User's
Manual
CL250
Clamp-on Tester
クランプテスタ
IM CL250
保証書付
IM CL250
2017.10 11 版 (KYOU)
Contents
■ Precautions for Safety Use of the Instrument ……………………………… i
1. Instrument Layout …………………………………………………………… 1
2. Measurement ………………………………………………………………… 3
2.1 Preparation for Measurement ……………………………………… 3
2.2 DC Current Measurement …………………………………………
3
2.3 AC Current Measurement …………………………………………
4
2.4 DC Voltage Measurement …………………………………………
5
2.5 AC Voltage Measurement …………………………………………
6
2.6 Resistance Measurement …………………………………………… 7
2.7 Continuity Check (400Ω range fixed) …………………………… 7
2.8 MAX Measurement …………………………………………………
8
3. Other Functions ……………………………………………………………
9
3.1 Sleep Function ………………………………………………………
9
3.2 Data Hold Function …………………………………………………
9
3.3 OUTPUT Terminal (For current ranges only) …………………… 10
3.4 Optional Accessories ……………………………………………… 11
4. Battery Replacement ……………………………………………………… 12
5. Specifications ……………………………………………………………… 13
6. Calibration and After-sales Service ……………………………………
16
■ 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 or 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
This symbol indicates ground (earth).
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.
WARNING
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.
CAUTION
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.
IM CL250
i
NOTE
Draws attention to information essential for understanding the operation and
features.
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
explosive 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 Meters & Instruments or your distributor
for repair or re-calibration.
● Always switch off the instrument before opening the battery compartment
cover for battery replacement.
● Do not use the test leads that have deteriorated or are detective.
● Check the test leads continuity
ii
IM CL250
WARNING
To avoid damage to the instrument or electric shock!
The restrictions on the maximum voltage level for which the CL250 testers
can be used, depend on the Measurement categories specified by the safety
standards. These category specifications are formulated to protect operators
against transient impulse voltages in power lines.
Maximum Allowable Input
MEASUREMENT
MEASUREMENT
CATEGORY Ⅲ
CATEGORY Ⅳ
AC 2000A rms
AC 2000A rms
Measuring circuit voltage : Measuring circuit voltage :
A, A
AC 600V rms
AC 750V rms
DC 600V
DC 1000V
V, V
AC 750V rms/DC 1000V
AC 600V rms/DC 600V
Input terminal-toAC 750V rms/DC 1000V
ground voltage
Function
O (None, Other)
Other circuits that are not directly connected to MEAINS.
Measurement category II (CAT.II)
Local level, appliance, portable equipment etc., with smaller transient
measurement than CAT.III.
Measurement category III (CAT.III):
Distribution level, fixed installation, with smaller transient measurement
than CAT.IV.
Measurement category Ⅳ (CAT. Ⅳ ):
Primary supply level, overhead lines, cable systems, and on.
CAUTION
● 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 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 CL250 testers under the
conditions specified in EN61000-4-.
●If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.
IM CL250
iii
1.Instrument Layout
(1)Transformer Jaws : Pick up current flowing through the conductor.
(2)Open/Close Lever : Used to open and close the transformer jaws.
(3)Function Selector Switch : Selects function to use. Also switches off the
instrument when set to the "OFF" position.
(4)Data Hold Button : Freezes the display reading with "
" symbol shown
on the display when pushed in.
Note : When the plug is inserted into the output terminal, Data Hold Switch
operates as range selection switch. (See section 3.3 OUTPUT Terminal)
(5)
Button : Used to switch the instrument between the AC and DC
modes. The instrument is set to the AC mode when it is powered on. Press
this button to select the DC mode.
(6)
Button : A press of this button on a current or voltage range turns the
instrument to the MAX measurement mode with "
" shown on the
display. Press the button again to exit the MAX mode.
A press of the button on the resistance range turns the instrument to the
continuity check mode with " " symbol shown on the display. In this mode,
IM CL250
1
the buzzer beeps when the reading is about 50Ω or less. Press the button
again to exit the continuity check mode.
