User’s
r
Manual
CL255
Clamp-on Tester
クランプテスタ
IM CL255
Contents
Precautions for Safety Use of the Instrument ---------------------------i
1. Instrument Layout ------------------------------------------------------------1
2. Measurement ------------------------------------------------------------------ 4
2.1 Preparation for Measurement ------------------------------------------------ 4
2.2 DC Current Measurement ----------------------------------------------------- 4
2.3 AC Current Measurement----------------------------------------------------- 5
2.4 DC Voltage Measurement----------------------------------------------------- 6
2.5 AC Voltage Measurement ----------------------------------------------------- 7
2.6 Resistance Measurement -----------------------------------------------------8
2.7 Continuity Check (400Ω range fixed)---------------------------------------8
2.8 Frequency Measurement------------------------------------------------------ 9
2.9 Peak Measurement ----------------------------------------------------------- 10
2.10 Average Measurement--------------------------------------------------------11
3. Other Functions ------------------------------------------------------------- 12
3.1 Sleep Function ----------------------------------------------------------------- 12
3.2 Data Hold Function ----------------------------------------------------------- 12
3.3 LoHz Function------------------------------------------------------------------ 12
3.4 OUTPUT Terminal (For current ranges only)--------------------------- 13
3.5 Optional Accessories--------------------------------------------------------- 14
4. Battery Replacement ------------------------------------------------------ 15
5. Specifications ---------------------------------------------------------------- 16
6. Calibration and After-sales Service ------------------------------------ 20
2003.06 2 版(MC)
Precautions for Safe Use of the Instrument
When handling the instrument, ALWAYS observe all of the cautionary notes
on safety given below. Yokogawa M&C Corporation is not at all liable for
damage resulting from misuse of this product by the user that is contrary to
these cautionary notes.
Various symbols are used on the instrument and in this manual to ensure the
product is used safety and to protect operators and property from possible
hazards or damage. The following safety symbols are used where appropriate. Read the explanations carefully and familiarize yourself with the symbols
before reading the text.
The instrument and this manual use the following safety symbols:
Danger! Handle with Care.
This symbol indicates that the operator must refer to an explanation
in the User’s Manual in order to avoid the risk of personal injury o
death and/or damage to the instrument.
Double Insulation
This symbol indicates double insulation.
AC Voltage/Current
This symbol indicates AC voltage or current.
DC Voltage/Current
This symbol indicates DC voltage or current.
AC/DC Voltage/Current
This symbol indicates AC/DC voltage or current.
Ground
Indicates that there is a possibility of serious personal injury or loss of life if
the operating procedure is not followed correctly and describes the precautions for avoiding such injury or loss of life.
Indicates that there is a possibility of serious personal injury of damage to the
instrument if the operating procedure is not followed correctly and describes
the precautions for avoiding such injury or damage.
NOTE
Draws attention to information essential for understanding the operation and features.
IM CL255 i
This symbol indicates ground (earth)
WARNING
CAUTION
IM CL255
WARNING
● Never make measurement on a circuit above 750V AC or 1000V DC.
● Do not use the instrument in an atmosphere where any flammable or ex-
plosive gas is present.
● 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.
● Avoid using the instrument if it has been exposed to rain or moisture or if
your hands are wet.
● Do not exceed the maximum allowabIe input of any measurement range.
● Never open the battery compartment cover when making measurement.
● Do not use the instrument if there is any damage to the casing or when the
casing is removed.
● 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 Yokogawa M&C or your distributor for repair or
re-calibration.
● Always switch off the instrument before opening the battery compartment
cover for battery replacement.
WARNING
To avoid damage to the instrument or electric shock!
The restrictions on the maximum voltage level for which the CL255 testers
can be used, depend on the over-voltage categories specified by the safety
standards. These category specifications are formulated to protect operators
against transient impulse voltage in power lines.
Function
A, A
V, V AC 750V rms/DC 1000V
Input terminal-to-ground
voltage
Measuring circuit voltage :
AC 750V rms
DC 1000V
AC 750V rms/DC 1000V
ii IM CL255
Maximum Allowable Input
OVERVOLTAGE
CATEGORY II
AC 2000A rms
OVERVOLTAGE
CATEGORY III
AC 2000A rms
Measuring circuit voltage :
AC 600V rms
DC 600V
AC 600V rms/DC 600V
Over-voltage category I (CAT.I):
Signal level, special equipment or parts of equipment, telecommunication,
electronic etc., with smaller transient over-voltages than CAT.II.
