Non-Contact, High Voltage Detector 275HVD
11
4.3 Testing the 275HVD Before Operating
Switch the sensitivity to “TEST”. The warning buzzer should emit continu-
ous audible tone and the warning light LEDs should light up. This indicates
that the sensor is operational and the battery functional.
Perform the following steps to ensure that the 275HVD detects volt-
age on a known live conductor.
• Select the 240VAC range and place the sensing head near a known
live (low voltage) conductor (if not available, rub the sensor with
a cloth or against a clothing item to generate a DC static charge
which will trigger the sensor circuit detection).
• The warning light and warning beeper should go ON as if a live
conductor were being tested.
NOTE: Positioning the sensing dome near a computer screen or a TV
screen (not liquid crystal display type) should also trigger the tester while
on the 240V selection.
4.4 High Voltage Testing
See Warning on Page 5
The 275HVD Non-Contact High Voltage Detector works by proximity. It
is not designed to be in physical contact with live conductors. Its sensor
detects the radiated eld which surrounds live conductors.
Do not touch live conductors with the 275HVD
Non-Contact High Voltage Detector.
Radiated eld strength increases with voltage and decreases quickly with
distance and/or ground shielding. The radiated eld from a cable where
conductors supplying three-phase power are close together, tends to
cancel out (See § 4.2). The rotary switch (attenuator) is used to identify
and differentiate various HV live cables.
The tester must only be used with an appropriate insu-
lated rod or Hot Stick when measuring High Voltage.
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