INSTRUCTION MANUAL
DIGITAL CLAMP METER
KEW SNAP SERIES
KEW2040 600A AC Only Type
KEW2055 1000A AC/DC Type
1.Features
●Designed to meet international safety standards.
IEC61010-1.IEC61010-031:2002 & IEC61010-2-032
Measurement Category (CAT.) IV 600V
Pollution Degree 2
●Double molded main body provides comfortable
single handed grip ●Data Hold Function
●LCD Backlight function to facilitate working at
dimly lit situations. (KEW2055 only)
●REL function to indicate measurement variation.
(Current, voltage, Resistance measurement)
●MIN/MAX function enables easy reading of min &
max value during measurement.
●With Continuity & Diode Check Function
●NCV(Non Contact Voltage)Function for wiring
check.
●600V input protection.
●Sleep function to extend battery life.
●With Bar Graph, 6039 counts
2. 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 passed the inspection. 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 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.
●U n d e r s t a n d a n d f o l l o w a l l t h e s a f e t y
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.
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
symbol appears
read the instructions wherever the
in the 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 injury or instrument damage.
3. Specification
3-1. Measuring range & accuracy
(accuracy guaranteed at 23℃±5℃ .humidity 45∼85%)
AC Current 600A, 1000A Function
Accuracy
Measuring
Function
Range
KEW2040
KEW2055
±1.5%rdg±5dgt
(50/60Hz) ±1.5%rdg±5dgt
600A 0-600.0A
(50/60Hz)
±3.5%rdg±8dgt
±3.5%rdg±8dgt
(40-400Hz)
(40-400Hz)
1000A 0-1000A
N/A
DC Current 600A, 1000A Function
Accuracy
Measuring
Function
Range
KEW2040
KEW2055
600A 0-600.0A
N/A
±1.5%rdg±5dgt
1000A 0-1000A
N/A
AC Voltage Function
(Auto-ranging, Input impedance: approx. 10MΩ)
Accuracy
Measuring
Range
Range
KEW2040
KEW2055
±1.3%rdg±4dgt (50/60Hz)
6/60/600V 1-600.0V
±3.0%rdg±5dgt (40∼400Hz)
DC Voltage Function
(Auto-ranging, Input impedance: approx. 10MΩ)
Accuracy
Measuring
Range
Range
KEW2040
KEW2055
600mV/6/ 0-600.0V
±1.0%rdg±3dgt
60/600V
Resistance(Continuity/Diode Check)Function
Accuracy
Measuring
Range
Range
KEW2040
KEW2055
600Ω/6k/
±1.0%rdg±5dgt
60k/600kΩ 0-600.0kΩ
6MΩ
6.00M60MΩ
±5%rdg±8dgt
60.00MΩ
Cont Buzzer 0-600.0Ω Buzzer sounds at 100Ω or less
Diode
Test voltage: 0-2V
Frequency/ DUTY Function ( Auto-ranging for
Frequency)
Accuracy
Measuring
Range
Range
KEW2040 KEW2055
ACA
40Hz−400Hz
±0.5%rdg±5dgt
ACV
1Hz ∼ 10kHz
0.1-99.9%
±2.5%rdg±5dgt
(Pulse width/Pulse period)
Note: Measurable inputs are: 40Vrms@ACV or
50Arms@AC600A, 350A@AC1000A Range
3-2. General Specification
●Mode of operation :Δ∑ mode
●Display
: max. 6039 counts
(Frequency: 9999) & Bar graph
●Over-range indication : "OL" displayed when exceeding
the measuring range. (except for AC/DCV and 1000A
Function)
●Range switching
:
Auto-ranging / Voltage, Resistance Range
Single range / Continuity, Diode check and DUTY
●Sample rate
: three times per second
●Functional construction :
OFF/ACA/ACV/DCV/Ω KEW2040
OFF/ACA/DCA/ACV/DCV/Ω KEW2055
●Keys
:
SELECT(AC/DC switching & /Ω/ / ), RELΔ,
Hz/DUTY, MIN/MAX, HOLD/ Back Light (KEW2055)
●Power source
: DC3V/ R03(UM-4) x 2pcs
●Low battery warning : "
" mark is displayed at
2.4V±0.15V or less.
