Instruction Manual
DC Milliamp Clamp Meter
KEW 2500
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.
● Read through and understand the 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.
● 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, 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 these cautionary notes.
○ 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
# WARNING : is reserved for conditions and actions that can
# CAUTION : is reserved for conditions and actions that can
Please refer to following explanation of the symbols used on the
instrument and in this manual.
User must refer to the explanations in the instruction
#
manual.
Instrument with double or reinforced insulation
Application around hazardous live conductors is NOT
permitted.
Crossed-out wheel bin symbol (according to WEEE
Directive: 2002/96/EC) indicating that this electrical product
may not be treated as household waste, but that it must be
collected and treated separately.
# WARNING
likely to cause serious or fatal injury.
cause serious or fatal injury.
cause injury or instrument damage.
● Never make measurements on a circuit in which earth
potentials of 300V or higher exist.
● Do not attempt to make measurements 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
measuring range.
● Never open the Battery compartment cover during a
measurement.
● Never attempt to make any measurements if the clamp
sensor and/or the instrument has any structural abnormality,
such as a crack, or if the cover is not securely attached.
● Do not measure AC currents.
● The instrument should be used only in its intended
applications or conditions. Otherwise, safety functions
equipped with the instrument do not work, and instrument
damage or serious personal injury may be caused.
● Never attempt to make any measurements if any abnormal
conditions, such as a broken cover or exposed metal parts
are present on the instrument and clamp sensor.
● Do not install substitute parts or make any modifications
to the instrument. Return the instrument to your local
KYORITSU distributor for repair or re-calibration in case of
suspected faulty operation.
● Do not try to replace the batteries if the surface of the
instrument is wet.
● Ensure that the Clamp sensor is disconnected from the
object under test, and that the instrument is powered off
when opening the Battery compartment cover for battery
replacement.
● Do not expose the instrument to direct sunlight, high
temperature, humidity or dew.
● This instrument is not water/ dustproof. Do not use it in a
dusty environment or where it will get wet.
● Always power off the instrument after use. Remove the
batteries if the instrument is to be stored and will not be in
use for a long period.
● Use a damp cloth with neutral detergent or water for cleaning
the instrument. Do not use abrasives or solvents.
# DANGER
# WARNING
# CAUTION
○ 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
overcurrent protection device (distribution panel).
Incoming wire
Socket
Interior wiring
Device which is
Ｏ:
not directly
connected to the
mains power supply
2. Feature
● Instrumentation signal (DC4–20mA) measurement
● DC current (0-100mA) measurement without breaking the
electrical circuit.
● LED light for illuminating the measurement spot
● Auto-power-off function
● Percentage span
● Analog output function to output the measured results to the
recorder or digital multi-meter.
● Data hold function
3．Specification
● Measuring range and accuracy (23ºC±5ºC, RH 75% or less)
(1) DC current (auto-range)
Range Display range
20mA 0.00 to ±21.49mA 0.00 to ±21.49mA ±0.2%rdg±5dgt After Zero-
100mA ±21.0 to ±126.0mA ±21.0 to ±120.0mA ±1.0%rdg±5dgt
(2) Analog output function
To output DC voltage (10mV/mA) corresponding to the
reading.
Range Display range Output voltage Accuracy
20mA 0.00 to ±21.49mA 0.0 to ±214.9mV Accuracy specified at clause 3
100mA ±21.0 to ±126.0mA ±210 to ±1260mV Accuracy specified at clause 3
* 1300mV is output when the display shows OL. (-1300mV for
-OL.)
See clause 6 for explanations on OL display.
* Output impedance : approx. 5kΩ
● Applicable
standards
● Display Liquid crystal display
● Refresh rate approx. once/ 0.6 second
● Location for use In-door use, altitude 2000m or less
●
Operating tempera-
ture & humidity
●
Storage tempera-
ture & humidity
● Power source size AA battery x 4 pcs
● Battery life approx. 60 hours continuous (with Backlight
● Auto-power-off Power off function operates in 10 min. after
Guaranteed
accuracy
IEC61010-1, IEC61010-2-030
Measurement CAT.II 300V Pollution degree 2
IEC61010-2-032
IEC61326 (EMC)
IEC60529 IP40
EN50581 (RoHS)
(see also 4. Instrument layout)
-10 to +50℃ RH85％ or less (no condensation)
-20 to +60℃ RH85％ or less (no condensation)
(The use of alkaline LR6 is recommended.)
and LED light OFF)
the last switch operation. This function is
disabled when a cord is being connected to
the OUTPUT terminal.
Accuracy Condition
Adjustment
described at
clause 6 (1)
(1) plus (±0.5mV)
(1) plus (±3mV)
DISTRIBUTOR
Kyoritsu reserves the rights to change specifications or designs
described in this manual without notice and without obligations.
● Temperature
coefficients
Withstand voltage
●
Insulation resistance
●
● Conductor size max. Ф6mm
● Dimension 111(L) x 61(W) x 40(D)mm
● Weight approx. 290g (including batteries)
● Accessory Soft case MODEL9096 x 1 pce
●
Optional accessory
Add 0.1 x specified accuracy/ ºC
(above 28ºC or below 18ºC)
AC2210V for 5 sec
(between electrical circuit and enclosure)
100MΩ or more/ 1000V
(between electrical circuit and enclosure)
Size AA Alkaline battery LR6 x 4 pcs
Instruction manual (Japanese/ English) x 1 pce
Analog output cord MODEL7256
4．Instrument layout
Main unit
Light button
DISP button
(to switch displays)
LED light
LCD
Zero ADJ.
button
Power button
Data hold button
Battery level indicator
Hold mark
Clamp sensor
Analog output
terminal
LCD
Transformer Jaws
Polarity mark
Barrier
Trigger
Zero ADJ. mark
Sub display
Main display
5．Getting started
(1) Power on the instrument, and then check smooth opening and
closing of clamp sensor.
