Transformer Jaws
Data Hold and 0 ADJ. Switch
Function Selecter Switch
Display
V/Ω Terminal
COM Terminal
Trigger
INSTRUCTION MANUAL
AC/DC DIGITAL CLAMP METER
KT203
1. Features
¡
Safety design conforming to the following provi-
sions of IEC61010.
Overvoltage category III 300V AC, pollution degree 2
Overvoltage category II 600V AC/DC, pollution degree 2
¡
Protected throughout by double or reinforced
insulation, indicated the International Electrical
Symbol "
F
"on the bottom of the instrument.
¡
Data hold switch for easy reading in dimly light
or hard-to-read locations.
¡
Sleep feature to extend battery life.
¡
Beeper permits easy continuity check.
¡
Provides a dynamic range of 4,000 counts full
scale.
¡
Uses shrouded transformer jaws to further
improve safety.
2. 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 retain 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.
¡
Save and keep the manual handy to enable
quick reference whenever necessary.
¡
Be sure to use the instrument only in its
intended applications and to follow mea-
surement procedures described in the
manual.
¡
Be sure to understand and follow all safety
instructions contained in the manual. 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.
DANGER
¡
Never make measurement on a circuit with a
voltage higher than 600 V AC/DC.
¡
Do not attempt to make measurement in the
presence of flammable gasses, fumes, vapor
or dust. Otherwise, the use of the instrument
may cause sparking, which can lead to an
explosion.
¡
Transformer jaws are made of metal and their
tips are not insulated. Where equipment
under test has exposed conductive parts, be
especially careful to avoid the hazard of
possible shorting.
¡
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.
¡
Never open the battery compartment cover
when making measurement.
WARNING
¡
Never attempt to make any measurement if
any abnormal conditions are noted, such as
broken case, cracked test leads and exposed
metal part.
¡
Do not turn the function selector switch with
plugged in test leads connected to the circuit
under test.
¡
Do not install substitute parts or make any
modification to the instrument. Return the
instrument to your distributor for repair or
recalibration.
¡
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
¡
Make sure that the function selector switch is
set to the appropriate position before making
measurement.
¡
Always make sure to insert each plug of the
test leads fully into the appropriate terminal
on the instrument.
¡
Make sure to remove the test leads from the
instrument before making current measurem-
ent.
¡
Do not expose the instrument to the direct
sun, extreme temperatures or dew fall.
¡
Be sure to set the function selector switch to
the
position after use. When the
instrument will not be in use for a long period
of time, place it in storage after removing the
battery.
¡
Use a damp cloth and detergent for cleaning
the instrument. Do not use abrasives or
solvents.
3. Specifications
Measuring Ranges and Accuracy
（
at 23
±
5
℃
, 45-75% relative humidity
）
AC Current
（
A
）
Auto-ranging (50/60Hz)
DC Current
（
A
）
Auto-ranging
AC Voltage
（
V
）
Auto-ranging (50/60Hz)
DC Voltage
（
V
）
Auto-ranging
Resistance
（Ω
/Continuity
）
Auto-ranging
（
Buzzer beeps below 50
±
35
Ω）
¡
Operating System :
Dual Integration
¡
Display :
Liquid crystal display
（
maximum count: 4199
）
¡
Low Battery Warning :
is shown on the display
¡
Overrange Indication :
OL. is shown on the display
¡
Response Time :
Approx. 2 seconds
¡
Sample Rate :
About 2.5 times per second
¡
Temperature and Humidity for Guranteed Accuracy:
23
±
5
℃
, relative humidity up to 85%
without condensation
¡
Operating Temperature and Humidity :
0
〜
40
℃
, relative humidity up to 85%
without condensation
¡
Storage Temperature and Humidity :
-20
〜
60
℃
, relative humidity up to 85%
without condensation
¡
Power Source :
Two R03 or equivalent
（
DC1.5V
）
batteries
¡
Current Consumption :
Approx. 15mA max. (ACA, DCA Range)
Approx. 5mA max. (ACV, DCV,
Ω
Range)
¡
Sleep Function :
Automatically powered down in about 10
minutes after the last switch operation
（
power consumption in the sleep mode is
about 35
μ
A.