●Temperature & humidity : 23℃±5℃ , relative humidity
accuracy guaranteed 85% or less (no condensation)
●Operating temperature :0 ∼ 40℃ , relative humidity
& humidity range
85% or less (no condensation)
●Storage temperature
: -20∼60℃, relative humidity
& humidity range
85% or less (no condensation)
●Current consumption
: approx. 12 mA
●Sleep Function : Automatically powered off in about
15 min after the last Function switch operation.
Press any key or rotate the Function Switch from
OFF to any position to exit from the Sleep state.
●Applicable Standards
IEC 61010-1:2001
Measurement CAT. IV 600V Pollution degree 2
IEC 61010-031:2002, IEC 61010-2-032
EMC:EN 61326
・EN 55022
・EN 61000-4-2 (performance criterion B)
・EN 61000-4-3 (performance criterion B)
●Overload Protection
Current Range
: 720A AC/ 10 sec @KEW2040
1200A AC/DC/ 10 sec @KEW2055
Voltage Range
: 720V AC/DC/ 10sec
Resistance Range : 600V AC/DC/ 10sec
●Withstand Voltage
6880V AC(TRMS 50/60Hz)/ 5 sec
(between Jaws and electrical circuit/ between internal
circuit and enclosure)
●Insulation Resistance : 10MΩ or more/ 1000V
(between electrical circuit and enclosure)
●Conductor size
KEW2040: approx. 33mm
KEW2055: approx. 40mm
●Marks listed in the table below are used on this
instrument.
User must refer to the manual.
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 marked next to this symbol.
AC
DC
AC & DC
DANGER
●Never make measurement on a circuit in which
voltage over AC600V exists.
●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.
●Transformer jaw tips are designed not to short
the circuit under test. If equipment under test
has exposed conductive parts, however, extra
precaution should be taken to minimize the
possibility of shorting.
●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 cover during a
measurement.
●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 measurement if any
abnormal conditions, such as broken case
and exposed metal parts are found on the
instrument. ●Do not rotate the Function Switch while the
test leads are being connected.
●Do not install substitute parts or make any
modification to the instrument. For repair or
re-calibration, return the instrument to your
local distributor from where it was purchased.
●Do not try to replace the batteries if the
surface of the instrument is wet.
●Disconnect all the cords and cables from the
object under test and power off the instrument
before opening the Battery Cover for Battery
replacement.
●Verify proper operation on a known source
before use or taking action as a result of the
indication of the instrument.
●Use appropriate personal protective equipment
such as insulating gloves, Insulating boots, and
safety glasses.
●Dimension
approx. 254(L)×82(W)×36(D)mm / KEW2055
approx. 243(L)×77(W)×36(D)mm / KEW2040
●Weight : approx.: 300g @ KEW2040
: 310g @ KEW2055
●Accessories Test Leads
Model 7066 / 1 set
Battery
R03(UM-4)/ 2pcs
Instruction manual English, Japanese / 1pce
Carriyng Case
Model 9094/ 1pcs
3-3. Function Keys
The "●" mark shows available function at each Range.
DC Current Measurement (KEW2055 only)
Hz/
MAX/
HOLD SELECT ZERO DUTY
MIN
ACA
●
●
●
●
●
ACV
●
●
●
●
DCA
●
●
●
●
DCV
●
●
●
Ω
●
●
●
●
●
●
4. Preparation for measurement
4-1. Checking Battery Voltage
Set the Function Switch to any position other than
"OFF. " When the display is clear without "BATT" mark,
showing, battery voltage is enough. When the display
is blank or "BATT" mark is indicated, replace the
batteries according to Section 7, Battery Replacement.
CAUTION
The Sleep feature automatically powers the
instrument off in about 15 min after the last
switch or key operation. Therefore, the display
may be blank even with the Function Switch set
to a position other than "OFF. " To operate the
instrument in this case, turn the switch back to
the "OFF" position, then to any other position,
or press any key. Replace the batteries if nothing
was displayed after above operations.