(2) Check the remaining battery level before making a measure-
ment. Press the Power button and get the instrument started.
When the battery empty indicator appears in the LCD, please
replace the batteries with new ones according to 8. Battery
replacement in this manual.
(3) Ensure that the Data hold function is not in active status.
6．Operating instructions
● Do not clamp onto the un-insulated conductor.
● Always use the dedicated analog output cord MODEL 7256
when utilizing the analog output function.
● Keep your fingers and hands behind the barrier during a
measurement.
● To avoid false reading, check that the Clamp sensor is clean
before starting to use the instrument.
● Bring the Clamp sensor close to the conductor under test
and zero adjust the display in order to minimize the influence
of electromagnetic waves.
● Take sufficient care to not to apply shock, vibration or
excessive force when opening and closing the clamp sensor.
Otherwise, accurate measured results may not be obtained.
Please open and close the sensor lightly.
(1) Zero Adjustment
Perform zero adjustment prior to starting a measurement. With
the transformer jaws closed and without clamping them onto the
conductor, press the Zero ADJ. button.
Then the Zero adjustment mark
about one second.
(2) Measurement
Press the Jaw trigger to open the transformer jaws and clamp
them onto the conductor under test and take the reading on the
display. (See the figure below.)
When the current flows in the
same direction as indicated by
the arrow mark on the jaws, the
polarity of the reading is positive
and vice versa.
* %(Span) display
The sub-display shows percentage value as the basis of 4mA is
0% and 20mA is 100%. (at 20mA Range only) The percentage is
displayed on the main display by pressing the DISP button. In this
case, the current value is displayed on the sub-display.
# WARNING
# DANGER
# CAUTION
is shown on the LCD for
correct wrong
The table at the right shows the
relationship between %(Span)
values and the measured values
(mA).
The percentage value is
calculated based on the following
formula, assuming the measured
value as X.
Percentage = （|X| - 4.00）×6.25
* Over-limit indication
When the input exceeds the max measuring range (126.0mA),
"OL" or -OL (for negative values) is indicated on the display.
When the Range reaches to the 100mA, bars (---) are displayed
instead of the percentage value.
Measured values (mA） Percentage display (%)
−20.00 100.0
0.00 −25.0
2.00 −12.5
4.00 0.0
12.00 50.0
20.00 100.0
100.0 −−−
7．Other functions
7.1 Data Hold Function
This is a function to freeze the measured value on the display.
Press the Data hold button once to freeze the reading. The
reading will be held regardless of subsequent variation in input.
The Data hold mark "
instrument is in the Data Hold mode. To exit Data Hold mode,
press the Data hold button again.
7.2 Auto-power-off function
The instrument automatically powers off about 10 min after the
last operation. This function is disabled while the cord is being
connected to the analog output terminal. To disable this function
at all times, hold down the Data hold button while powering on the
instrument. The LCD shows P.oFF for about 1 sec immediately
after powering on the instrument. To restore this function, power
off once and power on again.
7.3 Backlight & LED light
Press the Light button to turn on or off the LED light and LCD
backlight. These lights automatically turn off after two minutes.
To disable the automatic light timeout, hold down the Light button
while powering on the instrument. The LCD shows L.oFF for
about 1 sec immediately after powering on the instrument. To
restore this function, power off once and power on again.
7.4 Analog output function
DC voltage signal corresponding to the measured result is output
from the Analog output terminal. (10mV/mA) It can be checked on
a recorder or a digital multi-meter connected to the instrument by
using MODEL7256 output cord.
" is indicated on the display while the
* When connecting the Analog output cord to the instrument, the
sub-display shows OUT for 1 sec.
When making measurements for long periods of time:
- leave the instrument for the warm-up period of several tens of
minutes after powering it on, and then start a recording.
- readings will vary when the ambient temperature changes. In
this case, the temperature coefficients specified at clause 3 and
fluctuations at zero (about 20 counts fluctuate when temperature
changes by 10ºC) should be taken into consideration.
To digital multimeter or recorder
Analog output
cord M-7256
8．Battery replacement
● Ensure that the Clamp sensor is disconnected from the
object under test, and that the instrument is powered off
when opening the Battery compartment cover for battery
replacement.
● Do not mix new and old batteries or mix different types of
batteries.
● Install batteries in correct polarity as marked inside.
Replace batteries with the new
ones when the empty battery mark
is displayed on the LCD.
The LCD does not show anything,
even the empty battery mark,
when the batteries are completely
exhausted.
[ How to replace batteries ]
(1) Power off the instrument.
(2) Loosen the screw at the backside of the instrument and
remove the Battery compartment cover.
(3) Remove all the old batteries and install new ones, four size
AA batteries, in correct polarity. The use of alkaline batteries
(LR6) is recommended.
(4) Reattach the Battery compartment cover and tighten the
screw.
# WARNING
# CAUTION
Battery
compartment
cover
Screw
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