INSTRUCTION MANUAL The symbol # indicated on the instrument means ◦Always make sure to insert each plug of the

◦Always make sure to insert each plug of the test ◦Overrange Indication :
AC/DC DIGITAL CLAMP METER that the user must refer to related parts in the leads fully into the appropriate terminal on the “OL.”is shown on the display

KT203
manual for safe operation of the instrument. Be instrument. ◦Response Time :
sure to carefully read the instructions following ◦Make sure to remove the test leads from the
each # symbol in this manual. Approx. 2 seconds
instrument before making current measurement.
◦Do not expose the instrument to the direct sun, ◦Sample Rate : 
#DANGER is reserved for conditions and actions extreme temperatures or dew fall. About 2.5 times per second
that are likely to cause serious or fatal injury. ◦Be sure to set the function selector switch to the ◦Temperature and Humidity for Guranteed Accuracy:
#WARNING is reserved for conditions and “ ”position after use. When the instrument will 23 ± 5℃ , relative humidity up to 85%
Transformer Jaws actions that can cause serious or fatal injury. not be in use for a long period of time, place it in without condensation
#CAUTION is reserved for conditions and actions storage after removing the battery.
Barrier that can cause minor injury or instrument damage. ◦Use a damp cloth and detergent for cleaning the ◦Operating Temperature and Humidity :
instrument. Do not use abrasives or solvents. 0〜40℃ , relative humidity up to 85%
Following symbols are used on the instrument and ◦This instrument isn't dust & water proofed. Keep without condensation
in the instruction manual. Attention should be paid away from dust and water. ◦Storage Temperature and Humidity :
Trigger Data Hold and 0 ADJ. Switch to each symbol to ensure your safety. -20〜60℃ , relative humidity up to 85%
Working voltage is specified according to each
Refer to the instructions in the manual. Measurement category, which is defined in safety standards.   without condensation
# This symbol is marked where the user must It is to protect the user from transient impulse, which ◦Power Source : 
Function Selecter Switch refer to the instruction manual so as not to presents in the circuit under test. Measurement Two R03 or equivalent （DC1.5V）batteries
cause personal injury or instrument damage. categories are defined as follows. ◦Current Consumption :
Indicates an instrument with double or CAT Ⅱ : Primary electrical circuits of equipment
 reinforced insulation. Approx. 15mA max. (ACA, DCA Range)
connected to an AC electrical outlet by a Approx. 5mA max. (ACV, DCV, Ω Range)
Display Indicates that this instrument can clamp on power cord.
bare conductors when measuring a voltage CAT Ⅲ : Primary electrical circuits of the equipment ◦Sleep Function : 
corresponding to the applicable Measurement connected directly to the distribution panel, and Automatically powered down in about 10
category, which is marked next to this symbol. feeders from the distribution panel to outlets. minutes after the last switch operation（power
COM Terminal V/Ω Terminal Indicates AC and DC. CAT Ⅳ : The circuit from the service drop to the consumption in the sleep mode is about 35μA.）
 Indicates Earth. service entrance, and to the power meter ◦Standards :
and primary over-current protection device IEC61010-1
Barrier:It is a part providing protection against # DANGER (distribution panel).
CAT.III 300V AC, pollution degree 2
electrical shock and ensuring the minimum ◦Never make measurement on a circuit with a
required air and creepage distances. voltage higher than 600 V AC/DC. 3. Specifications CAT.II 600V AC/DC, pollution degree 2
◦Do not attempt to make measurement in the Measuring Ranges and Accuracy IEC61010-2-030
presence of flammable gasses, fumes, vapor or （at 23 ± 5℃ , 45-75% relative humidity） IEC61010-031
1. Features AC Current
（A）Auto-ranging (50/60Hz)
◦Safety design conforming to the following provi- dust. Otherwise, the use of the instrument may IEC61010-2-032
sions of IEC61010. cause sparking, which can lead to an explosion. Range Measuring Range Accuracy ◦Overload Protection : 