4-2. Checking Switch Setting & Operation
Confirm the Function Switch is set to the correct
position, the instrument is set to the correct
measurement mode,
and the Data hold function is disabled. Otherwise,
desired measurement cannot be made.
CAUTION
●Set the Function Switch to an appropriate
position before starting measurement. ●Firmly insert the test leads. ●Disconnect the test leads from the instrument
for current measurement. ●Do not expose the instrument to the direct sun,
high temperature and humidity or dewfall. ●Altitude 2000m or less. Appropriate operating
temperature is within 0℃ and 40℃ .
●This instrument isn’
t dust & water proofed. Keep
away from dust and water.
●Be sure to power off the instrument 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.
Measurement categories (Over-voltage categories)
To ensure safe operation of measuring instruments,
IEC61010 establishes safety standards for various
electrical environments, categorized as CAT.I to
CAT.IV, and called measurement categories. Highernumbered 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.
CAT.Ⅰ: Secondary electrical circuits connected to an
AC electrical outlet through a transformer or
similar device.
CAT.Ⅱ: Primary 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).
5. Measurement
5-1. AC Current Measurement
DANGER
●Never make measurement on a circuit in which
voltage over AC600V exists to avoid getting
electrical shock.
●Transformer jaw tips are designed not to short
the circuit under test. If equipment under test
has exposed conductive parts, however, extra
precaution should be taken to minimize the
possibility of shorting.
●Do not make measurement with the Battery
Cover removed.
●Disconnect the test leads from the instrument for
current measurement.
(1) Set the Function Switch to "600A " or "1000A "
position. (on KEW2040, only "600A" is available)
AC has been selected by default; press the SELECT
key, when DC has been selected, to change it to
AC. AC mark is displayed at the upper left on the
display. (KEW2055 only)
(2) Press the trigger to open the transformer jaws
and clamp them onto the one conductor under test,
then take the reading on the display. Pressing the
"Hz/DUTY" Key switches the indication in following
sequence.
AC Current ⇨ Hz ⇨ DUTY
Hz/DUTY Function requires 50A or more at AC600A
Range and 350A or more at AC1000A range.
CAUTION
●Max conductor size for KEW2040 is approx dia.
33mm and for KEW2055 is approx dia. 40mm.
During current measurement, keep the trans
former jaws fully closed. Other wise, accurate
measurements cannot be taken.
5-2. DC Current Measurement (KEW2055 only)
DANGER
●Never make measurement on a circuit in which
voltage over DC600V exists to avoid getting
electrical shock.
●Do not make measurement with the Battery
Cover removed.
(1) Set the Function Switch to "600A " or "1000A "
position. AC has been selected by default; press
the SELECT key, when AC has been selected, to
change it to DC.
DC mark is displayed at the upper left on the
display.
5-4. DC Voltage Measurement
(2) With the transformer jaws closed and without
clamping them onto the conductor, press the
"ZERO" key to zero adjust the display. (mark is
displayed at the upper right on the display.)
(3) Press the trigger to open the transformer jaws and
clamp them onto the one conductor under test, the
conductor should be at the center of the jaws, then
take the reading on the display.
(4) Set the Function Switch to an appropriate position
according to current under test.
(5) Pressing the "ZERO" key again releases "ZERO"
function. (mark at the upper right on the display
disappears.)
CAUTION
●When the current flows from the upside (the
display side) to the underside of the instrument,
the polarity of the reading is positive and vice
versa.
5-3. AC Voltage Measurement
DANGER
●Never make measurement on a circuit in which
voltage over AC600V exists to avoid getting
electrical shock.
●Do not make measurement with the Battery
Cover removed.
●Keep your fingers behind the barrier on the
instrument during measurement.
(1) Set the Function Switch to "ACV" position.
(2) Connect the red test lead to V/Ω terminal and the
black test lead to COM terminal.
(3) Connect the test leads to the circuit under test.
