YOKOGAWA CL360 User manual

User’s
Manual
CL360
Leakage Clamp-on Tester
リーククランプテスタ
IM CL360
2003.06 2 版(MC)
IM CL360
Contents
Precautions for Safety Use of the Instrument --------------------------- i
1. Instrument Layout ------------------------------------------------------------ 1
2. Measurement ------------------------------------------------------------------ 3
2.1 Preparation for Measurement ------------------------------------------------ 3
2.2 AC Current Measurement----------------------------------------------------- 3
2.3 How to Use The Frequency Selector Switch ----------------------------- 4
2.4 How to Use Peak Hold Function--------------------------------------------- 5
2.5 How to Use Peak Hold Frequency Selector Switch -------------------- 7
2.6 How to Use Data Hold Function ------------------------------------------- 10
2.7 How to Use OUTPUT Terminal -------------------------------------------- 10
3. Battery Replacement ------------------------------------------------------ 11
4. Specifications ---------------------------------------------------------------- 12
5. Calibration and After-sales Service ------------------------------------ 15
IM CL360 i
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 appropri-
ate. 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
r
death and/or damage to the instrument.
Double Insulation
This symbol indicates double insulation.
AC Voltage/Current
This symbol indicates AC voltage or current.
Ground
This symbol indicates ground (earth)
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 precau-
tions 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.
NOTE
Draws attention to information essential for understanding the op-
eration and features.
ii IM CL360
WARNING
●Never make measurement on a circuit above 600V AC.
●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 gas-
ses, 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 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 CL360 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.
Maximum Allowable Input
Function OVERVOLTAGE
CATEGORY II
OVERVOLTAGE
CATEGORY III
A AC 1000A rms
Measuring circuit voltage :
AC600Vrms
AC 1000A rms
Measuring circuit voltage :
AC300Vrms
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.

IM CL360 iii
CAUTION
●Be sure to set the Range 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.
●Do not expose the instrument to the direct sun, extreme temperatures or
dew fall.
●Never apply voltage to the OUTPUT terminal. The terminal is not electri-
cally isolated from the internal circuits of the instrument.
●Use a damp cloth and detergent for cleaning the instrument. Do not use
abrasives or solvents.
NOTE
●Radiation immunity affects the accuracy of CL360 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 CL360 1
1. Instrument Layout
OFF
(7)
(5)
(6)
(8)
(4)
(1)
(2)
(9)
(3)
(1) LCD Display : Field effect type of liquid crystal display with maximum
counts of 1999. Range symbol (mA, A) and decimal point automatically
appear as the Range switch is turned. "B" is displayed on the lower left
corner for low battery warning and "1" is displayed only at the higher digit
for overrange indication (except for 1000A range).
(2) Data Hold Button : Allows for easy reading in dimly lit or hard-to-reach
locations. The display can be observed away from the conductor after
pushing in the button.
2 IM CL360
(3) Two-way Analogue OUTPUT Terminal : AC current picked up by trans-
former jaws (7) is converted and output as AC and DC voltage output.
(See Analogue Output in chapter 4. Specifications) Insert output cord
Model 91020 into this terminal for monitoring waveform with an oscillo-
scope, making RMS measurements or connecting to a recorder.
(4) Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
(5) Range Switch : Selects range. It is also used to turn power on or off.
(6) Open/Close Lever : Operates the transformer jaws. Press to open the
transformer Jaws.
(7) Transformer Jaws : Pick up current flowing through the conductor.
(8) Peak Hold Selector Switch : Selects 10ms or 100ms response time. Set
the switch back to the OFF position to release peak hold or make normal
measurements.
(9) Frequency Selector Switch : Makes frequency response selection. Selects
"WIDE" or "50/60Hz".
IM CL360 3
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 is set to the desired setting before measure-
ment.
2.2 AC Current Measurement
WARNING
Do not make measurement on a circuit above 600V AC. This may cause
shock hazard or damage to the instrument or equipment under test.
(1) Set the range switch to the desired position. Do not exceed the maximum
allowable input current for the selected range.
