INSTRUCTION MANUAL
KEW 8146/8147/8148
LEAKAGE CLAMP SENSOR
Series
KYORITSU ELECTRICAL INSTRUMENTS WORKS, LTD.,
TOKYO, JAPAN
KEW8146
KEW8147
KEW8148
LEAKAGE CLAMP SENSOR
1. Safety warnings
This instrument has been designed, manufactured and
tested according to IEC 61010: Safety requirements for
Electronic Measuring apparatus, and delivered in the
best condition after passing quality control tests. This
instruction manual contains warnings and safety rules
which have to be observed by the user to ensure safe
operation of the instrument and to maintain it in safe
condition. Therefore, read through these operating
instructions before using the instrument.
#
WARNING
● Read through and understand instructions contained
in this manual before using the instrument.
● Keep the manual at hand to enable quick reference
whenever necessary.
● The instrument is to be used only in its intended
applications.
The operating instructions described in the manual
must be observed.
● Understand and follow all the safety instructions
contained in the manual.
It is essential that the above instructions are adhered
to. Failure to follow the above instructions may cause
injury and or instrument damage.
The symbol
#
indicated on the instrument, means that
the user must refer to the related parts in the manual
for safe operation of the instrument. It is essential to
read the instructions wherever the
#
symbol appears
in the manual.
#
DANGER
is reserved for conditions and actions that
are likely to cause serious or fatal injury.
#
WARNING
is reserved for conditions and actions
that can cause serious or fatal Injury.
#
CAUTION
is reserved for conditions and actions that
can cause minor injury or instrument damage.
Safety symbols
Incoming wire
Ｏ:
Device which is
not directly
connected to the
mains power supply
Socket
Interior wiring
○Measurement Category:
To ensure safe operation of measuring instruments,
IEC 61010 establishes safety standards for various
electrical environments, categorized as O to CAT IV,
and called measurement categories. Higher-numbered
categories correspond to electrical environments with
greater momentary energy, so a measuring instrument
designed for CAT III environments can endure greater
momentary energy than one designed for CAT II.
O
: Circuits which are not directly connected to the
mains power supply.
CAT II : Electrical circuits of equipment connected to an
AC electrical outlet by a power cord.
CAT III : Primary electrical circuits of the equipment
connected directly to the distribution panel, and
feeders from the distribution panel to outlets.
CAT IV : The circuit from the service drop to the service
entrance, and to the power meter and primary
over-current protection device (distribution
panel).
2. Features
● Clamp sensor for AC leakage current measurement.
● Can measure up to:
KEW 8146：30A
KEW 8147：70A
KEW 8148：100A
● Designed to international safety standard IEC61010-2-032
CAT. Ⅲ Pollution Degree 2
3. Instrument layout
4. DIN Plug pin assignment
3: GND pin
5: Output signal pin
6: Sensor Signal pin
（ Resistance between 3Pin and 6Pin:
8146 : 47kΩ 8147 : 8.2kΩ 8148 : 30kΩ）
1, 2 and 4 : No use
* Lower figure shows the pin assignment seeing the Clamp
sensor from output connector part. The figure of the pin
assignment of connection terminal is symmetrical to lower
figure.
5
3
1
2
4
6
Transform Jaws
Trigger
Cable
Output connector
Barrier
5. Operating instructions
#
DANGER
● Never make measurement on a circuit in which the
electrical potential exceeds AC300V in order to avoid
possible shock hazard.
● 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.
.
#
CAUTION
● Take sufficient care to avoid shock, vibration or
excessive force when handling the instrument.
Otherwise, precisely adjusted transformer jaws will be
damaged.
● When transformer jaws do not fully close, never try to
close them by force, but make them free to move and
try again. If a foreign substance is stuck in the jaw
tips, remove it.
● When making current measurements, keep the
transformer jaws fully closed.
Otherwise, accurate measurements cannot be taken.