(7)
Button : Used for zero adjustment on 400A DC range or for resetting the reading in the MAX mode. "
" symbol is shown on the display
when zero adjustment is enabled on 400A DC range. (Zero adjustment is
available only 400A DC range.)
(8)LCD Display : Field effect type of liquid crystal display with maximum
counts of 3999 and microprocessor-controlled annunciators and the decimal point.
(9)Terminal Cover : Used to enclose the input terminals (Lo and Hi) when the
OUTPUT terminal is in use, thus avoiding accidental application of voltage
to the instrument.
(10)OUTPUT terminal (for current measurement only) : Provides DC voltage in
proportion to the reading on an AC or DC current range. The voltage is
used for such purposes as long term monitoring with a recorder or other
recording devices. This terminal cannot be accessed on a voltage or
resistance range.
(11)Lo Terminal : Accepts the black test lead for voltage or resistance measurement.
(12)Hi Terminal : Accepts the red test lead for voltage or resistance measurement.
(13)Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
(14)Test Leads (Model 98072) : Connect to Lo and Hi terminals for voltage or
resistance measurement.
(15)Output Plug (Model 98012) : Insert this plug into the OUTPUT terminal to
obtain DC output voltage. Connect suitable connection cord to the plug
when it is used. (See section 3.3 OUTPUT Terminal)
(16)Barrier: It is a part providing protection against electrical shock and
ensuring the minimum required air and creepage distances.
2
IM CL250
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 range and mode are set to the desired position
before measurement.
2.2 DC Current Measurement
WARNING
●Do not make measurement on a circuit above 1000VDC. This may cause
shock hazard.
●Do not make current measurement with the test leads connected to the
instrument.
●Keep your fingers and hands behind the barrier during measurement.
400A " position and press the
(1)Set the Function Selector switch to the "
button to select the DC mode. "DC" should be shown on the upper
left corner of the display.
(2)With the transformer jaws closed without clamping them onto the conbutton for about one second to zero adjust the
ductor, press the
button is enabled only on 400A DC range.) "
" should
display. (
be shown on the display.
(3)Set the Function Selector switch to the position appropriate for the order of
the current under test.
IM CL250
3
(4)Press the open/close lever to open the transformer jaws and clamp them
onto the conductor under test 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 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 output voltage from the OUTPUT terminal may not reduce to nil even if
the display is zero adjusted with the
button. In this case, make zero
adjustment on the recorder or other device that the output voltage is
connected to.
●Turing the Function Selector switch to a position other than DCA cancels
the zero adjustment.
2.3 AC Current Measurement
WARNING
●Do not make measurement on a circuit above 750V AC. This may cause
shock hazard.
●Do not make current measurement with the test leads connected to the Hi
and Lo terminals.
●Keep your fingers and hands behind the barrier during measurement.
(1)Set the Function Selector switch to the " 400A" or " 2000A" position
and select the AC mode. If the instrument is in the DC mode, press the
button once to select the AC mode. (The instrument is set to the AC
mode when it is powered on.) "AC" should be shown on the upper left
corner of the display.
4
IM CL250
(2)Press the open/close lever to open the transformer jaws and clamp them
onto the conductor under test 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 measurement cannot be made. The Maximum
measurable conductor size is 55mm in diameter.
●Unlike in DC current measurement, zero adjustment is not necessary in AC
current measurement. There is no polarity in the reading either.
●The output voltage from the OUTPUT terminal may not reduce to nil even if
the display is zero adjusted with the
button. In this case, make zero
adjustment on the recorder or other device that the output voltage is
connected to.
2.4 DC Voltage Measurement
WARNING
Do not make measurement on a circuit above 1000VDC. This may cause
electric shock hazard.
400V" or "
1000V"
(1)Set the Function Selector switch to the "
position. If the instrument is in the AC mode, press the
button once to
select the DC mode. (The instrument is set to the AC mode when it is
powered on.) "DC" should be shown on the upper left corner of the display.