(2) For normal measurement, press the open/close lever to open the trans-
former jaws and clamp onto one conductor only. Earth leakage current or
small current that flow through a grounded wire can also be measured by
this method. It is recommended that the conductor is placed at the center
of the closed transformer jaws.
Correct Wrong
4 IM CL360
(3) To measure out of balance leakage current, clamp onto all conductors
except a grounded wire. The leakage current measured will be indicated
on the display.
3-phase system
In case of 1-phase 3-wire system,
clam four wires for measurement.
LoadLoad
In case of 3-phase 4-wire system,
clamp three wires for measurement.
CAUTION
When measuring large current, observe the time limit specified in chapter 4,
Specifications. Otherwise, the transformers jaws may overheat, resulting in
damage to the instrument.
NOTE
●During current measurement, keep the transformer jaws fully closed. Oth-
erwise, accurate measurement cannot be made. The maximum measur-
able conductor size is approx. 68mm in diameter.
●Frequency selector switch is designed to select the "50/60Hz " and "WIDE"
frequency ranges. For further details, refer to section 2.3 for operation of
frequency selector switch.
●The transformer jaws may buzz when measuring large current. This has
no effect on the instrument’s performance or safety.
2.3 How to Use The Frequency Selector Switch
Model CL360 has a very good frequency response because of the electro-
magnetic property of its transformer jaws. Therefore, it measures AC current
not only of fundamental frequency of 50Hz or 60Hz, but of high frequencies
and harmonics superimposed on the fundamental frequency. To eliminate
these superimposed components and measure only in the fundamental fre-
quency, Model CL360 has a high-cut filter circuit, which can be activated by
setting the frequency selector switch to the 50/60Hz position.
The high-cut filter has a cut-off frequency of approx. 100Hz and an attenua-
tion characteristics of approx. -24dB/octave.
NOTE
-24dB/octave means that the magnitude of a signal declines by a factor of 16
when its initial frequency doubles.

IM CL360 5
The frequency selector switch has the following two positions.
●WIDE (40Hz to over 1kHz) :
Covers a wide frequency band from mains supply to high frequencies
generated by such equipment as inverters.
●50/60Hz (40 to Approx. 100Hz) :
Filters out high frequency components to restrict measurement in mains
frequency band.
NOTE
Selection with the frequency selector switch does not apply to AC output of
the two-way analogue output.
2.4 How to Use Peak Hold Function
10ms or 100ms response time can be selected for peak hold measurement.
Make selection according to your application needs.
(1) With the transformer jaws clamped onto the conductor under test, slide
the peak hold switch from the OFF position to the desired peak response
time position.
(2) The peak hold display reads 1/ 2of the peak current value. Therefore,
an RMS reading will be obtained when the current under test has a sinu-
soidal waveform.
Input Current
Peak Hold Current Output
(display value & DC output)
IP
IP
(3) Slide the peak hold switch back to the OFF position for a reset.
6 IM CL360
NOTE
●Model CL360 uses an analogue peak hold circuit to ensure a quick re-
sponse to input current. Because of the nature of this circuit, the peak hold
reading may gradually fall, or in a rare case, rise with time. This is likely to
be apparent when the instrument is used in a high temperature and high
humidity environment. Therefore, the instrument will not be suitable for
making peak measurement over an extended period of time. In case of
such a need, connect a recorder to the instrument via the analogue output
terminal.
●If it is necessary to read the display away from the conductor in a peak
hold measurement, press the data hold switch first and then remove the
instrument from the conductor. Otherwise, the peak hold reading may be
higher than the actual value due to the electrical noise caused by the
opening and closing of the transformer jaws. Press the data hold switch
again for a reset.
(4) Difference between 10ms and 100ms Peak Response Time. The peak
hold circuit in this instrument charges the peak-hold capacitor after recti-
fying the input waveform. The time for the voltage of the capacitor to
reach its peak value varies according to its capacitance and the output
impedance of the charging circuit. Model CL360 sets the time for the
voltage of the capacitor to reach 90% of its peak value to 10ms or 100ms
by switching between two output impedances.
