EXTECH 380260 [3/8] Connecting test leads

380260-EU-EN-V2.4-4/12

Operation

Connecting Test Leads

For all measurements, connect the red test lead to the VΩ input 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 0.5Ω 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 VΩ input 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 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.