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
read the instructions wherever the symbol appears
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.
●
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.
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. 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.
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).
3. Specification
3-1. Measuring range & accuracy
(accuracy guaranteed at 23
℃±
5
℃
.humidity 45
〜
85%)
AC Current 600A, 1000A Function
Function
Measuring
Range
Accuracy
KEW2040
KEW2055
600A
0-600.0A
±
1.5%rdg
±
5dgt
(50/60Hz)
±
3.5%rdg
±
8dgt
(40-400Hz)
±
1.5%rdg
±
5dgt
(50/60Hz)
±
3.5%rdg
±
8dgt
(40-400Hz)
1000A
0-1000A
N/A
DC Current 600A, 1000A Function
Function
Measuring
Range
Accuracy
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. 10M
Ω）
Range
Measuring
Range
Accuracy
KEW2040
KEW2055
6/60/600V 1-600.0V
±
1.3%rdg
±
4dgt (50/60Hz)
±
3.0%rdg
±
5dgt (40
〜
400Hz)
DC Voltage Function
（
Auto-ranging, Input impedance: approx. 10M
Ω）
Range
Measuring
Range
Accuracy
KEW2040
KEW2055
600mV/6/
60/600V
0-600.0V
±
1.0%rdg
±
3dgt
Resistance
（
Continuity/Diode Check
）
Function
Range
Measuring
Range
Accuracy
KEW2040
KEW2055
600
Ω
/6k/
60k/600k
Ω
6M
Ω
0-6M
Ω
±
1.0%rdg
±
5dgt
60M
Ω
6.00M-
60.00M
Ω
±
5%rdg
±
8dgt
Cont Buzzer 0-600.0
Ω
Threshold value : 60
Ω±
30
Ω
Diode
Test voltage: 0-2V
Frequency/ DUTY Function
（
Auto-ranging for
Frequency
）
Range
Measuring
Range
Accuracy
KEW2040
KEW2055
ACA
40Hz
−
400Hz
±
0.5%rdg
±
5dgt
ACV
1Hz
〜
10kHz
0.1-99.9%
(Pulse width/Pulse period)
±
2.5%rdg
±
5dgt
Note: Measurable inputs are: 40Vrms@ACV or
60Arms@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
/ /
), REL
Δ
,
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 : 10M
Ω
or more/ 1000V
（
between electrical circuit and enclosure
）
●
Conductor size
KEW2040: approx. 33mm
KEW2055: approx. 40mm
●
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)
HOLD SELECT ZERO
Hz/
DUTY
MAX/
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.
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 60A 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
Transformer