Over-voltage category II (CAT.II)
Local level, appliance, portable equipment etc., with smaller transient
over-voltages than CAT.III.
Over-voltage category III (CAT.III):
Distribution level, fixed installation, with smaller transient over-voltages
than CAT.IV.
CAUTION
● Always make sure to insert each plug of the test leads fully into the appro-
priate terminal on the instrument.
● Make sure to remove the test leads from the instrument before making
current measurement.
● Be sure to set the Function Selector switch to the "OFF" 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.
NOTE
● Radiation immunity affects the accuracy of CL255 testers under the condi-
tions specified in EN 61000-4-3:1997.
● If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.
IM CL255 iii
1. Instrument Layout
(1)
(2)
(3)
(4)
(7)
(6)
(5)
(12)
(9)
(8)
(10)
(11)
(13)
(1) Transformer Jaws : Pick up current flowing through the conductor.
(2) Open/Close Lever : Operates the transformer jaws. Press to open the
Transformer Jaws.
(3) Function Selector Switch : Selects function to use. Also switches off the
instrument when set to "OFF" position.
(4) Data Hold Button : Freezes the display reading. "
display when Data Hold is enabled.
Note : When the plug is inserted into the output terminal, Data Hold Switch
operates as range selection switch. (See section 3.4 OUTPUT Terminal)
(5)
Mode Selector Button : Selects measuring mode. The instrument
defaults to the normal mode (NOR) Then, press this switch to cycle
through measuring modes. In any mode, pressing this switch for more than
one second returns the instrument to the normal mode.
IM CL255 1
(14)
" is shown on the
A / V
(ACA/ACV)
Normal
↓
Average
↓
Peak
↓
Frequency
Display
Hz
A/ V
(DCA/DCV)
Normal
↓
Average
↓
Peak
Display
(Resistance/Continuity)
Resistance
↓
↓
↓
Continuity
check
Display
Ω
(6)
Button : Used for zero adjustment on DCA and resistance ranges.
Also used to reset the display reading in the PEAK mode. On DCA range,
" is shown on the display when auto-zeroing is completed.
"
(Auto-zeroing is available on 400A range only.)
(7) LCD Display : Field effect type of liquid crystal display with maximum
counts of 3999. Function symbols and decimal point are controlled by the
microprocessor based on the selected function and measuring mode.
AC DC Average mode
Data Hold
Negative sign
Continuity
Check
Low battery warning
Peak mode DCA auto zero
Resistance
Voltage
Ampere
Low frequency
input
(8) Terminal Cover : Slides over Hi and Lo Terminals to prevent access to
them when OUTPUT terminal is in use.
(9) OUTPUT Terminal (For AC or DC current range only) : Provides DC volt-
age output in proportion to the AC or DC current reading. The output is
connected to a recording device such as a chart recorder for long hour
monitoring. No output is available on voltage and resistance ranges.
(10) Lo Terminal : Accepts the black test lead for voltage or resistance meas-
urement.
(11) Hi Terminal : Accepts the red test lead for voltage or resistance meas-
urement.
(12) Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
2 IM CL255
(13) Test Leads (Model 98011) : Connected to Lo and Hi terminals for voltage
or resistance measurement.
(14) Output Plug (Model 98012) : Plugs into the OUTPUT terminal for con-
nection to a recording device. (See section 3.4, OUTPUT Terminal.)
2. Measurement
2.1 Preparation for Measurement
CAUTION
● The jaw section is a delicate, precision sensor. Do not subject the jaw to
unreasonably strong shock, vibration, or force when using it.
● If dust gets into the tops of the jaws, remove it immediately. Do not close
the jaws when dust is trapped in its joints as the sensor may break.
● Please check that the Function Selector switch is set to the desired posi-
tion before measurement.
2.2 DC Current Measurement
WARNING
● Do not make measurement on a circuit above 1000VDC. This may cause
shock hazard or damage to the instrument or equipment under test.
● Do not make current measurement with the test leads connected to the Hi
and Lo terminals.
Correct Wrong
(1) Set the Function Selector switch to the "
A " position. "DC" should be
shown on the upper left corner of the display.