Take the reading on the display. Pressing the
" Hz/DUTY " key while reading is indicated on
the display switches the indication in following
sequence. AC Voltage ⇨ Hz ⇨ DUTY
CAUTION
●Hz/DUTY Function requires AC40V or higher.
●To measure a frequency, measure the voltage
on the electrical circuit in advance.
●Then press the Hz/DUTY key to enter into
frequency measurement.
●Readings of frequency may fluctuate or be
influenced under noisy environment.
DANGER
●Never make measurement on a circuit in which
voltage over DC600V exists to avoid getting
electrical shock.
●Do not make measurement with the Battery
Cover removed.
●Keep your fingers behind the barrier on the
instrument during measurement.
of test leads. Indication should become zero and
buzzer sounds.
(3) Connect the test leads to the both ends of the
conductor under test. The buzzer sounds, if the
resistance under test is 100Ω or less.
Diode
(1) Set the Function Switch to "Ω/ Cont/ Diode "
position. "Ω" has been selected by default; press
the SELECT key to change it to "Diode"
(1) Set the Function Switch to "DCV" position.
Resistance ⇨ Cont ⇨ Diode
(2) Connect the red test lead to V/Ω terminal and the
black test lead to COM terminal.
(3) Connect the red and black test leads to the
positive (+)and negative (-) sides of the circuit
under test respectively. Take the reading on the
display. If the connection is reversed, the display
indicates the "-" mark.
5-5. Resistance/ Cont/ Diode Measurement
DANGER
●Never use the instrument on an energized circuit.
●Do not make measurement with the Battery
(2) Connect the red test lead to V/Ω terminal and the
black test lead to COM terminal.
Cathode
Anode
(3) Connect the red and black test leads to the Anode
and Cathode of the diode under test respectively.
Take the reading on the display. If the connection
is reversed, the display indicates "OL. "
Cover removed.
CAUTION
Resistance
(1) Set the Function Switch to "Ω/ Cont/ Diode "
position.
(2) Connect the red test lead to V/Ω terminal and the
black test lead to COM terminal. Confirm "OL" is
indicated on the display, and then short-circuit the
tips of test leads to make the indication zero.
(3) Connect the test leads to the both ends of the
resistor under test.
(4) Take the reading on the display.
CAUTION
●Even if short the test lead tips, indicated value
may not be zero. But this is because of the
resistance of test leads and not a failure.
●When test leads are open, "OL" is indicated on
the display.
Continuity
(1) Set the Function Switch to "Ω/ Cont/ Diode "
position. "Ω" has been selected by default; press
the SELECT key to change it to "Continuity. "
Resistance ⇨ Cont ⇨ Diode
6-2. HOLD Key
(1) Data Hold Function
This is a function to freeze the measured value
on the display. Press the "HOLD" key to freeze the
reading.
The reading will be held regardless of subsequent
variation in input. "H" is indicated on the upper left
corner of the display while the instrument is in the
Data Hold mode. To exit Data Hold mode, press the
"HOLD" key again.
●Some of diodes cannot be tested. Indication on
the display will be "OL"
. (Zener diode, LED and
so on)
6. Other functions
6-1. Sleep Function
(1) 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 enter
Sleep mode about 15 minutes after the last
key operation. To exit the Sleep mode, turn the
Function switch to "OFF", then to any other position,
or press any Key.
(2) Sleep Function is disabled when; MIN/MAX
Function is selected. Continuous measurement is
made with the Sleep Function being disabled. To
activate Sleep Function again, disable the MIN/
MAX Function.
CAUTION
●Held readings are released when Sleep
Function is activated while the instrument is in
the Data Hold mode.
(2) Backlight ON/OFF (KEW2055 only)
Pressing the HOLD key 2 sec or more lights up the
Backlight. Pressing the HOLD key 2 sec or more
again turns off the Backlight.
6-3. NCV Function
Red LED on the upper area on the Panel lights up
at all functions except for OFF when electric field
exceeding 100V is detected by the sensor installed in
the Jaws.
It indicates a presence of
voltage in an electrical circuit
or equipment without touching
them.
