Note) When current is flowing from the upside to the underside of the instrument, reading is
po), on the contrary, reading to be negative(-) when current is flowing from the
underside to the upside of the instrument.
6-1-2 AC current measurement
(1) Set the function selector switch to "〜A" position.
("〜" and "A" marks will be displayed on the LCD.)
(2) Place one measured conductor lower than the triangle mark indicated on the fork shaped
sensor and make a measurement. (shaded part in the figure)
Then measured value is displayed on the LCD.
(When the center of the conductor is not lower than the triangle mark indicated on the fork
shaped sensor, error occurs.)
Note) For the measurement of AC current, zero adjustment, which is required for the
measurement of DC current, is not necessary. Current flowing direction has no relation to
the indication polarity.
6-2 Non contact voltage detection(NCV)
This function is to check the presence of voltage without touching wires or electrodes
directly.
Also can check the presence of AC voltage in cable, outlet, fuse and circuit breaker.
[Details]
While voltage is applied to a cable or outlet, the electric field depending on the voltage is
generated. This instrument detects the generated electric field, and verifies the presence of
AC voltage. Officially, it is called as an instrument for detecting electrical field. But it is not a
familiar term, so we call it as "Non contact voltage detection". General detectors detect
voltage by contacting polarized voltage(contacts and terminals). But this instrument is
developed to satisfy this function and for safety purpose without contacting voltage.
#
DANGER
● To avoid getting an electrical shock, never make measurement on the circuit in which
electrical potential over AC/DC300V exists.
● Before a measurement, be sure to check the instrument operation with well-known power
supply. If "Err" is displayed on the LCD, do not make a measurement.
●Do not make measurement with battery cover removed.
● Indication on NCV range is a reference value. Make sure to check the voltage with a
precise equipment in advance when operator will directly touch or connect wires.
● Indication of voltage may be affected by non-grounded metal tube or metal case, the
place where affected by other voltages, handgrip or the measuring position of sensor.
●Keep your fingers and hands behind the barrier during measurement.
6-2-1 Measurements
(1) Set the function selector switch to "NCV" position.
(2)
The sensing mode (100V or 200V) in effect is displayed on the LCD for 1min, and NCV
measurement starts.
(3) Position the tip part of fork typed sensor against the measured object.
When voltage is detected, "Hi" will be displayed on the LCD.
(Error could occur depending on the direction, angle and contact surface of the instrument
against the measured object. On NCV range, data hold function cannot be used.
)
Note)
When set the function selector switch to NCV range, self-check function operates and
Indicates "Err", if there is some fault or abnormal condition. Do not make a measurement if
such indication displayed on the LCD.
5. Preparation
(1) Check battery voltage
Set the Function selector switch to the position other than OFF position.
Battery Voltage is enough if indications are displayed clearly and "BATT" mark is not
displayed on the LCD. If "BATT" mark is indicated or no indication on the LCD, replace
batteries with new one according to battery replacement procedures shown in clause 8 in this
document.
#
CAUTION
● Indications may not being displayed on the LCD despite the function selector switch is at
the position other than OFF position.
This is because power-off function operated automatically and the instrument turned off.
Power off function can be released by turning the function selector switch to OFF, and
then set it to the range on which you would like to make a measurement.
If LCD still blank, batteries are completely exhausted. Please replace batteries.
(2) Check the function selector switch is set to the appropriate range. And also check data hold
function is not enabled. If inappropriate range is selected, desired measurement cannot be
made.
6. Measurements
6-1 Current Measurement
#
DANGER
● To avoid getting an electrical shock, never make measurement on the circuit in which
electrical potential over AC/DC300V exists.
●Do not make measurement with battery cover removed.
●Keep your fingers and hands behind the barrier during measurement.
#
CAUTION
●Max. diameter of measured object(conductor) is Φ10mm.
6-1-1 DC current measurement
(1) Set the function selector switch to "
A" position.
("
" and "A" marks will be displayed on the LCD.)
(2) Press HOLD/0ADJ button for 2sec or more to enable 0ADJ function and adjust the indication
on the LCD to be 0.
(Indication shall be adjusted to 0. Otherwise, error occurs.)
(3) Place one measured conductor lower than the triangle mark indicated on the fork shaped
sensor and make a measurement. (shaded part in the figure)
Then measured value is displayed on the LCD.
(When the center of the conductor is not lower than the triangle mark indicated on the fork
shaped sensor, error occurs.)
1. Safety Warnings
This instrument has been designed and tested according to IEC Publication 61010: Safety
Requirements for Electronic Measuring Apparatus. This instruction manual contains warnings
and safety rules which must be observed by the user to ensure safe operation of the
instrument and to retain it in safe condition. Therefore, read through these operating
instructions before starting using the instrument.