(2) With the transformer jaws closed and without clamping them onto the
conductor, press the
button for about one second to zero adjust
the display. (Zero adjust feature is for 400A range only.) When zero adjustment is completed, "
" appears on the display.
(3) Press the open/close lever to open the transformer jaws and clamp them
onto the conductor under test, then take the reading on the display. The
most accurate reading will be obtained by keeping the conductor at the
center of the transformer jaws.
IM CL255 3
4 IM CL255
NOTE
● During current measurement, keep the transformer jaws fully closed. Otherwise, accurate measurement cannot be made. The maximum measurable conductor size is approx. 55mm in diameter.
● 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.
● The
the OUTPUT terminal. In this case, make zero adjustment on the recording
device.
● Turing the Function Selector switch to a position other than DCA cancels
the zero adjustment.
button may not completely zero adjust the output voltage from
2.3 AC Current Measurement
WARNING
● Never use the instrument on a circuit above 750VAC. This may cause
electrical shock hazard and damage to the instrument or the circuit under
test.
● Do not make measurement with the battery compartment cover removed.
Correct Wrong
(1) Set the Function Selector switch to the " A" position. "AC" should be
shown on the upper left corner of the display.
(2) Press the open/close lever to open the transformer jaws and clamp them
onto a single conductor and take the reading on the display. The most
accurate reading will be obtained by keeping the conductor at the center
of the transformer jaws.
NOTE
● During current measurement, keep the transformer jaws fully closed. Otherwise, accurate measurements cannot be taken. Maximum conductor
size is 55mm in diameter.
● Zero adjustment is not necessary in AC current measurement. There is no
polarity in the reading either.
● When the current under test measures 3% of the full scale or less, or the
frequency of the current is low, "LoHz" is indicated on the display.
2.4 DC Voltage Measurement
WARNING
Never use the instrument on a circuit above 1000VDC. This may cause electrical shock hazard and damage to the instrument or the circuit under test.
Red test lead
Black test lead
(1) Set the Function Selector switch to the " V " position. "DC" should be
shown on the upper left corner of the display.
(2) Slide the terminal cover to the left to disclose the Hi and Lo terminals.
Plug the red test lead into the Hi terminal and the black test lead into Lo
terminal.
(3) Connect the tip of the red and black test leads to the positive (+) and
negative (-) sides of the circuit under test respectively. Take the reading
on the display.
IM CL255 5
2.5 AC Voltage Measurements
WARNING
Never use the instrument on a circuit above 750VAC. This may cause electrical shock hazard and damage to the instrument or the circuit under test.
Red test lead
Black test lead
(1) Set the Function Selector switch to the " V" position. "AC" should be
shown on the upper left corner of the display.
(2) Slide the terminal cover to the left to disclose the Hi and Lo terminals.
Plug the red test lead into Hi terminal and the black test lead into the Lo
terminal.
(3) Connect the tip of the red and black test leads to the circuit under test
and take the reading on the display.
NOTE
When the voltage under test measures 3% of the full scale or less, or the
frequency of the voltage is low, "LoHz" is indicated on the display.
6 IM CL255
2.6 Resistance Measurement
WARNING
Never use the instrument on an energized circuit.
(1) Set the Function Selector switch to the "
be shown on the upper right corner of the display.
(2) Slide the terminal cover to the left to disclose the Hi and Lo terminals.
Plug the red test lead into the Hi terminal and the black test lead into the
Lo terminal.
(3) With the tip of the test leads shorted together, press the
offset the resistance of the test leads.
(4) Connect the tip of the test leads to the circuit under test and take the
reading on the display.
" position. The "Ω" should
button to
2.7 Continuity Check (400Ω range fixed)
The continuity check mode is enabled by pressing the button on
resistance range. "
strument in the continuity check mode. The buzzer beeps, if the resistance
under test is 20Ω or less.
" and "Ω" is indicated on the display to show the in-
WARNING
Never use the instrument on an energized circuit.
(1) Set the Function Selector switch to the "
(2) Slide the terminal cover to the left to disclose the Hi and Lo terminals.
Plug the red test lead into the Hi terminal and the black test lead into the
Lo terminal.
(3) With the tip of the test leads shorted together, press the
offset the resistance of the test leads.
