KYORITSU KEW FORK Instruction Manual

Instruction Manual
AC/DC FORK CURRENT TESTER
KEW FORK
KEW 2300R
KYORITSU ELECTRICAL INSTRUMENTS
WORKS, LTD.
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or
designs described in this manual without notice and without
obligations.
10-22
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
● R ead 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.
●The instrument is to be used only in its intended applications.
●Understand and follow all the safety instructions contained in the manual.
Failure to follow the instructions may cause injury, instrument damage and/or damage to
equipment under test. Kyoritsu is by no means liable for any damage resulting from the
instrument in contradiction to this cautionary note.
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 i s reserved for conditions and actions that are likely to cause serious or fatal
injury.
# W ARNING i s reserved for conditions and actions that can cause serious or fatal injury.
# C AUTION i s 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
corresponding to the applicable Measurement category, which is marke
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
Indicates AC and DC.
This instrument satisfies the marking requirement defined in the WEEE Directive (2002/96/
EC). This symbol indicates separate collection for electrical and electronic equipment.
# DANGER
●Never make measurement on the circuit above AC/DC300V.
● D o 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.
● N ever try to make measurement if any abnormal conditions, such as broken
or case is noted.
● T he instrument is to be used only in its intended applications or conditions. Otherwise,
functions equipped with the instrument doesn t work, and instrument damage
personal injury may be caused.
● K eep your fingers and hands behind the Barrier during measurement.
# WARNING
● N ever attempt to make any measurement, if the instrument has any structural abnormality
noted, such as cracked case or exposed metal parts.
● D o 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.
● A lways switch off the instrument before opening the battery compartment cover for battery
replacement.
# CAUTION
● A lways 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.
● B e 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.
● U se a cloth dipped in water or neutral detergent for cleaning the instrument. Do not use
Fork Jaws
abrasives or solvents
Barrier
4. INSTRUMENT LAYOUT
Function Selector Switch
Display
Fork Jaws AC/DC
Low Battery Warning
Hand Strap
NCV Range
Barrier
Data Hold / Zero Adjustment Button
Barrier : I t is a part providing protection against electrical shock and ensuring the minimum
required air and creepage distances.
5. Preparation
AC/DC
Data Hold Mode
(1) Check battery voltage
Low Battery Warning
S et the Function selector switch to the position other than OFF position.
B attery Voltage is enough if indications are displayed clearly and "BATT" mark is not
NCV Range
displayed on the LCD. If "BATT" mark is indicated or no indication on the LCD, replace
Unit
batteries with new one according to battery replacement procedures shown in clause 8 in this
document.
# CAUTION
● I ndications may not being displayed on the LCD despite the function selector switch is at
the position other than OFF position.
T his is because power-off function operated automatically and the instrument turned off.
P ower 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) C heck 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
● T o 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.
Co ct Wrong
rre
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) P ress 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) P lace 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.)
92-1556H
○ Measurement Category
T o 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 : C ircuits which are not directly connected to the mains power supply.
CAT II : E lectrical circuits of equipment connected to an AC electrical outlet by a power
cord.
CAT III : P rimary electrical circuits of the equipment connected directly to the distribution
panel, and feeders from the distribution panel to outlets.
CAT IV : T he circuit from the service drop to the service entrance, and to the power meter
and primary over-current protection device (distribution panel).
2. Features
● T his instrument, Fork current tester, can measure AC/DC current up to 100A without opening
and closing the Jaws.
●True RMS reading for AC current
a voltage
●Fork shaped sensor for easy measurement at tight places and crowded cable areas.
dnext to this symbol.
●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.
● D esigned to international safety standards.
IEC 61010-2-032 measurement CAT III 300V Pollution degree 2
3. Specification
AC current 〜 A
Range Measuring range
±2.0％rdg±５dgt（50／60Hz）
ACA ０〜100A
Transformer jaws
±3.0％rdg±５dgt（50／60Hz）
safety
DC current A
or serious
Range Measuring range
DCA ０〜±100A
AC voltage 〜 V
Range Measuring range Action
NCV AC300V or less Normal condition : Lo
At voltage detecting(single wire AC80V or more) : Hi
Note) N CV 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
Function Selector Switch
Measurement CATIII 300V, pollution degree 2
Display
IEC61010-2-032
Hand Strap
Data Hold / Zero Adjustment Button
Note) W hen current is flowing from the upside to the underside of the instrument, reading is
positive(+), 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
Data Hold Mode
(1) Set the function selector switch to "〜A" position.
("〜" and "A" marks will be displayed on the LCD.)
(2) P lace one measured conductor lower than the triangle mark indicated on the fork shaped
sensor and make a measurement. (shaded part in the figure)
Unit
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) F or 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)
T his 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]
W hile 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.
● T o avoid getting an electrical shock, never make measurement on the circuit in which
electrical potential over AC/DC300V exists.
● B efore 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.
● I ndication 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.
● I ndication 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) T he 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
Place the center of the
Indicates "Err", if there is some fault or abnormal condition. Do not make a measurement if
measured conductor lower
such indication displayed on the LCD.
than the triangle mark indicated
on the fork shaped sensor.
(shaded part in the figure)
●Environmental standards EU RoHS directive compliant
●Indication
●Over range display
●Response time
●Sampling rate
●Location for use
●Temperature &
Humidity range
(guaranteed accuracy)
●Operating Temperature &
Humidity range 0 〜 40℃
●Storage Temperature &
Humidity range -20 〜 60℃
O: Device which is
●Power source
not directly
●Current consumption
connected to the
mains power supply
●Power off function
●Overload Protection
●Withstand Voltage
●Insulation Resistance
●Max. diameter of
measured object
●Dimensions
●Weight
●Accessories
Accuracy CF(Crest factor)
CF≦２
２＜CF≦2.5
Accuracy
±2.0％rdg±５dgt
*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
6-2-2 Sensing mode
●There are two types of sensing mode: 100V mode and 200V mode.
● A bove 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
S ensitivity 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
S ensitivity 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.)
A lso 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
T his 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)
# DANGER
T his 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) T he measured value being held will be released when auto power-off function operates
while data hold function is operating.
8. Battery replacement
● T o avoid getting electrical shock, be sure to set the function selector switch to "OFF"
position before trying to replace the batteries.
●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) U nscrew the battery cover fixing screws and remove the battery cover on the bottom of the
instrument. Then replace new batteries. (R03 x 2pcs)
IEC61326-1 (EMC standard)
LCD Max. 1049 units, symbols
"OL" symbol is displayed on the LCD.
(Only on current range)
Approx. 2sec.
Approx. twice per second
Indoor use, Altitude up to 2000m
23℃±5℃
Relative humidity: 75% or less (no condensation)
Relative humidity: 85% or less (no condensation)
Relative humidity: 85% or less (no condensation)
DC3V : R03(UM-4)x2pcs
Approx.12mA or less
T o decrease current consumption, detecting circuit is on only for
0.1/0.5sec.
P ower off function operates automatically after a switch remains
for 10min.
AC/DC current : AC/DC 120A/ 10sec.
AC voltage (NCV) : AC360V/ 10sec.
AC3470V for Five sec.
(Between electrical circuit and enclosures.)
10MΩ/1000V
(Between electrical circuit and enclosures.)
Max. 10mm
161(L) x 40(W) x 30(D) mm
110g(including batteries)
Battery R03 ---------------------- 2
Instruction manual ------------- 1
Carrying case M-9113 -------- 1
Reference
# WARNING
# CAUTION