#
WARNING
● Read through and understand instructions contained in this manual before starting to use
the instrument.
●Save and keep the manual handy to enable quick reference whenever necessary.
●Be sure to use the instrument only in its intended applications.
●Be sure to understand and follow all safety instructions contained in the manual.
Be sure to observe above instructions.
Failure to follow the above instructions may cause injury, instrument damage and/or damage
to equipment under test.
The symbol
#
indicated on the instrument means that the user must refer to related parts
in the manual for safe operation of the instrument. Be sure to carefully read the
instructions following each
#
symbol in this 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.
Following symbols are used on the instrument and in the instruction manual. Attention should be
paid
to each symbol to ensure your safety.
Refer to the instructions in the manual.This symbol is marked where the user must refer to
the instruction manual
so as not to cause personal injury or instrument damage.
Indicates an instrument with double or reinforced insulation.
Indicates that this instrument can clamp on bare conductors when measuring
a
voltage
corresponding to the applicable Measurement category, which is marke
dnext to this symbol.
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
Indicates AC and DC.
#
DANGER
●Never make measurement on the circuit above AC/DC300V.
● 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.
●Never attempt to use the instrument if its surface or your hand is wet.
●Do not exceed the maximum allowable input of any measurement range.
●Do not open the battery cover and the instrument case when making measurement.
●
Never try to make measurement if any abnormal conditions, such as broken
Transformer
jaws or case is noted.
●
The instrument is to be used only in its intended applications or conditions. Otherwise,
safety functions equipped with the instrument doesn t work, and instrument damage
or
serious personal injury may be caused.
#
WARNING
● Never attempt to make any measurement, if the instrument has any structural abnormality
noted, such as cracked case or exposed metal parts.
● Do not install substitute parts or make any modification to the instrument. Return the
instrument to Kyoritsu or your distributor for repair or re-calibration.
●Do not try to replace the batteries if the surface of the instrument is wet.
● Always switch off the instrument before opening the battery compartment cover for battery
replacement.
#
CAUTION
● Always make sure to check the function selector switch is set to the appropriate range
before starting measurement.
●Do not expose the instrument to the direct sun, high temperature and humidity or dewfall.
● Be sure to set the function selector switch to the "OFF" position after use. When the
instrument will not be in use for a long period, place it in storage after removing the batteries.
● Use a cloth dipped in water or neutral detergent for cleaning the instrument. Do not use
abrasives or solvents
Fork Jaws
Barrier
Function Selector Switch
Data Hold / Zero Adjustment Button
Hand Strap
Display
Low Battery Warning
AC/DC
NCV Range
Data Hold Mode
Unit
Fork Jaws
Barrier
Function Selector Switch
Data Hold / Zero Adjustment Button
Hand Strap
Display
Low Battery Warning
AC/DC
NCV Range
Data Hold Mode
Unit
Place the center of the
measured conductor lower
than the triangle mark indicated
on the fork shaped sensor.
(shaded part in the figure)
IEC61326 (EMC standard)
EN 50581 (RoHS)
●Indication
LCD Max. 1049 units, symbols
●Over range display
"OL" symbol is displayed on the LCD.
(Only on current range)
●Response time
Approx. 2sec.
●Sampling rate
Approx. twice per second
●Location for use
Indoor use, Altitude up to 2000m
●Temperature &
Humidity range
(guaranteed accuracy)
23℃±5℃
Relative humidity: 75% or less (no condensation)
●Operating Temperature &
Humidity range
0 〜 40℃
Relative humidity: 85% or less (no condensation)
●Storage Temperature &
Humidity range
-20 〜 60℃
Relative humidity: 85% or less (no condensation)
●Power source
DC3V : R03(UM-4)x2pcs
●Current consumption
Approx.12mA or less
To decrease current consumption, detecting circuit is on only for
0.1/0.5sec.
●Power off function
Power off function operates automatically after a switch remains
for 10min.
●Overload Protection
AC/DC current : AC/DC 120A/ 10sec.
AC voltage (NCV) : AC360V/ 10sec.
●Withstand Voltage
AC3470V for Five sec.
(Between electrical circuit and enclosures.)
●Insulation Resistance
10MΩ/1000V
(Between electrical circuit and enclosures.)