" position.
button to
IM CL255 7
8 IM CL255
(4) Press the button once to enter from the normal mode to the
continuity check mode. "
(5) Connect the tip of the test leads to the circuit under test. If the resistance
is 20Ω or less, the buzzer beeps.
" should be indicated on the display.
2.8 Frequency Measurement
● On ACA or ACV range, the frequency of the current or voltage under test
can be counted and shown on the display.
● In the frequency measurement mode, "
● Trigger threshold is approx. 10V for AC voltage and approx. 10A for AC
current. At frequency measurement, in case of low input signal, it often
happens that measurement cannot be made. Because range is fixed at
400V for AC voltage and at 400A for AC current.
" is indicated on the display.
WARNING
● Never use the instrument on a high voltage circuit above 750VAC. This
may cause electrical shock hazard and damage to the instrument or the
circuit under test.
● Do not make current measurement with the test leads plugged into the
instrument.
(1) Set the Function Selector switch to the "
(2) Press the
the frequency measurement mode. "
play.
(3) Follow instructions for ACA or ACV measurement and take the frequency
reading.
button three times to enter from the normal mode to
NOTE
When the voltage under test measures 3% of the full scale or less, or the
frequency of the current or voltage is 40Hz or less, "LoHz" is indicated on the
display.
IM CL255 9
A" or " V" position.
" should be indicated on the dis-
2.9 Peak Measurement
● In this mode, " " is indicated on the display.
● In the PEAK mode, the display shows current or voltage's crest in effec-
tive value. (For example, when the current or voltage is sinusoidal, the
reading equals the crest value divided by the square root of two.) The display reading is constantly updated with a maximum crest.
● Response time is 300ms in DC measurement and 10ms in AC measurement.
WARNING
● Never use the instrument on a circuit above 750VAC or 1000VDC. This
may cause electrical shock hazard and damage to the instrument or the
circuit under test.
● Do not make measurement with the test leads plugged into the instrument.
(1) The PEAK mode is available on DCA, ACA, DCV and DCA ranges.
Set the Function Selector switch to the "
position.
Note: Only on DCA range, press the button for about one second
(2) Press the
to zero adjust the reading with the transformer jaws closed.
PEAK mode. "
(3) Follow instructions for DCA, ACA, DCV or ACV measurement.
(4) For accurate reading, press the
clamping onto the conductor or making test lead connections to the circuit
under test. Then proceed to measurement.
button twice to enter from the normal mode to the
" should be shown on the display.
INPUT Current
Peak Hold
NOTE
● In the PEAK mode, the auto-ranging feature is disabled and measuring
ranges are fixed as follows.
DCA and ACA : 0 to 400.0A
DCA and ACV : 0 to 400.0V
● The Sleep function is disabled in the PEAK mode as well.
10 IM CL255
A", " A", " V" or " V"
button to reset the reading after
2.10 Average Measurement
This mode is available on ACV, DCV, ACA and DCA ranges.
(1) Set the Function Selector switch to the "
position.
(2) Press the
Average mode. "
(3) Follow instructions for ACV, DCV, ACA or DCA measurement.
(4) The display shows a running average of six readings over an interval of
about 2 seconds.
button once to enter from the normal mode to the
" should be indicated on the display.
A", " A", " V" or " V"
3. Other Functions
3.1 Sleep Function
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 the
Sleep (powered-down) mode about 30 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.
The current is consumed a little in the Sleep mode.
NOTE
● Connecting the plug to the OUTPUT terminal disables the Sleep function.
The function is enabled on removing the plug from the terminal.
● The Sleep function is disabled in the PEAK measurement mode.
3.2 Data Hold Function
This is a function used to freeze the measured value on the display. Press the
Data Hold button to freeze the reading. The reading will be held regardless of
subsequent variation in input. "
display while the instrument is in the Data Hold mode.
To exit the Data Hold mode, press the Data Hold button again.
NOTE
If the instrument in the Data Hold mode goes into "sleep", it will return to the
normal mode.
3.3 LoHz Function
In ACV or ACA range, if frequency of the voltage or current under test is 40Hz
or lower, the display indicates "LoHz" and sample rate is automatically
switched from the normal 3 times/sec to 2 times/sec to reduce fluctuation of
the reading.
"LoHz" is also indicated where input is 3% of full scale or less.