10ms Peak Response Time 100ms Peak Response Time
Input
Waveform
Hold Capacitor Voltage
100％
90％100％
90％
10ms t100ms t
For instance, select the 10ms response time when measuring a surge current
that will occur when a power supply device is switched on. The 100ms re-
sponse time is recommended for measuring the starting current of a motor or
similar equipment. A stable measurement can be made on the 100ms second
response time setting as the peak hold circuit does not readily respond to the
surge current.
IM CL360 7
2.5 How to Use Peak Hold Frequency Selector Switch
Indicated value may vary according on input signal (waveform) when the
frequency selector switch is set to 50/60Hz. In this case, make measurement
referring to the block diagram below.
Circuit flowchart is shown below.
CT (50/60Hz)
(OFF)
I - V （WIDE）
SW
High cut
Filter
(100ms or
10ms）
(1) (2) (3)
Rectifying
circuit
Peak hold
Selection switch
Peak hold
circuit
Voltage
divider
Display
circuit
Frequency
selection
（)
1
2
Conversion
The signal (current) picked up by transformer jaws is converted from current
signal to voltage signal in I-V conversion circuit, and it enters the frequency
selector switch. If the frequency selector switch is set to WIED, it enters the
rectifying circuit. If set to 50/60Hz, enters the rectifying circuit after passing
through high-cut filter (cut-off frequency of approx. 100Hz and attenuation
characteristics of approx. -24dB/octave). If the peak hold selector switch is
set to OFF, the rectified signal enters the indication circuit. If set to 100ms or
10ms, passes through the peak hold circuit, picks up the peak value of input
signal, and outputs 1/ 2of the peak value into the indication circuit.
Different examples of peak hold statuses when the frequency selector switch
is set to WIDE or 50/60Hz are described below.
NOTE
If the frequency selector switch is switched after the peak hold switch is set to
100ms or 10ms, the over indication appears. Make sure that first set the
frequency selector switch, then, set the peak hold switch to 100ms or 10ms.
8 IM CL360
Example 1 When measuring the peak of starting current of motor:
Input waveform
(I-V circuit output)
Rectifying
circuit input
Peak hold circuit
(Hold value)
Frequency
Selector Wave at
WIDE position
Frequency
Selector Wave at
50/60Hz position
Surge pulse at switching on
(switching noise)
Waveform after passing through high-cut filter
(1) (2) (3)
Example 2 When measuring the peak current of thyristor:
Waveform after passing through high-cut filter
(1) (2) (3)
Input waveform
(I-V circuit output)
Rectifying
circuit input
Peak hold circuit
(Hold value)
Frequency
Selector Wave at
WIDE position
Frequency
Selector Wave at
50/60Hz position

IM CL360 9
Example 3 When measuring the peak current of inverter (where harmonic are
superimposed on the fundamental frequency):
Waveform after passing through high-cut filter
(1) (2) (3)
Input waveform
(I-V circuit output)
Rectifying
circuit input
Peak hold circuit
(Hold value)
Frequency
Selector Wave at
WIDE position
Frequency
Selector Wave at
50/60Hz position
NOTE
The indicated value at 50/60Hz may be higher than that at WIDE because of
the phase difference between superimposed harmonics and fundamental
frequency.
10 IM CL360
2.6 How to Use Data Hold Function
Push in the Data Hold button to freeze the reading. This is especially useful
for taking a reading a dimly lit or hard-to-reach locations. The display can be
observed away from the conductor. Push the button again to release the
reading.
2.7 How to Use OUTPUT terminal
AC and DC outputs can be obtained by inserting optional Model 91020 output
cord into the two-way analogue output terminal.
AC Output :
Can be monitored by connecting a digital multimeter to analogue output
terminal or observed as waveform by connecting an oscilloscope.
DC Output :
Can be monitored by connecting a digital multimeter, or a recorder, which
enables many hours of monitoring. With the CL360 in the peak hold mode,
DC voltage corresponding to 1/ 2of a peak current value can be held
and outputted.