(2)Slide the terminal cover to the left. Plug the red test lead into the Hi
terminal and the black test lead into the Lo terminal.
IM CL250
5
(3)Connect the other end of the tip of the red test lead the positive side of the
circuit under test and the tip of the black test lead to the negative side.
Take the reading on the display. If the test lead connection is reversed, the
"-" sign is shown on the display.
2.5 AC Voltage Measurements
WARNING
Do not make measurement on a circuit above 750V AC. This may cause
electric shock hazard.
400V" or " 750V" position. If
(1)Set the Function Selector switch to the "
the instrument is in the DC mode, press the
button once to select
AC mode. (The instrument is set to the AC mode when it is powered on.)
The "AC" should be shown on the upper left corner of the display.
(2)Slide the terminal cover to the left. Plug the red test lead into the Hi
terminal and black test lead into the Lo terminal.
(3)Connect the tip of the test leads to the circuit under test. Take the reading
on the display.
6
IM CL250
2.6 Resistance Measurement
WARNING
Never try to make measurement on a circuit that is not de-energized.
(1)Set the Function Selector switch to the "
" position. The "Ω" should
be shown on the upper right corner of the display.
(2)Slide the terminal cover to the left. Plug the red test lead into the Hi
terminal and the black test lead into the Lo terminal.
(3)Check that the display reads "OL". Then, short the tip of the test leads
together and check that the display reads "0".
(4)Connect the tip of the test leads to the circuit under test and take the
reading on the display.
NOTE
●When the tip of the test leads is shorted together, the display may read a
very small resistance instead of "0". This is the resistance of the test leads,
not fault.
●If one of the test leads has a break, the display reads "OL".
2.7 Continuity Check (400Ω range fixed)
WARNING
Never try to make measurement on a circuit that is not de-energized.
(1)Set the Function Selector switch to the "
" position.
(2)Slide the terminal cover to the left. Plug the red test lead into the Hi
terminal and the black test lead into the Lo terminal.
(3)Press the
button to select the continuity check mode. The " "
symbol should be shown on the display.
(4)Check that the display reads "OL". Then short together the tip of the test
leads and make sure that the display reads "0" and the buzzer beeps.
IM CL250
7
(5)Connect the tip of the test leads to the circuit under test. The buzzer beeps
when the resistance is about 50Ω or less.
NOTE
●When the tip of the test leads is shorted together, the display may read a
very small resistance instead of "0". This is the resistance of the test leads,
not a fault.
●If one of the test leads has a break, the display reads "OL".
2.8 MAX Measurement (Response time : 400ms)
The MAX measurement mode is used to display a maximum reading over a
certain period of time. This function is available on all ranges other than Ω
ranges.
WARNING
●Do not make measurement on a circuit above 750VAC or 1000VDC. This
may cause electric shock hazard.
●Do not make measurement with the test leads connected to the instrument.
(1)Set the Function Selector switch to the desired position.
button to select the MAX measurement mode. "
"
(2)Press the
should be shown on the display.
button once after
(3)In order to take a correct reading, press the
clamping the jaws onto the conductor or connecting the test leads to the
circuit under test.
(4)The display shows the maximum reading during measurement.
(5)Press the
button once again to return to the normal measurement
mode.
NOTE
●Data Hold function is disabled in MAX measurement mode.
●For measurement over a period more than 10 minutes, disable the Sleep
function according to the User’s Manual in section 3.1 Sleep Function.
Otherwise, the instrument automatically turns itself off in about 10 minutes.
8
IM CL250
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 switch to
the Sleep (powered-down) mode about 10 minutes after the last switch or
button operation.
To exit the Sleep mode, press any button or turn the Function Selector switch
back to "OFF", then to any other position.
<How to disable the Sleep function>
Powering the instrument on with the Data Hold button pressed disables the
Sleep function. "P.OFF" is shown on the display for about 3 seconds to
indicate this.
To enable the Sleep function, turn the Function Selector switch back to
"OFF", then to any other position.