" is shown on the upper right corner of the
IM CL255 11
12 IM CL255
3.4 OUTPUT Terminal (For current ranges only)
WARNING
● Never use the instrument on a circuit above 750VAC or 1000VDC. This
may cause electrical shock hazard and damage to the instrument or the
circuit under test.
● Never apply voltage to the OUTPUT terminal.
When the plug is inserted into the output terminal, auto-range function is
cleared.
Set the range depending on the state of Data Hold Switch.
Data Hold Switch OFF 400A range
Data Hold Switch ON 2000A range
Note : After measurement, be sure to return Data Hold switch to "OFF" posi-
tion.
(1) Attach the output plug to a connection lead so that the output voltage can
be connected to a recording device such as a chart recorder.
(2) Slide the terminal cover to the right to disclose the OUTPUT terminal and
insert the output plug into the terminal. Make connection to the recording
device.
NOTE
● Consult the output voltage specifications shown in chapter 5 and adjust the
sensitivity of the recording device.
● On DC current range, the
the output voltage from the OUTPUT terminal. In this case, make zero adjustment on the recording device.
● Connecting the plug to the OUTPUT terminal disables the Sleep function.
The function is enabled on removing the plug from the terminal. The instrument enters Sleep mode 30 minutes after the plug is removed.
● For long hours of use of the OUTPUT terminal, use an Alkaline battery,
which will extend continuous recording time up to about 24 hours.
button may not completely zero adjust
3.5 Optional Accessories
Clamp Adapter Model 99025 (For AC current measurement only)
Clamp Adapter Model 99025 is designed to increase the measuring capability
of a clamp meter. With the use of the Clamp Adapter, you can not only extend
current range over 3000A, but also clamp on a large bus-bar or conductor.
(1) Set the Function Selector switch to the "
(2) As shown in the figure below, clamp Model CL255 onto the pickup coil of
Model 99025.
(3) Clamp Model 99025 onto the bus-bar or conductor under test.
(4) Take the reading on Model CL255 and multiply it by 10.
A " position.
(3) Set the Function Selector switch to the desired position (ACA or DCA)
and follow appropriate measurement instructions.
IM CL255 13
4. 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 battery.
CAUTIOIN
Make sure to install battery in correct polarity as indicated in battery compartment.
If the battery voltage becomes too low for the instrument to operate normally,
" is shown on the display. Then, replace the battery. 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 in-
strument.
(3) Replace the battery observing correct polarity. Use a new 6LR61 (Alka-
line) or 6F22 (Manganese) 9V battery.
(4) Re-place and screw the battery compartment cover.
Battery
compartment cover
Battery
Screw
"
NOTE
For the detailed specification, refer to the Clamp Adapter User’s Manual.
14 IM CL255
5. Specifications
Instrument Specifications
● Measuring Ranges and Accuracy (at 23±5°C, 45 to 75% relative humidity)
DC Current
Measuring Range (Auto-ranging) Accuracy
0 to ±399.9A
±150 to ±2000A
Auto-ranging
Lo : 0 to 399.9A (Shifts to Hi at 400.0A)
Hi : 150 to 2000A (Shifts to Lo at 149A. At 2020A or above, "OL" is shown.)
AC Current
Measuring Range (Auto-ranging) Accuracy
0 to ±399.9A
150 to 1700A
1701 to 2000A ±3.5% rdg ±3dgt (50/60Hz)
Conversion method : AC coupled, true rms responding, calibrated to the rms
Auto-ranging
Lo : 0 to 399.9A (Shifts to Hi at 400.0A)
Hi : 150 to 2000A (Shifts to Lo at 149A. At 2020A or above, "OL" is shown.)
DC Voltage V (Input impedance: 1MΩ)
Measuring Range (Auto-ranging) Accuracy
0 to ±39.99V
±15.0 to ±399.9V
±150 to ±1000V
Auto-ranging
Lo : 0 to 39.99V (Shifts to Mid at 40.00V)
Mid : 15.0 to 399.9V (Shifts to Lo at 14.9V and to Hi at 400.0V)
Hi : 150 to 1000V (Shifts to Mid at 149V. At 1020V or above, "OL" is shown.)