）
¡
Standards :
IEC61010-1
CAT.III 300V AC, pollution degree 2
CAT.II 600V AC/DC, pollution degree 2
IEC61010-2-031
IEC61010-2-032
¡
Overload Protection :
AC current ranges : 480A AC/DC for 10sec
AC voltage ranges : 720V AC/DC for 10sec
Resistance ranges : 300V AC/DC for 10sec
¡
Operating Environmental Conditions :
Indoor use, Altitude up to 2000m
¡
Withstand Voltage :
3700VAC
（
RMS,50/60Hz
）
for 1 minute
between electrical circuit and housing case
¡
Insulation Resistance
10M
Ω
or greater at 1000V between elect-
rical circuit and housing case
¡
Conductor Size :
Approx. 30 mm diameter max
¡
Dimensions :
187
（
L
）
x 68.5
（
W
）
x 38.5
（
D
）
mm
¡
Weight :
Approx. 200g
（
including batteries
）
¡
Accessories :
Test leads
Two R03 batteries
Instruction manual
5-2 DC Current Measurement
（
1
）
Set the function selector switch to the
DCA
position
（
2
）
With the transformer jaws closed and
without clamping them onto the conductor,
press the 0 ADJ. Switch for more than 2
seconds to zero adjust the display. (less
than 2 seconds : Data Hold Function
operates.)The 0 ADJ. Switch is enabled
only on DC 40A range.
（
3
）
Press the trigger to open the transformer
jaws and clamp onto one conductor only.
（
4
）
Take the reading on the display.
NOTE
When current flows from the upside to the
underside of the instrument, the polarity of the
reading is positive (+). Othewise, the polarity of
the reading is negative (-).
6. Voltage Measurement
DANGER
¡
Never use the instrument on a circuit with a
voltage higher than 600 VAC/DC. Otherwise,
electric shock hazard or damage to the
instrument or the circuit under test may result.
¡
Do not make measurement with the battery
compartment cover removed.
6-1 AC Voltage Measurement
（
1
）
Set the function selector switch to the
ACV
position
（
2
）
Plug the red test lead into the V/
Ω
terminal
and the black test lead into the COM
terminal.
（
3
）
Connect the test lead prods to the circuit
under test and take the reading on the
display.
6-2 DC Voltage Measurement
（
1
）
Set the function selector switch to the
DCV
position
（
2
）
Plug the red test lead into the V/
Ω
terminal
and the black test lead into the COM
terminal.
（
3
）
Connect the test lead prods to the circuit
under test and take the reading on the
display.
7.Resistance Measurement
DANGER
¡
Always make sure that the circuit under test
is powered off.
¡
Do not make measurement with the battery
compartment cover removed.
（
1
）
Set the function selector switch to the
position
（
2
）
Plug the red test lead into the V/
Ω
terminal
and the black test lead into the COM terminal.
4. Preparation for Measurement
4-1 Checking Battery Voltage
Set the function selector switch to any position
other than
. When the display is clear
without
showing, proceed to measu-
rement. When the display blanks or
is
indicated, replaces the batteries according to the
instructions described in section 9. Battery
Replacement.
NOTE
The sleep feature automatically turns the instru-
ment off in a certain period of time after the last
switch operation. Therefore, the display may be
blank with the function selector switch set to a
position other than
. To operate the
instrument in this case, set the switch back to
the
position, then to the desired
position, or press any switch. If the display still
blanks, the batteries are exhausted. Replace
the batteries.
4-2 Checking Switch Setting and Operation
Make sure that the function selector switch is set
to the correct position and the data hold switch is
deactivated. Otherwise, desired measurement
cannot be made.
5. Current Measurement
WARNING
¡
Do not make measurement on a circuit with a
voltage higher than 600 V AC/DC. Otherwise,
shock hazard or damage to the instrument or
equipment under test may result.
¡
Transformer jaw tips are designed to
minimize the possibility of shorting conductors
in the circuit under test. If equipment under
test has exposed conductive parts, however,
extra precaution should be taken to avoid
possible shorting.
