Non-Contact Voltage Detector - Extech Instruments EX350 User Manual

Non‐Contact Voltage Detector
WARNING: It is possible for voltage to be present in a circuit even if the meter does not
beep or flash the NCV LED lamp at the top of the meter. Always verify meter operation on a
known live AC current circuit and verify that the batteries are fresh before use.
The audible beeper sounds and the LED lamp at the top of the meter flashes when the meter
senses an electrical voltage field.
If the meter does not emit a tone or flash the LED 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. EF is displayed when in this mode is selected.
3. To test, place the meter near a source of electrical energy. Note that the tip of the
meter offers the highest sensitivity.
4. If a voltage is detected, the meter will beep, the NCV LED will flash and one or more "‐"
will appear on the display. For higher detected voltages the beep and flash rate will
increase and the number of "‐" will increase.
Fig 4‐5 NON‐CONTACT VOLTAGE DETECTOR
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