A
±1.5% rdg ±2dgt
A
(Crest factor (CF): 3.0 or less, peak current: 3000A or less)
±1.5% rdg ±3dgt (50/60Hz)
±3.0% rdg ±4dgt (30 to 1kHz)
±1.0% rdg ±2dgt
IM CL255 15
16 IM CL255
AC Voltage V (Input impedance: 1MΩ)
(Crest factor (CF): 3.0 or less, peak voltage: 1200V or less)
Measuring Range (Auto-ranging) Accuracy
0 to 39.99V
15.0 to 399.9V
150 to 750V
Conversion method : AC coupled, true rms responding, calibrated to the rms
Auto-ranging
Lo : 0 to 39.99V (Shifts to Mid at 40.00V)
Mid : 15.0 to 399.9V (Shifts to Lo at 14.9V and to Hi at 400.0V)
Hi : 150 to 750V (Shifts to Mid at 149V. At 770V or above, "OL" is shown.)
±1.5% rdg ±3dgt (50/60Hz)
±2.0% rdg ±4dgt (30~1kHz)
Resistance Ω
Measuring Range (Auto-ranging) Accuracy
0 to 399.9Ω
150 to 3999Ω
Auto-ranging
Lo : 0 to 399.9
Hi : 150 to 3999
(Shifts to Hi at 400.0Ω)
Ω
(Shifts to Lo at 149Ω. At 4000Ω or above, "OL" is shown.)
Ω
±1.5% rdg ±2dgt
Continuity Check (Range fixed)
Measuring Range Accuracy
10 to 399.9Ω ±1.5% rdg ±2dgt
The buzzer beeps when the resistance is 20Ω or less.
Frequency
Measuring Range Accuracy
10 to 3999Hz ±1.5% rdg ±5dgt
OUTPUT (Output impedance: about 10kΩ)
Measuring Range Output voltage (mVDC) Accuracy
0 to ±399.9A 0 to ±399.9mV
DC
±150 to ±2000A ±15.0 to ±200.0mV
0 to 399.9A 0 to 399.9mV
AC
150 to 1700A 15.0 to 170.0mV
1701 to 2000A 170.1 to 200.0mV ±3.5%rdg±3mV (50/60Hz)
±1.5% rdg ±3mV
±1.5%rdg±3mV (50/60Hz)
±3.0%rdg±3mV (40~1kHz)
Most alternating currents and voltages are expressed in effective values,
which are also referred to as RMS (Root-Mean-Square) values.
The effective value is the square root of the average of square of alternating
current or voltage values.
Many clamp meters using a conventional rectifying circuit have "RMS" scales
for AC measurement. The scales are, however, actually calibrated in terms of
the effective value of a sine wave though the clamp meter is responding to
the average value. The calibration is done with a conversion factor of 1.111
for sine wave, which is found by dividing the effective value by the average
value. These instruments are therefore in error if the input voltage or current
has some other shape than sine wave.
value
V rms
1
2
≒0.707
A
1
3
AD
Average
A
A
value
2
≒0.637
A
0.5A
ｆ
A
T
＝A・D
A
Conversion
factor
V rms/V avgV avg
≒1.111
1
2
3
≒1.155
AD
＝
AD
Reading errors f or
average sensing
22
A 1.111－A
0.5A 1.111－ 3
＝－3.8%
1
D
instruments
0％
×
A
≒11.1%
×
A
3
(1.11 D－1）
×100％
×100
A
×100
Crest factor
CF
2
≒1.414
1
3
≒1.732
A
＝
AD
1
D
Waveform
A
0
A
0
A
0
A
0
ｆ
*CF(Crest Factor) is found by dividing the peak value by the effective value.
Examples:
DC: CF=1
Sine wave: CF=1.414
Square wave with a 1:10 duty ratio: CF=3
Effective
T
D=f/T
General Specifications
● Operating System : Dual integration
● Measurement Function : AC current, DC current, AC voltage, DC voltage,
resistance, continuity check, frequency
● Display : Liquid crystal display with maximum counts of 3999
● Overrange Indication : "OL" is shown on the display
*Effective Value (rms)
IM CL255 17
● Response Time : Approx. 2 seconds.
● Sample Rate : Approx. 3 times per second.