Model 91020 (optional) Black(COM)
Red(DC)
Blue(AC)
CAP
Note : Put a cap on the plug when not in use.
Connect to multimeter or recorder
DC outputAC output
AC output DC output
RecorderOscilloscope
(connect to oscilloscope or multimeter)
Model CL360
Multimeter
OFF
IM CL360 11
3. Battery Replacement
WARNING
To avoid electric shock hazard, make sure to set the Range switch to "OFF"
and remove the test leads from the instrument before trying to replace bat-
tery.
CAUTIOIN
Make sure to install battery in correct polarity as indicated in battery com-
partment.
Replace the battery when "B" symbol appears on the LCD display.
(1) Set the Range 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 6F22 or 6LR61
battery.
(4) Re-place and screw the battery compartment cover.
Remove
this screw
6F22 Battery
12 IM CL360
4. Specifications
Instrument Specifications
●Measuring Ranges and Accuracy (at 23 ±10°C, 85% relative humidity or
less)
AC Current A
Accuracy
Frequency
Ranges Measuring
range WIDE 50/60Hz
Time limit
for Meas-
urements
200mA 0 to 199.9mA
2A 0 to 1.999A
20A 0 to 19.99A
±1.0% rdg ±2dgt
(50/60Hz)
±3.0% rdg ±2dgt
(40 to 1kHz)
±1.5% rdg ±2dgt
200A 0 to 199.9A
±1.5% rdg ±2dgt
(50/60Hz)
±3.5% rdg± 2dgt
(40 to 1kHz)
±2.0% rdg ±2dgt
0 to 500A
±1.5% rdg ±2dgt
(50/60Hz)
±3.5% rdg ±2dgt
(40 to 1kHz)
±2.0% rdg ±2dgt
Continuous
1000A
501 to 1000A ±5% rdg (50/60Hz)
±10% rdg (40 to 1kHz) ±5.5% rdg 10min.
Typical frequency characteristics
for 2A and higher ranges with the
frequency selector switch at WIDE
position.
Typical characteristics for 200mA
range with the frequency selector
switch at WIDE position.
All ranges
With the frequency selector switch
set at 50/60Hz position to cut off
higher frequencies -24dB/oct
Errors as aginst reading at 50Hz (%)
1000A range
Attenuation (dB)
Frequency (Hz)

IM CL360 13
Analogue Output (Output impedance: Approx. 1kΩ)
AC Output
Range Measuring range AC Output Voltage Accuracy
200mA 0 to 200mA
2A 0 to 2A
20A 0 to 20A
±2.0% rdg
200A 0 to 200A
0 to 200mV
±2.5% rdg
0 to 500A 0 to 50mV ±3.0% rdg
1000A 501 to 1000A 50 to 100mV ±5.0% rdg
Voltage proportional to the current under test is output with “WIDE” frequency
characteristics regardless of the setting of the frequency selector or peak hold switch.
DC Output
Accuracy (Frequency Range)
Range Measuring range DC Output
Voltage
Freq. Selector
Switch at WIDE
position
Freq. Selector
Switch at 50/60Hz
position
200mA 0 to 200mA
2A 0 to 2A
20A 0 to 20A
±3.0% rdg ±3.5% rdg
200A 0 to 200A
0 to 200mV
±3.5% rdg ±4.0% rdg
0 to 500A 0 to 50mV ±5.0% rdg ±5.5% rdg
1000A 501 to 1000A 50 to 100mV ±7.0% rdg ±7.5% rdg
General Specifications
●Operating System : Dual integration
●Measurement Function : AC current
●Display : Field effect 3 - 1/2 digit liquid crystal display with maximum count
of 1999
●Range selection : Manual
●Overrange Indication : "1" is displayed on the highest digit except for
1000A AC range.
●Response Time : Approx. 1 seconds.
●Sample Rate : Approx. 3 times per second.
