Operating Instructions - Extech Instruments 38390 User Manual

Digital ac clamp meter
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OPERATING INSTRUCTIONS

Precautions
1.
Ensure that the selected meter function matches the measurement to be taken.
2.
If the measured current is higher than the range selected for long periods, overheating may
occur compromising the safety and the operation of the meter's internal circuits.
3.
To avoid discharge risks and erroneous readings, do not measure current on high voltage
conductors (>600V).
AC Current Measurements
WARNING: Make sure that the test leads are disconnected from the meter's terminals before
making current measurements with the clamp jaw.
1.
Set the Function switch to the A range..
2.
Press the trigger to open jaw. Fully enclose one conductor to be measured.
3.
The clamp meter will automatically select the proper range (Auto Range).
4.
Read the measured value from the LCD display.

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