 Measurement category III 300V AC, pollution ◦Transformer jaws are made of metal and 40A 0-40.00A ±3.0%rdg±8dgt
their tips are not insulated. Where equipment AC current ranges : 480A AC/DC for 10sec
degree 2 15.0-299.9A ±3.5%rdg±6dgt AC voltage ranges : 720V AC/DC for 10sec
 Measurement category II 600V AC/DC, pollution under test has exposed conductive parts, 400A
degree 2 be especially careful to avoid the hazard of 300.0-400.0A ±4.0%rdg±6dgt Resistance ranges : 300V AC/DC for 10sec
possible shorting. ◦Operating Environmental Conditions :
◦Protected throughout by double or reinforced ◦Never attempt to use the instrument if its DC Current
（A）Auto-ranging
insulation, indicated the International Electrical Range Measuring Range Accuracy Indoor use, Altitude up to 2000m
surface or your hand is wet.
Symbol ""on the bottom of the instrument. ◦Do not exceed the maximum allowable input of ◦Withstand Voltage : 
◦Data hold switch for easy reading in dimly light or 40A 0-40.00A ±3.0%rdg±8dgt
any measurement range. 3470VAC （RMS,50/60Hz） for 5 secound 
hard-to-read locations. ◦Never open the battery compartment cover 15.0-299.9A ±3.5%rdg±6dgt between electrical circuit and housing case
◦“Sleep”feature to extend battery life. 400A
when making measurement. 300.0-400.0A ±4.0%rdg±6dgt ◦Insulation Resistance
◦Beeper permits easy continuity check.
◦Provides a dynamic range of 4,000 counts full AC Voltage
（V）Auto-ranging (50/60Hz) 10M Ω or greater at 1000V between elect-
# WARNING rical circuit and housing case
scale. ◦Never attempt to make any measurement if any Range Measuring Range Accuracy
2. Safety Warnings abnormal conditions are noted, such as broken 400V 0-400.0V ◦Conductor Size : 
◦This instruction manual contains warnings and case, cracked test leads and exposed metal part. ±2.0%rdg±5dgt Approx. 30 mm diameter max
600V 150-600V
safety rules which must be observed by the user ◦Do not turn the function selector switch with ◦Dimensions :
to ensure safe operation of the instrument and plugged in test leads connected to the circuit DC Voltage
（V）Auto-ranging 187 （L） x 68.5
（W） x 38.5
（D） mm
retain it in safe condition. Therefore, read through under test. Range Measuring Range Accuracy ◦Weight :
these operating instructions before using the ◦Do not install substitute parts or make any
modification to the instrument. Return the 400V 0-400.0V Approx. 200g （including batteries）
instrument. ±1.5%rdg±5dgt
instrument to your distributor for repair or 600V 150-600V ◦Accessories :
# WARNING recalibration. Resistance
（Ω /Continuity）Auto-ranging Test leads
◦Read through and understand instructions ◦Do not try to replace the batteries if the surface （Buzzer beeps below 50±35Ω） Two R03 batteries
contained in this manual before using the of the instrument is wet. Instruction manual
instrument. ◦Always switch off the instrument before opening Range Measuring Range Accuracy
◦Save and keep the manual handy to enable the battery compartment cover for battery 400Ω 0-400.0Ω
quick reference whenever necessary. replacement. ±2.0%rdg±5dgt 4. Preparation for Measurement
◦Verify proper operation on a known source
4000Ω 150-4000Ω 4-1 Checking Battery Voltage
◦Be sure to use the instrument only in its before use or taking action as a result indication
intended applications and to follow mea- ◦Operating System : Set the function selector switch to any position
of the instrument.
surement procedures described in the manual. Dual Integration other than
“ ” . When the display is clear without
◦The instrument is to be used only in its intended ◦Display : “ ”showing, proceed to measu-rement.
applications or conditions. Otherwise, safety # CAUTION
◦Make sure that the function selector switch is Liquid crystal display When the display blanks or “ ”is indicated,
functions equipped with the instrument doesn’
t （maximum count: 4199） replaces the batteries according to the instructions
work, and instrument damage or serious set to the appropriate position before making
personal injury may be caused. measurement. ◦Low Battery Warning : described in section 9. Battery Replacement.
“ ”is shown on the display

