vrms

DC VOLTAGE

Range Resolution Accuracy Input

Impedance Overload

Protection

1000VDC 1V ±0.8% + 3d 10MΩ1000Vrms

RESISTANCE

Range Resolution Accuracy Max. Open

Circuit Voltage Overload

Protection

200Ω0.1Ω±1% + 2d 4.5V 250Vrms

200kΩ0.1kΩ±1% + 2d 3V 250Vrms

General specifications

Display LCD with dual display

Sampling rate 2.5 readings per second

Continuity beeper <40, short circuit current <200mA, open circuit voltage

4.5V

Over range indicator ‘1’ displayed

Zero adjust Automatic

Low battery indicator Low battery symbol displayed when battery voltage is low

Environmental Installation category II, Pollution Degree 2, Altitude up to

2000 meters, Indoor use only

Power source Six (6) 1.5 ‘AA’ batteries

Fuse 250mA/600V ceramic 3AG Fast blow

Operating conditions 32 to 104oF (0 to 40oC); 80% RH

Storage conditions 14 to 140oF (-10 to 460oC); <80% RH

Dimensions 7.8 x 3.6 x 1.9” (200 x 92 x 50mm)

Weight 24.6oz (700g)

IEC 1010 CAT III-1000V

Approvals

Battery Replacement

When the low battery symbol appears on the LCD, the six

1.5V ‘AA’ batteries must be replaced.

1. Turn the meter off and remove the test leads

2. Unsnap the tilt stand from the rear of the meter

3. Remove the four Phillips head screws holding the battery

cover

4. Remove the battery compartment cover

5. Replace the batteries observing polarity

6. Affix the rear cover and secure the screws.

7. Reattach the tilt stand

Cleaning

Periodically wipe the case with a dry cloth.

Do not use solvents or abrasives to clean this

instrument.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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