EXTECH EX380950 [4/10] Operation

380950-EU-EN-V1.1 7/12

Operation

Notice: Read and understand all WARNING and CAUTION statements listed in the safety section

of this operation manual prior to using this meter. Set the function select switch to the OFF position

when the meter is not in use.

DC/AC Current Measurements

Warning: Disconnect the test leads from the meter before making current

clamp measurements.

1. Set the Function switch to the 80ADC, 4ADC, 80AAC or 4AAC range. If

the range of the measured is not known, select the higher range first then

move to the lower range if necessary.

2. For DC current measurement, press the ZERO key to null the meter

display.

3. Press the trigger to open jaw. Fully enclose one conductor to be measured.

4. The clamp meter LCD will display the reading.

DC/AC Voltage Measurements

1. Set the rotary function switch to the V position.

2. Insert the black test lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (V/Hz) jack

3. Select AC or DC with the MODE button

4. Connect the test leads to the circuit under test

5. Read the voltage on the display. The display will indicate the proper decimal point

and value.

Resistance Measurements

1. Set the function switch to the

 •))) CAP position.

2. Insert the black test lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (V Hz jack.

3. Touch the test probe tips across the circuit or part under test. It is best to disconnect

one side of the part under test so the rest of the circuit will not interfere with the

resistance reading.

4. Read the resistance on the display. The display will indicate the proper decimal point

and value.

Continuity Check

1. Set the function switch to the

 •))) CAP position.

2. Push the mode button to indicate •))) on the display.

3. Insert the black lead banana plug into the negative (COM) jack

Insert the red test lead banana plug into the positive (VHz) jack.

4. Touch the test probe tips to the circuit or wire you wish to check.

5. If the resistance is less than approximately 150, the audible signal will sound. If the

circuit is open, the display will indicate “OL.”.