NOTE
The Sleep function is disabled while the output plug is inserted into the
OUTPUT terminal. When the output plug is disconnected from the terminal,
the Sleep function is enabled in about 10 minutes.
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
" is
subsequent variation of current, voltage or resistance under test. "
shown on the upper right corner of the display.
To exit the Data Hold mode, press the Data Hold button again.
NOTE
●The Data Hold mode is disabled when the instrument switches to the Sleep
mode.
●The Data Hold function is disabled in the MAX measurement mode.
IM CL250
9
3.3 OUTPUT Terminal (For current measurement only)
WARNING
●Do not make measurement on a circuit above 750VAC or 1000VDC. This
may cause electric shock hazard.
●Never apply voltage to the OUTPUT terminal.
(1)To obtain output voltage from the OUTPUT terminal, connect a suitable
cord to the supplied output plug.
(2)Slide the terminal cover to the right to enclose the Lo and Hi terminals.
Insert the output plug into the OUTPUT terminal for connection with a
recorder or other recording device.
400A" or "
2000A" posi(3)Set the Function Selector switch to the "
tion. (The output is available only in the two ranges.) Proceed to measurement in the DC or AC mode.
NOTE
●In the DC mode, the output voltage from the OUTPUT terminal may not
button. In
reduce to nil even if the display is zero adjusted with the
this case, make zero adjustment on the recorder or other device that the
output voltage is connected to.
●The Sleep function is disabled while the output plug is inserted into the
OUTPUT terminal. When the output plug is disconnected from the terminal,
the Sleep function is enabled in about 10 minutes.
●Set the appropriate sensitivity on the recorder or other recording device.
(See chapter 5. Specifications.)
10
IM CL250
3.4 Optional Accessories
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 "
400A" position.
(2)Select the AC mode with the
button.
(3)As shown in the figure below, clamp MODEL CL250 onto the pickup coil of
MODEL 99025.
(4)Clamp MODEL 99025 onto the bus-bar or conductor under test.
(5)Take the reading on MODEL CL250 and multiply it by 10.
NOTE
For the detailed specification, refer to the Clamp Adapter User’
s Manual.
IM CL250
11
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 batteries.
CAUTION
●Do not mix new and old batteries.
●Make sure to install batteries in correct polarity as indicated in battery
compartment.
If the instrument is powered on, but the display blanks or "
" is shown on
the lower left corner of the display, replace the batteries.
Note that when the battery is completely exhausted, the display blanks
" shown.
without "
(1)Set the Function Selector switch to the "OFF" position.
(2)Unscrew and remove the battery compartment cover on the bottom of the
instrument.
(3)Replace the batteries observing correct polarity. Make sure to use two new
R6P batteries.
(4)Replace and screw the battery compartment cover.
12
IM CL250
5. Specifications
■ Instrument Specifications
●Measuring Ranges and Accuracy (at 23±5℃, 45 to 85% relative humidity)
DC Current A
Range
Measuring Ranges
400A
0 to ± 399.9A
2000A
0 to ± 1999A
AC Current
Range
400A
DC Voltage
Range
Measuring Ranges
0 to 1000A
1001 to 1999A
± 3.0% rdg ± 2dgt (50/60Hz)
V (Input impedance: 2MΩ)
Measuring Ranges
0 to ± 399.9A
1000A
0 to ± 999A