NCV Sensor can detect
electrical field only from the
direction indicated in the right
figure.
Put the fixed element (left
side) closer to the conductor
under test.
Detection against in-wall
outlet is impossible.
CAUTION
●The instrument consumes small amount of
battery power in the Sleep mode. Set the
Function Switch to the OFF position after use.
(2) Connect the red test lead to V/Ω terminal and the
black test lead to COM terminal. Confirm "OL" is
indicated on the display and short-circuit the tips
DANGER
●The LED may not light up due to installation
condition of electrical circuit or equipment.
Never touch the circuit under test to avoid
possible danger even if the LED for NCV
doesn’
t light up.
●Check the functionality of LED on a well-known
power supply prior to measurement. When the
LED doesn’
t light up, do not make measurement.
●NCV indication is affected by external voltage,
how to hold or place the instrument.
6-4. MIN/MAX Function
CAUTION
●SELECT, ZERO, Hz/DUTY keys are disabled
whileMIN/MAX Function is being activated.
(1) AC/DC Current Range (AC600A only on KEW2040)
Pressing the MIN/MAX Key at 600A & 1000A
Function enables min or max value measurement.
Press the MIN/MAX Key to select MAX or MIN. The
max or min value within measuring range is being
held until this function is disabled. "MIN" or "MAX"
is indicated on the display while this function is
being activated. To disable this function, press
down the MIN/MAX Key at least 2 sec or change
functions.
(2) AC/DC Voltage Range
CAUTION
●Pressing the MIN/MAX Key without applying
Zero Adjustment Function at Current Range "Δ" mark
is to be indicated at the upper right on the display while
ZERO function is being operated. Indication of relative
value at Current, Voltage, Resistance: Pressing the
ZERO Key indicates REL (relative value) Press the
ZERO Key to save the initial value at the start of
measurement as a reference value. Then the difference
between the later measured values and the reference
value is indicated on the display.
The Auto-ranging function is disabled, while this
function is being activated, and the Range is fixed to
the Range selected at the start of measurement.
Relative value is indicated within following ranges.
(Measuring range)
=(Full-scale value at the fixed Range) ‒ (Initial value)
To disable this function, press down the MIN/MAX Key
at least 2 sec or change functions.
6-6. Over-flow indication
When the input exceeds the measuring range at each
Function other than Voltage and 1000A Range, "OL" or
"-OL" is indicated on the display.
7. Battery Replacement
WARNING
●MIN/MAX, PEAK keys are disabled while ZERO
8. Maintenance
●Cleaning
Use a cloth dipped in water or neutral detergent for
cleaning the instrument.
Do not use abrasives or solvents. Otherwise, instrument
get damaged, deformed or discolored.
Function is being activated.
CAUTION
●Do not mix old and new batteries.
●Install batteries in correct polarity as indicated
in the Battery Compartment.
voltage disables the Auto-ranging function and
fixes the Range to 6V. Connect the test leads
to the circuit under test and press the MIN/MAX
Key after an appropriate range is selected by
Auto-ranging function.
Pressing the MIN/MAX Key enables min or max value
measurement. Press the MIN/MAX Key to select MAX
or MIN. The max or min value within measuring range
is being held until this function is disabled. "MIN" or
"MAX" is indicated on the display while this function is
being activated.
To disable this function, press down the MIN/MAX Key
at least 2 sec or change functions.
6-5. ZERO Function
CAUTION
●MIN/MAX, PEAK keys are disabled while ZERO
Function is being activated.
Replace the batteries when a Low Battery
Voltage warning "BATT" mark is indicated on the
display. Note that when the battery is completely
exhausted, the display blanks without "BATT" mark
shown.
(1) Set the Function Switch to "OFF" position.
(2) Unscrew and remove the Battery Compartment
Cover on the bottom of the instrument.
(3) Replace the batteries observing correct polarity.
Use new R03 (AAA) or LR03 / 1.5V batteries.
(4) Install the Battery Compartment and tighten the
screws.
06-02
92-1801A