Operation - Extech Instruments 380260 User Manual

Operation

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.
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
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
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"
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
range.
will be displayed. The main display shows the resistance.
" will appear on the display. A beeper will sound every 2
3
Model 380260 Version 2.2 1/08