9
VGB
（
VAC ONLY
）
“
Ghost” voltage means voltage that appears on a conductor that
is not actually energized. This often occurs on spare conductors in
a conduit or cable. The spare conductors are very close to the live
conductors. The capacitance between the live and spare conductors
causes the “ghost” voltage to appear when the measurement is made
with a high impedance meter. A DMM with 10 MΩ input impedance is
one example of a high impedance meter. The VGB network is connected
across the input terminals to provide low input impedance. Low
input
impedance is used to reduce any “ghost” voltage to very small levels,
about 2 to 5 volts.
By engaging the VGB (a bleep will sound every 3 seconds to
confirm VGB is engaged) mode your DMM can distinguish a ghost
voltage by effectively
‘Killing’ it. If the voltage being measured is a
true (hard) voltage(10-15 Vac) the multimeter will automatically switch
to true voltage measurement mode .
AC VOLTAGE MEASUREMENTS
CAUTION:
Do not measure AC voltages if a motor on the circuit
is being switched ON or OFF. Large voltage surges may occur
that can damage the meter.
1. Set the function switch to
“
AC
” position(V~ or V
DC-AC
).
2. Insert the black test lead banana plug into the negative
COM
jack.
Insert red test lead banana plug into the positive
V
jack.
3. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the
“hot” side of the circuit.
4. Read the voltage in the display