Resistance Measurement; Auto Power Off - Extech Instruments 380260 User Manual

Notes on IR (Megohmmeter) testing:
1. The maximum measurement range for the 380260 is 2000MΩ. 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

Do not run this test unless ACV = 0. Do not use this mode to check diodes.
1. Set the Rotary switch to the 200kΩ 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.
Low Resistance (Continuity) Measurement
1. Set the Rotary switch to the 200Ω
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.
WARNING
position.
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Model 380260 Version 2.2 1/08