The HHM-NVC40 provides a safe
non-contact way to check whether
an electric line or cable or AC
outlet is “hot” (energized).
It does so by sensing from a short
distance the electromagnetic
field created by AC voltage. Even
unloaded AC circuits generate
electromagnetic fields. Although
these fields are extremely weak,
their constantly changing nature
means that they generate some
current.
A sensitive non-contact voltage
detector can sense this current via
induction, in much the same way
that a sensitive radio receiver can
sense weak radio waves. Noncontact
voltage (NCV) detectors,
including the HHM-NCV40, cannot
detect DC voltages (such as those
found in automotive electrical
systems) or AC voltage through a
wall or metal conduit.
Unlike the typical NCV detector,
the HHM-NCV40 has adjustable
sensitivity—a feature that makes it
possible to determine which wire
in a bundle is the “hot” wire. This
application calls for turning down
the sensitivity in stages after the
HHM-NCV40 senses voltage. As
you reduce sensitivity, at some
stage only the energized wire will
produce a field strong enough to
activate the audible and visual
alarms from a short distance.
In this way, the HHM-NCV40’s
adjustable sensitivity takes the
guesswork out of identifying the
“hot” wire of a bundle.
The HHM-NCV40 also has
a wider detection range (5 to
1000 Vac) than the typical NCV
unit. The ability to detect the
presence of 12 Vac in noncontact
fashion is particularly
useful during troubleshooting
of hardwired process plant and
industrial automation systems
and equipment such as gas and
water valves, fans, lights, relays,
inverters, solenoids and horns.
Hardwired commercial and
residential building doorbells/
buzzers and thermostats are
also commonly powered by
12 Vac. The ability of the
HHM-NCV40 to detect 480V using
its lowest sensitivity setting makes
troubleshooting and installing
generators and fluorescent lighting
ballasts easier, faster and safer.
Specifications Detection Range: 5 to 1000 Vac at
50 to 400 Hz Detection Distance: 64 mm (2.5") max Power Source: 2 “AAA” batteries
(included) Operating Temperature: 0 to 40°C
(32 to 104°F) @ <85% RH Dimensions: 154 L x 32 W x 28 mm D
(6.1 x 1.3 x 1.1") Weight (with Batteries): 55 g (1.8 oz)
† All dollar amounts on this site are shown in US currency.
Note: Comes complete with 2 “AAA” batteries and operator’s manual. Ordering Example: (1) HHM-NCV40 Non-contact voltage detector with adjustable sensitivity, USD$615.00
