Extech Instruments MA140 User Manual page 8

Volt‐Detection Feature
The meter's audible beeper triggers and the display shows
dashes when the meter senses an electrical voltage field. The
higher the electrical field strength the greater the number of
dashes displayed and the faster the rate of the audible beeps.
If the meter does not emit a tone or display dashes in this
mode, there is still the possibility that voltage is present. Please
use caution.
1. Press the 'V' button to access the Non‐Contact Voltage
Detect mode.
2. Note the voltage detection display icons as shown in the
Description section of this guide.
3. Place the meter near a source of electrical energy. The tip
of the clamp offers the highest sensitivity.
4. Note the audible beeping and the dash displays.
Smart Data Hold
To freeze the LCD meter reading, press the HOLD button. While data hold is active, the HOLD
display icon appears on the LCD. Press the HOLD button to return to normal operation. The
HOLD icon will switch OFF.
The meter's beeper will sound and the display will flash continuously if the detected signal is 50
counts greater than the held reading.
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