AEMC Instruments 275HVD Manual De Usuario página 19

4.5 LOW VOLTAGE TESTING
See Warnings on pages 11 and 12
The 275HVD Non-Contact High Voltage Detector works by proximity. The
275HVD is not designed to be in physical contact with live conductors. Its sensor
detects the radiated field that surrounds live conductors.
WARNING: Do not touch live conductors with the 275HVD
Non-Contact High Voltage Detector.
Radiated field strength increases with voltage and decreases quickly with
distance and/or ground shielding. The radiated field from a cable where
conductors supplying three-phase power are close together, tends to cancel out
(See § 4.2). Detecting distance of a 250 V
about 4 in (10 cm). When grouped with neutral and ground wires, as in a flexible
cable, the distance is reduced to 2 in (5 cm) or less.
4.6 FAULTS (OPEN) IN CABLES
See Warnings on pages 11 and 12
Faults in certain flexible cables can be detected with the 275HVD. If the cable
is still energized, set the 275HVD sensitivity so that it triggers, then move the
275HVD along the cable until a change in condition is obtained. An audible tone
and LED should be ON when the sensor is on the supply side of the open and
will turn OFF when on the other side.
4.7 CHANGING THE BATTERIES
Batteries should be checked with a multimeter and replaced periodically. The
275HVD Non-Contact High Voltage Detector uses (3) 1.5 V C cell batteries.
Open the battery compartment (turn the shaft counter-clockwise) to remove the
batteries. Ensure that polarity is respected when installing new batteries.
Non-Contact, High Voltage Detector Model 275HVD - User Manual
single live wire is
AC
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