● Temperature and Humidity for Guaranteed Accuracy : 23°C ±5°C, relative
humidity up to 75% without condensation
● Operating Temperature and Humidity : 0 to 40°C, relative humidity up to
85% without condensation
● Storage Temperature and Humidity : -20 to 60°C, relative humidity up to
85% without condensation
● Effect of conductor position : Within ±1.5%rdg ±3dgt of indicated value at
the center to a 10 mm-dia conductor carrying 100A, at every part inside
the jaws
● Effect of external magnetic field : 4A or less in AC or DC magnetic field of
400 A/m
● Power Source : 6LR61 or 6F22 9V battery
● Battery Life : Approx. 15 hours (continuity)
● Current Consumption : Approx. 15mA max.
● Sleep function : Automatically powered down in Approx. 30 minutes after
the last switch operation (power consumption : Approx. 200µA)
● Withstanding Voltage : 5500V AC, 50/60Hz for 1 minute between electrical
circuit and housing case or metal part of the jaws
● Insulation Resistance : 10MΩ or greater at 1000V between electrical circuit
and housing case or metal part of the jaws
● Conductor Size : Approx. 55mm diameter max.
● Dimensions : Approx. 105(W) x 250(H) x 49(D) mm
● Weight : Approx. 540g (with battery)
● Safety Standard: EN 61010-1
EN 61010-2-031
EN 61010-2-032
AC/DC 600V CAT III, AC/DC 1000V CAT II,
Pollution degree 2, indoor use
● EMC Standard: EN 61326
EN 55022
● Accessories : Test leads Model 98011············· 1set
6F22 battery······························ 1
Carrying case Model 93034 ······1
Output Plug Model 98012·········· 1
User’s Manual ··························· 1
● Optional Accessories : Clamp adapter Model 99025
Output cable for terminal screw Model 91019
18 IM CL255
6. Calibration and After-sales Service
Should any failure occur while you are using the tester, follow the instructions
given below. If the tester still fails to operate correctly and needs repair, contact the vendor from whom you purchased the instrument or the nearest
Yokogawa M&C sales office.
● Turn off the POWER switch once, then turn it back on again.
● If the tester does not turn on, replace the battery with a new one.
Calibration
It is recommended that the instrument be calibrated once every year.
IM CL255 19
20 IM CL255
YOKOGAWA M&C CORPORATION
International Sales Dept.
2-9-32 Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Phone: 81-422-52-5716 Facsimile: 81-422-55-8654
YOKOGAWA CORPORATION OF AMERICA (U.S.A.)
Phone: 1-770-253-7000 Facsimile: 1-770-251-2088
YOKOGAWA EUROPE B. V. (THE NETHERLANDS)
Phone: 31-334-64-1611 Facsimile: 31-334-64-1610
YOKOGAWA AMERICA DO SUL S. A. (BRAZIL)
Phone: 55-11-5681-2400 Facsimile: 55-11-5681-1274
YOKOGAWA ENGINEERING INSTRUMENTS KOREA CORPORATION (KOREA)
Phone: 82-2-551-0660 to -0664 Facsimile: 82-2-551-0665
YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)
Phone: 61-2-9805-0699 Facsimile: 61-2-9888-1844
YOKOGAWA BLUE STAR LTD. (INDIA)
Phone: 91-80-227-1513 Facsimile: 91-80-227-4270
LTD. YOKOGAWA ELECTRIC (RUSSIAN FEDERATION)
Phone: 7-095-737-7868 Facsimile: 7-095-737-7869
計測機器営業部
〒180-8750 東京都武蔵野市中町 2-9-32
電話：0422-52-5984 ファクシミリ：0422-55-8953
関西支店
〒564-0063 大阪府吹田市江坂町 1-23-101 大同生命江坂ビル 10 階
電話：06-6368-7041 ファクシミリ：06-6368-7045
中部支店
〒450-0003 名古屋市中村区名駅南 1-27-2 日本生命笹島ビル 12 階
電話：052-581-7490 ファクシミリ：052-581-7664
広島営業所
〒730-0037 広島市中区中町 8-12 広島グリーンビル８階
電話：082-240-7676 ファクシミリ：082-541-4567
九州営業所
〒812-0037 福岡市博多区御供所町 3-21 大博通りビジネスセンター7 階
電話：092-262-5740 ファクシミリ：092-262-5741
本社
〒180-5679 東京都武蔵野市中町 2-9-32
電話：0422-52-5679 ファクシミリ：0422-51-8455
KIM1JE-2003.2
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