INSTRUCTION MANUAL
KEW 8146/8147/8148
LEAKAGE CLAMP SENSOR
Series
KYORITSU ELECTRICAL INSTRUMENTS WORKS, LTD.,
TOKYO, JAPAN
KEW8146
KEW8147
KEW8148
LEAKAGE CLAMP SENSOR
#
DANGER
● Never make measurement on a circuit in which the
electrical potential exceeds AC300V.
● Do not make measurement when thunder rumbling. If the
instrument is in use, stop the measurement immediately
and remove the instrument from the measured object.
● Do not attempt to make measurement in the presence of
flammable gasses. Otherwise, the use of the instrument
may cause sparking, which can lead to an explosion.
● The transformer jaws are made of metal and their tips
are not completely insulated. Be especially careful
about the possible shorting where the measured
object has exposed metal parts.
● Never attempt to use the instrument if it's surface or
your hand are wet.
● Do not exceed the maximum allowable input of any
measuring range.
#
WARNING
● Never attempt to make any measurement, if any
abnormal conditions are noted, such as broken case,
and exposed metal parts.
● Do not install substitute parts or make any
modification to the instrument.
Return the instrument to the distributor from who you
purchased this instrument for repair or re-calibration in
case of suspected faulty operation.
● Always keep your fingers and hands behind the barrier
on the instrument to avoid the possible shock hazard.
#
CAUTION
● Do not step on or pinch the cord to prevent the jacket
of cord from being damaged.
● The output connector shall be removed or connected
without clamping a conductor. Otherwise, it may cause
a failure.
● Do not expose the instrument to direct sunlight, high
temperatures, humidity or dew.
● Never give shocks, such as vibration or drop, which
may damage the instrument.
● Use a damp cloth and detergent for cleaning the
instrument. Do not use abrasives or solvents.
5
3
1
2
4
6
Transform Jaws
Trigger
Cable
Output connector
Barrier
5-1 Measuring method
(1) Connect the Output connector to the Input terminal of
the measuring instrument.
(2) Press the Trigger to open the transformer jaws and
clamp onto one conductor.
In this case, the measured conductor shall be at the
center of the jaws.
(3) Ensure that the tips of transformer jaws are firmly closed.
5-2 Measuring method
(1) Measuring out of balance leakage current (See
Fig.1):Clamp onto all conductors except a grounded
wire.
(2) Measuring earth leakage current (See Fig.2):Clamp
onto a grounded wire.
3- phase 3- wire system
(In 4- wire system with neutral,
clamp onto all 4 wires)
Fig.1 Measuring out of balance leakage current
Grounded wire
Load
Load
Load
Single- phase 2- wire system
(In 3- wire system with neutral,
clamp onto all 3 wires)
Fig.2 Measuring earth leakage current
92-1746D
3-16
DISTRIBUTOR
www.
.com
1.800.561.8187