●Temperature and Humidity for Guaranteed Accuracy : 23°C ±10°C, relative
humidity up to 85% without condensation
●Operating Temperature and Humidity : 0 to 40°C, relative humidity up to
85% without condensation
14 IM CL360
●Storage Temperature and Humidity : -10 to 50°C, relative humidity up to
80% without condensation
●Effect of conductor position: Within 2% difference between maximum and
minimum values to a 10 mm-dia conductor, at every part inside the jaws
●Effect of External Magnetic Field :
15mA AC max. in proximity to a 10mm-dia conductor carrying 100A AC.
●Effect of Residual Current : 10mA AC max. when clamping on two
10mm-dia conductors, each carrying supply or return 100A AC current.
●Power Source : 6LR61 or 6F22 DC9V battery
●Battery Life : Approx. 60 hours (continuity)
●Current Consumption : Approx. 5mA max.
●Withstanding Voltage : 3700V AC, 50/60Hz for 1 minute between electrical
circuit and housing case or metal part of the jaws
●Insulation Resistance : 10MΩor greater at 1000V between electrical circuit
and housing case or metal part of the jaws
●Conductor Size : Approx. 68mm diameter max.
●Dimensions : Approx.130(W) x 250(H) x 50(D) mm
●Weight : Approx. 570g
●Safety Standard: EN 61010-1
EN 61010-2-032
AC 300V CAT III, AC 600V CAT II,
Pollution degree 2, indoor use
●EMC Standard: EN 61326
EN 55022
●Accessories : 6F22 battery······························ 1
Carrying case Model 93031 ······ 1
User’s Manual ··························· 1
●Optional Accessories : Output cable with banana plug Model 91020
●Peak Hold : Response time selectable from approx. 10ms and 100ms.
1/ 2of the peak current is displayed, which means an RMS reading will
be obtained when current having sinusoidal waveform in measured.
Peak hold reading varies by approximately ±1% max of full scale in the
first minute at 23°C ±10°C and relative humidity of 75% without condensa-
tion.
IM CL360 15
5. 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, con-
tact the vendor from whom you purchased the instrument or the nearest
Yokogawa M&C sales office.
Condition Possible Cause Remedy
Display blanks after
power-on
Battery is improperly installed.
Battery is exhausted.
Install the battery correctly.
Replace the buttery.
Display reading
remains frozen.
Data hold button is pressed in.
Peak hold switch is at ON
position.
Release data hold button.
Set peak hold switch to OFF
position.
Transformer jaws buzz
when measuring large
current.
-----------------
This is not a failure
The lowest digit of
reading is unstable
-----------------
This is not a failure. The
instrument is highly accu-
rate, so it senses slight
variations in the current
under test.
Output cable
(Model 91020) does not
output voltage.
The cable is open circuit. Check the cable for an open
circuit.
Calibration
It is recommended that the instrument be calibrated once every year.

YOKOGAWA M&C CORPORATION
International Sales Dept.
2-9-32 Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Phone: [phone] Facsimile: 81-422-55-8654
YOKOGAWA CORPORATION OF AMERICA (U.S.A.)
Phone: [phone] Facsimile: 1-770-251-2088
YOKOGAWA EUROPE B. V. (THE NETHERLANDS)
Phone: [phone] Facsimile: 31-334-64-1610
YOKOGAWA AMERICA DO SUL S. A. (BRAZIL)
Phone: [phone] Facsimile: 55-11-5681-1274
YOKOGAWA ENGINEERING INSTRUMENTS KOREA CORPORATION (KOREA)
Phone: [phone] to -0664 Facsimile: 82-2-551-0665
YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)
Phone: [phone] Facsimile: 61-2-9888-1844
YOKOGAWA BLUE STAR LTD. (INDIA)
Phone: [phone] Facsimile: 91-80-227-4270
LTD. YOKOGAWA ELECTRIC (RUSSIAN FEDERATION)
Phone: [phone] 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：[phone] ファクシミリ：0422-55-8953
関西支店
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電話：[phone] ファクシミリ：06-6368-7045
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電話：[phone] ファクシミリ：052-581-7664
広島営業所
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電話：[phone] ファクシミリ：082-541-4567
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電話：[phone] 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：[phone] ファクシミリ：0422-51-8455
KIM1JE-2003.2