¡
Do not make measurement with the battery
compartment cover removed.
¡
Do not make current measurement with the
test leads connected to the instrument.
NOTE
¡
During current measurement, keep the trans-
former jaws fully closed. Otherwise, accurate
measurement cannot be made. The maxi-
mum conductor size is 30 mm in diameter.
¡
When measuring a larger current, the trans-
former jaws may buzz. This does not affect
the instrument's accuracy.
5-1 AC Current Measurement
（
1
）
Set the function selector switch to the
ACA
position.
（
2
）
Press the trigger to open the transformer
jaws and clamp onto one conductor only.
（
3
）
Take the reading on the display.
（
3
）
Check that the display reads "OL." with
the test lead prods shorted together, also
check that the buzzer beeps and the
display reads "0."
（
4
）
Connect the test lead prods to the circuit
under test and take the reading on the
display. The buzzer beeps the reading is
below 50
±
35
Ω
.
NOTE
¡
When shorting the test lead prods together,
the display may show a very small resistance
instead of "0." This is the resistance of the
test leads.
¡
If one of the test leads has an open, the
display reads "OL."
8. Other Functions
8-1 Sleep Function
NOTE
The instrument still consumes small amount of
battery power in the sleep mode. Make sure to
set the function selector switch to the "
OFF
"
position after use.
(1) Sleep Mode
This is a function to prevent the instrument from
being left powered on in order to conserve battery
life. This function causes the instrument to
automatically enter the sleep (powered down)
mode about 10 minutes after the last switch or
button operation.
To exit the sleep mode, turn the function selector
switch back to "
OFF
", then to any other position,
or press any button.
(2) How to disable the sleep mode
To disable the sleep mode, Power the instrument
on with the data hold switch pressed. "P.OFF" is
shown on the display for about 3 seconds after
the instrument is powered on.
To enable the sleep mode, power the instrument
off, then power it on without pressing the data
hold switch.
8-2 Data Hold Function
This is a function used to freeze the measured
value on the display. Press the data hold switch
to freeze the reading. The reading will be held
regardless of subsequent changes in input. "
"
is shown on the upper left corner of the display
while the instrument is in the data hold mode.
To exit the data hold mode, press the data hold
switch again.
NOTE
¡
If the instrument in the data hold mode enters
the sleep mode, the data hold mode will be
cancelled.
¡
At DC 40A range, if the data hold switch is
pressed for more than 2 seconds, 0 ADJ.
Function operates.
9.Battery Replacement
WARNING
To avoid electric shock hazard, make sure to
set the function selector switch to "OFF" and
remove the test leads from the instrument
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 compartment.
When
is shown on the display, replace
the batteries. Note that when the battery is
completely exhausted, the display blanks
without
shown.
(1) Set the function selector switch to the "
OFF
"
position.
(2) Unscrew and remove the battery compartment
on the bottom of the instrument.
(3) Replace the batteries observing correct
polarity. Use two new R03 or equivalent
batteries.
(4) Mount and screw the battery compartment
cover.
Range Measuring Range
Accuracy
40A
0-40.00A
400A
15.0-299.9A
300.0-400.0A
±
3.0%rdg
±
8dgt
±
3.5%rdg
±
6dgt
±
4.0%rdg
±
6dgt
Range Measuring Range
Accuracy
40A
0-40.00A
400A
15.0-299.9A
300.0-400.0A
±
3.0%rdg
±
8dgt
±
3.5%rdg
±
6dgt
±
4.0%rdg
±
6dgt
Range Measuring Range
Accuracy
400V
0-400.0V
600V
150-600V
±
1.5%rdg
±
5dgt
Range Measuring Range
Accuracy
400
Ω
0-400.0
Ω
4000
Ω
150-4000
Ω
±
2.0%rdg
±
5dgt
1.5V
1.5V
Battery Compartment
2×R03 or 1.5V AAA
Range Measuring Range
Accuracy
400V
0-400.0V
600V
150-600V
±
2.0%rdg
±
5dgt
92-1639
Ｂ
Ａ
Ｔ
