Extech Instruments MA61 User Manual page 13

NCV Non‐Contact AC Voltage Detector
CAUTION: Remove test leads from meter before attempting NCV tests. Always verify the
NCV function on a known live circuit before performing tests. Do not use the NCV function if the
display does not show EF when the function switch is turned to the NCV position. If the meter
does not switch on when the NCV mode is initiated, please check the batteries.
With the meter on and switched to the NCV mode, holding the front tip of the clamp jaw near a
live electrical, electromagnetic, or electrostatic field causes the beeper to sound, the display to
shows dashes, and the red LED lamp to flash. The threshold is 100V. The greater the field
strength the greater the number of dashes and the faster the rate of the audible beeps and the
flashing LED lamp.
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. Turn the Function switch to the NCV position to access the Non‐Contact Voltage Detect
mode.
2. Note the voltage detection display icon NCV and the larger EF display. If these displays are
not seen when the NCV mode is accessed do NOT attempt to use the meter. Check the
batteries and try again. If the meter still does not
switch on when the NCV mode is accessed please
have the meter serviced or replaced.
3. Place the meter near a source of electrical energy.
The front tip of the clamp offers the highest
sensitivity.
4. Note the audible beeping, the dash displays, and the
flashing LED lamp when an electrical or
electromagnetic field of at least 100V is sensed. Note
that electrostatic energy will trigger the NCV
detector, this is normal.
Data Hold
To freeze the displayed reading on the LCD, press the Data Hold (H) button (the H icon will
appear on the display). To release the Data Hold function and return the meter to normal
operation, press the Data Hold (H) button again (the H icon will switch off).
Fig‐10 NON‐CONTACT AC VOLTAGE DETECTOR
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