Extech Instruments 380260 User manual

User Guide

Model 380260

Insulation Tester / Megohmmeter

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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

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Operation

Connecting Test Leads

For all measurements, connect the red test lead to the Vinput terminal and the black test lead to

the COM input terminal.

Test Lead Check

1. Set the rotary switch to the 200range.

2. Touch the test lead tips together.

3. Resistance should read less than 0.5and 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 Vinput terminal; black lead to the COM terminal.

2. Set the function switch to the desired M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 components that 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.

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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 V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 200kposition.

2. Connect the red test lead to the V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 V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.

40 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.

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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.

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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

200M250V 0.1M±3% + 5d 250V + 10% ~ -0%

200M500V 0.1M±3% + 5d 500V + 10% ~ -0%

0-1000M1000VDC1M±3% + 5d 1000V + 10% ~ -0%

1000-2000M1000VDC 1M±5% + 5d 1000V + 10% ~ -0%

Range Test Current Short Circuit Current

200M250V

1mA

250k(load)

<1mA

200M500V 500k(load)

0-1000M1000VDC1M

1000-2000M1000VDC

AC VOLTAGE (40Hz-400Hz)

Range Resolution Accuracy Input Impedance Overload

Protection

750VAC 1V ±1.2% + 10d 10M750Vrms

DC VOLTAGE

Range Resolution Accuracy Input Impedance Overload

Protection

1000VDC 1V ±0.8% + 3d 10M1000Vrms

RESISTANCE

Range Resolution Accuracy Max. Open Circuit

Voltage

Overload

Protection

2000.1±1% + 2d 4.5V 250Vrms

200k0.1k±1% + 2d 3V 250Vrms

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General specifications

Display LCD with dual display

Sampling rate 2.5 readings per second

Continuity beeper, 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 0 to 40oC (32 to 104oF); 80% RH

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

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

Weight 700g (24.6oz)

IEC 1010 CAT III-1000V

Approvals

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Maintenance

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

You, as the end user, are legally bound (EU Battery ordinance) to return all used

batteries, disposal in the household garbage is prohibited! You can hand over your

used batteries / accumulators at collection points in your community or wherever batteries

/ accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

Cleaning

Periodically wipe the case with a dry cloth. Do not use solvents or abrasives to clean this instrument.



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