● Hold the inserting part (except for the cable) and
disconnect the Output connector from the measuring
instrument so as not to cause a break in the cord.
● When measuring current which pulse element is
superposed, differences of the indicated value may
be caused between ranges, if the peak value exceeds
the measurement range to a large extent. In this case,
the reading at the bigger range should be taken as a
right value. Sensitive transformer jaws are used for
Leakage clamp meter. Because of the characteristics
of transformer jaws, which can be opened and
closed, it is impossible to eliminate the interference
of external magnetic field completely. If there is a
presence of strong magnetic field, use the instrument
at a distance as far as possible from it. Following are
the typical things generating magnetic field.
・Conductor fed large current
・Motor
・Equipment which has magnet
・Integrating wattmeter
DISTRIBUTOR
#
Refer to the instructions in the manual.
Indicates a Instrument with double or reinforced insulation
Indicates that this instrument can clamp on live bare
conductors when the voltage to be tested is below
Circuit - Ground-to-Earth voltage against the indicated
Measurement Category.
～
Indicates AC
MINI DIN 6PIN
50MΩ or greater at 1000V
between Jaw and enclosure
between enclosure and output terminal
between Jaw and output terminal
Model
Rated voltage
Output voltage
Measuring range
Accuracy
(Input: sine wave)
Temperature & humidity range
(Guaranteed accuracy)
Operating temperature range
Storage temperature range
Maximum permissible input
Output
impedance
Location for use
Applicable
standards
Withstand
voltage
Insulation
resistance
Conductor Size
Dimension
Cable length
Output terminal
Weight
Accessories
Option
6. Specifications
23±5℃, relative humidity: 85% or less (no condensation)
0〜50℃, relative humidity: 85% or less (no condensation)
-20〜60℃, relative humidity: 85% or less (no condensation)
Altitude up to 2000m, Indoors
IEC 61010-1, IEC 61010-2-032
Measurement CAT.
Ⅲ
(300Vrms)
Pollution degree 2
IEC 61326-1 (EMC), EN50581 (Environmental standard)
Approx. 2m
Instruction manual
Cable marker
Approx. 510g
Approx. 240g
Approx. 150g
186(L) × 129(W) × 53(D)mm
128(L) × 81(W) × 36(D)mm
100(L) × 60(W) × 26(D)mm
Approx.68mm in diameter (max.)
Approx.40mm in diameter (max.)
Approx.24mm in diameter (max.)
AC3470Vrms (50/60Hz)for 5 sec.
between Jaw and enclosure
between enclosure and output terminal
between Jaw and output terminal
Approx. 60Ω
Approx. 100Ω
Approx. 90Ω
AC100Arms continuous (50/60Hz)
AC70Arms continuous (50/60Hz)
AC30Arms continuous(50/60Hz)
0A〜80A
±1.0%rdg±0.1mV (50/60Hz)
±2.0%rdg±0.2mV (40〜1kHz)
80A〜100A
±5.0%rdg (50/60Hz)
±10.0%rdg (45〜1kHz)
0A〜15A
±1.0%rdg±0.1mV (50/60Hz)
±2.0%rdg±0.2mV (40〜1kHz)
15A〜30A
±5.0%rdg(50/60Hz)
±10.0%rdg(45〜1kHz)
0A〜40A
±1.0%rdg±0.1mV (50/60Hz)
±2.0%rdg±0.2mV (40〜1kHz)
40A〜70A
±5.0%rdg (50/60Hz)
±10.0%rdg (45〜1kHz)
AC0 〜 100A
AC0 〜 70A
AC0 〜 30A
AC0〜5000mV
(50mV/A)
AC0〜3500mV
(50mV/A)
AC0〜1500mV
(50mV/A)
AC100Arms(141.4Apeak)
AC70Arms(99.0Apeak)
AC30Arms(42.4Apeak)
KEW 8148
KEW 8147
KEW 8146
MODEL 7146（Banana Φ4 adjuster plug）
MODEL 7185（Extension cable）
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