Range
Accuracy
± 1.5% rdg ± 2dgt (50/60Hz)
± 3.0% rdg ± 4dgt (40 to 500Hz)
± 5.0% rdg ± 4dgt (500 to 1kHz)
400A
AC Voltage
± 1.5% rdg ± 2dgt
A
0 to 399.9A
2000A
Accuracy
Accuracy
± 1.0% rdg ± 2dgt
V (Input impedance: 2MΩ)
Measuring Ranges
400A
0 to 399.9A
750A
0 to 749A
Accuracy
± 1.5% rdg ± 2dgt (50/60Hz)
± 1.5% rdg ± 4dgt(40 to 1kHz)
Resistance Ω (Auto-ranging)
Range
400Ω
4000Ω
Measuring Ranges
0 to 3999Ω
Resistance, Continuity check
レンジ
400Ω
IM CL250
測定範囲
0 to 399.9Ω
Accuracy
± 1.5% rdg ± 2dgt
(Range Fixed)
確度(周波数範囲)
±1.5% rdg ±2dgt
(Buzzer beeps at 50 ± 35Ω or less)
13
OUTPUT (Output impedance: about 10kΩ)
Measuring Range
DC
AC
400A
0 to 400.0mV
Input voltage
0 to 400A
2000A 0 to 200.0mV
0 to 2000A
400A
0 to 400.0mV
0 to 400A
0 to 100.0mV
0 to 1000A
2000A
100.1 ∼ 200.0mV 1001 to 2000A
Accuracy
±1.5% rdg ±3mV
1.5% rdg ± 3mV
(50/60Hz)
± 3.0% rdg ± 3mV
(40 to 500Hz)
± 5.0% rdg ± 3mV
(500 to 1kHz)
± 3.0% rdg ± 3mV
(50/60Hz)
*Electromagnetic compatibility (IEC61000-4-3)
: RF field strength =< 1V/m, total accuracy = specified accuracy
: RF field strength = 3V/m, total accuracy = specified accuracy +2% of range
◆General Specifications
●Operating System : Dual integration
●Measurement Function : DC Current, AC Current, DC Voltage, AC Voltage,
Resistance, Continuity Check
●Display : Liquid crystal display with maximum counts of 3999
●Overrange Indication : "OL" is displayed on each range.
●Response Time : Approx. 2 seconds.
●Sample Rate : Approx. 2.5 times per second.
●Temperature and Humidity for Guaranteed Accuracy : 23℃ ±5℃, relative
humidity up to 85% without condensation
●Operating Temperature and Humidity : 0 to 40℃, relative humidity up to
85% without condensation
●Storage Temperature and Humidity : -20 to 60℃, 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 : Two R6P(DC1.5V) batteries or equivalent
●Battery Life : Approx. 100 hours (continuity)
●Current Consumption : About 9mA max.
14
IM CL250
●Sleep Function : Automatically switches to the Sleep mode in Approx. 10
minutes after the last switch or button operation (current consumption in the
Sleep mode: Approx. 20μA)
●Withstanding Voltage : 8200V AC for 5sec. (between electrical circuit and
housing cases or metal parts of jaws)
●Insulation Resistance : 10MΩ or greater at 1000V (between electrical
circuit and housing cases, or metal parts of the jaws
●Conductor Size : Approx. 55mm diameter max.
●Dimensions : Approx. 105(W) x 250(H) x 49(D) mm
●Weight : Approx. 530g (with batteries)
●Safety Standard :EN 61010-1, EN 61010-2-033
EN 61010-031, EN 61010-2-032
AC/DC 600V CAT Ⅳ, AC/DC 1000V CAT Ⅲ,
Pollution degree 2, indoor use altitude 2000m or less
●EMC Standard :EN 61326-1,EN 61326-2-1, EN 55011
●Radiation immunity : EN61000-4-3
●Environmental standard: EN 50581
●Accessories : Test leads Model 98072 ………… 1set
R6P (SUM3) batteries …………… 2
Carrying case Model 93034 …… 1
Output Plug Model 98012 ……… 1
User’s Manuall ……………………… 1
●Optional Accessories : Clamp adapter Model 99025
Output cable for terminal screw Model 98077
IM CL250
15
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 Meters & Instruments 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.
16
IM CL250
This manual is valid only in China.
产品中有害物质的名称及含量
有害物质
表示该有害物质在该部件所有均质材料中的含量均在GB/T 26572
规定的限量要求以下。
表示该有害物质至少在该部件的某一均质材料中的含量超出GB/T 26572
规定的限量要求。
IM CL250
17
Download PDF
Similar pages