NOTE NOTE 9. Battery Replacement

NOTE
The sleep feature automatically turns the instru- When current flows from the upside to the ◦When shorting the test lead prods together, # WARNING
ment off in a certain period of time after the last underside of the instrument, the polarity of the the display may show a very small resistance To avoid electric shock hazard, make sure to set
switch operation. Therefore, the display may reading is positive (+). Othewise, the polarity of instead of "0." This is the resistance of the test the function selector switch to "OFF" and remove
be blank with the function selector switch set the reading is negative (-). leads. the test leads from the instrument before trying to
to a position other than“ ” . To operate the ◦If one of the test leads has an open, the display replace the batteries.
instrument in this case, set the switch back to 6. Voltage Measurement reads "OL."
the“ ”position, then to the desired position, # CAUTION
or press any switch. If the display still blanks, the # DANGER
◦Never use the instrument on a circuit with a ◦Do not mix new and old batteries
batteries are exhausted. Replace the batteries. 8. Other Functions ◦Make sure to install battery in correct polarity as
voltage higher than 600 VAC/DC. Otherwise, 8-1 Sleep Function
4-2 Checking Switch Setting and Operation electric shock hazard or damage to the indicated inside the battery compartment.
Make sure that the function selector switch is set instrument or the circuit under test may result. NOTE When“ ”is shown on the display, replace
to the correct position and the data hold switch ◦Do not make measurement with the battery The instrument still consumes small amount of the batteries. Note that when the battery is
is deactivated. Otherwise, desired measurement compartment cover removed. battery power in the sleep mode. Make sure to
cannot be made. completely exhausted, the display blanks without
◦Keep your fingers and hands behind the barrier set the function selector switch to the "OFF" “ ”shown.
5. Current Measurement during measurement. position after use.
  # WARNING 6-1 AC Voltage Measurement (1) Sleep Mode
◦Do not make measurement on a circuit with a （1）Set the function selector switch to the This is a function to prevent the instrument
voltage higher than 600 V AC/DC. Otherwise, “ACV”position from being left powered on in order to conserve Ｂ
shock hazard or damage to the instrument or （2）Plug the red test lead into the V/Ω terminal battery life. This function causes the instrument to Ａ
equipment under test may result. automatically enter the sleep (powered down) mode Ｔ
◦Transformer jaw tips are designed to minimize and the black test lead into the COM
the possibility of shorting conductors in the terminal. about 10 minutes after the last switch or button
circuit under test. If equipment under test has （3）Connect the test lead prods to the circuit operation. (1) Set the function selector switch to the "OFF"
exposed conductive parts, however, extra under test and take the reading on the To exit the sleep mode, turn the function selector position.
precaution should be taken to avoid possible
display. switch back to "OFF", then to any other position, or (2) Unscrew and remove the battery compartment
shorting. press any button.
◦Do not make measurement with the battery 6-2 DC Voltage Measurement on the bottom of the instrument.
compartment cover removed. （1）Set the function selector switch to the (3) Replace the batteries observing correct
◦Do not make current measurement with the test (2) How to disable the sleep mode polarity. Use two new R03 or equivalent
leads connected to the instrument. “DCV”position To disable the sleep mode, Power the instrument batteries.
◦It is a part providing protection against electrical （2）Plug the red test lead into the V/Ω terminal on with the data hold switch pressed. "P.OFF" is
shock and ensuring the minimum required air (4) Mount and screw the battery compartment
and the black test lead into the COM shown on the display for about 3 seconds after the cover.
and creepage distances. Keep your fingers and terminal. instrument is powered on.
hands behind the barrier during measurement. To enable the sleep mode, power the instrument
（3）Connect the test lead prods to the circuit
NOTE under test and take the reading on the off, then power it on without pressing the data hold
◦During current measurement, keep the trans- display. switch.
former jaws fully closed. Otherwise, accurate
7. Resistance Measurement 8-2 Data Hold Function
measurement cannot be made. The maxi-mum Battery Compartment
conductor size is 30 mm in diameter. This is a function used to freeze the measured
# DANGER
◦When measuring a larger current, the trans- value on the display. Press the data hold switch
◦Always make sure that the circuit under test is to freeze the reading. The reading will be held
former jaws may buzz. This does not affect the powered off.
instrument's accuracy. regardless of subsequent changes in input. " " is
◦Do not make measurement with the battery shown on the upper left corner of the display while
1.5V

1.5V

5-1 AC Current Measurement compartment cover removed. the instrument is in the data hold mode.
（1）Set the function selector switch to the“ACA” ◦Keep your fingers and hands behind the barrier To exit the data hold mode, press the data hold
position. during measurement. switch again.
（2）Press the trigger to open the transformer jaws 2×R03 or 1.5V AAA
（1）Set the function selector switch to the“ ”
and clamp onto one conductor only.
position
（3）Take the reading on the display.
（2）Plug the red test lead into the V/Ω terminal
5-2 DC Current Measurement and the black test lead into the COM terminal.
（1）Set the function selector switch to the （3）Check that the display reads "OL." with
“DCA”position the test lead prods shorted together,
（2）With the transformer jaws closed and without also check that the buzzer beeps and the
clamping them onto the conductor, press the display reads "0."
0 ADJ. Switch for more than 2 seconds to NOTE
（4）Connect the test lead prods to the circuit ◦If the instrument in the data hold mode enters
zero adjust the display. (less than 2 seconds under test and take the reading on the No.5-20 Nakane 2-chome, Meguro-ku, Tokyo, 152-
: Data Hold Function operates.)The 0 ADJ. the sleep mode, the data hold mode will be
display. The buzzer beeps the reading is cancelled. 0031 Japan
Switch is enabled only on DC 40A range. below 50 ± 35 Ω . ◦At DC 40A range, if the data hold switch is Phone:81-3-5731-2520
（3）Press the trigger to open the transformer pressed for more than 2 seconds, 0 ADJ.
jaws and clamp onto one conductor only. Fax:81-3-5731-2530
Function operates.
（4）Take the reading on the display.
92-1608B