Operation - Extech Instruments MA61 User Manual

Operation
Meter Power
Caution: Do not use the meter with battery compartment open or unsecured.
The clamp meter is powered by two (2) AAA batteries. The battery compartment is located on the
back of the meter. The battery compartment is secured by one Phillips head screw. Refer to the
Battery Replacement section later in this guide for more information.
Automatic Power OFF (APO)
The meter automatically switches off after 15 minutes of inactivity. Before switching off, the meter
beeps several times to alert the user. To disable APO, hold down the MODE button while powering
up the meter. The meter will beep five (5) times indicating that APO is disabled; release the button.
Note that the APO icon is not visible on the display when APO is disabled. APO is re‐enabled on
the next cycling of meter power.
Current Measurements ‐ Clamping Technique
Clamp around only one conductor. Refer to Fig‐3 below. The diagram at left is correct and the
diagram at right is incorrect.
Fig‐3 Correct and Incorrect Clamping Techniques
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