●Max. diameter of
measured object
Max. 10mm
●Dimensions
161.3(L) x 40.2(W) x 30.3(D) mm
●Weight
110g(including batteries)
●Accessories
Battery R03 --------------------- 2
Instruction manual ------------ 1
Carrying case ------------------- 1
Reference
*Effective Value (RMS)
Most alternating currents and voltages are expressed in effective values, which are also referred
to as RMS (Root-Mean-Square) values. The effective value is the square root of the average of
square of alternating current or voltage values. Many clamp meters using a conventional
rectifying circuit have "RMS" scales for AC measurement. The scales are, however, actually
calibrated in terms of the effective value of a sine wave though the clamp meter is responding to
the average value. The calibration is done with a conversion factor of 1.111 for sine wave, which
is found by dividing the effective value by the average value. These instruments are therefore in
error if the input voltage or current has some other shape than sine wave.
*CF (Crest Factor) is found by dividing the peak value by the effective value.
Examples:
Sine wave: CF=1.414
Square wave with a 1: 4 duty ratio: CF=2
3. Specification
AC current 〜 A
DC current
A
AC voltage 〜 V
Note) NCV range is calibrated to detect the voltage, where non-grounded single wire, AC80V or
more. However, detecting sensitivity may be affected by the absence of grounded or non-
grounded metal tube or metal case. Also it may be affected in the place where influenced
by other voltages, how you grip the instrument or the measuring position of sensor.
● CF(Crest Factor)
CF=2.5 or less
● Standards
IEC61010-1
Measurement CATIII 300V, pollution degree 2
IEC61010-2-032
Instruction Manual
6-2-2 Sensing mode
●There are two types of sensing mode: 100V mode and 200V mode.
● Above two modes can be changed over by pressing the data hold button 2sec or more.
(The selected sensing mode is stored even if switching off the instrument. When setting the
function switch to "NCV" again, measurement can be done on the same mode.)
●Factory setting : 200V mode
(1) 100V mode
Sensitivity on this mode is set sharp, therefore, the presence of AC voltage can be checked
only by placing the instrument closer to the measured object, such as an outlet, a plug and
parallel cords, as shown in figure.
(2) 200V mode
Sensitivity on this mode is set dull, so the earth side and non-earth side of 100V cable way
can de verified. (Where cables are crowded, such as in a distribution board, earth side could
not be verified.)
Also can check the presence of AC voltage in 200V cable way, plug, outlet, fuse and circuit
breaker.
7. Other functions
7-1 Auto power off function
This function causes the instrument to automatically enter the power-off mode about 10min
after the last function selector switch operation.
To release the power-off function, turn off the instrument and then turn on again.
7-2 Data hold function (Only on ACA/DCA range)
This is a function to hold the measured value on the LCD. "H" mark is shown on the LCD
while the instrument is in the data hold mode. To exit the data hold mode, press the data hold
button again.
Note)
The measured value being held will be released when auto power-off function operates
while data hold function is operating.
8. Battery replacement
#
WARNING
● To avoid getting electrical shock, be sure to set the function selector switch to "OFF"
position before trying to replace the batteries.
#
CAUTION
●Do not mix new and old batteries.
●Make sure to install battery in correct polarity as indicated inside the battery cover.
When "BATT" mark is shown on the upper left corner of the LCD, replace the batteries.
Note that the battery is completely exhausted, the LCD blanks without "BATT" mark shown.
(1) Set the function selector switch to "OFF" position.
(2)
Unscrew the battery cover fixing screws and remove the battery cover on the bottom of the
instrument. Then replace new batteries. (R03 x 2pcs)
Range
ACA
Measuring range
０〜100A
Accuracy
±2.0％rdg±５dgt（50／60Hz）
±3.0％rdg±５dgt（50／60Hz）
CF(Crest factor)
CF≦２
２＜CF≦2.5
Range
DCA
Measuring range
０〜±100A
Accuracy
±2.0％rdg±５dgt
Range
NCV
Measuring range
AC300V or less
Action
Normal condition : Lo
At voltage detecting(single wire AC80V or more) : Hi
92-1556E
8-16
4. INSTRUMENT LAYOUT
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or
designs described in this manual without notice and without
obligations.
AC/DC FORK CURRENT TESTER
KEW 2300R
KEW FORK
Co
rre
ct
Wrong
2. Features
● This instrument, Fork current tester, can measure AC/DC current up to 100A without opening
and closing the Jaws.
●True RMS reading for AC current
●Fork shaped sensor for easy measurement at tight places and crowded cable areas.
●NCV function (Non Contact Voltage) enables live wire check
●Auto power off function
●Data hold function
●Pocket size handy tester, adopted over-molding for a better fit
●Carrying case furnished as a standard accessory.
● Designed to international safety standards.
IEC 61010-2-032 measurement CAT.III 300V Pollution degree 2
○ 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).
O: Device which is
not directly
connected to the
mains power supply
Barrier : It is a part providing protection against electrical shock and ensuring the minimum
required air and creepage distances.
KYORITSU ELECTRICAL INSTRUMENTS
WORKS, LTD.
#
