YOKOGAWA CL360 User Manual

User’s

r

Manual

CL360
Leakage Clamp-on Tester
リーククランプテスタ

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

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.

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.

This symbol indicates ground (earth)

WARNING

CAUTION

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 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 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.

Function

A

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.

Measuring circuit voltage :
AC 600V rms

Maximum Allowable Input

OVERVOLTAGE

CATEGORY II

AC 1000A rms

OVERVOLTAGE

CATEGORY III

AC 1000A rms
Measuring circuit voltage :
AC 300V rms

IM CL360 i

ii

IM CL360

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 electri­cally 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 condi­tions specified in EN 61000-4-3:1997.

● If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.

IM CL360 iii

1. Instrument Layout

(1)

(2)

(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.

(7)

(6)

OFF

(5)

(See Analogue Output in chapter 4. Specifications) Insert output cord
Model 91020 into this terminal for monitoring waveform with an oscillo­scope, 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".

(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.

IM CL360 1

(8)

(4)

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

IM CL360 3

2 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

LoadLoad

In case of 1-phase 3-wire system,
clam four wires for measurement.

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. Oth­erwise, accurate measurement cannot be made. The maximum measur­able 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 electro­magnetic 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 fre­quency, 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 attenua­tion 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.

4 IM CL360

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

(2) The peak hold display reads 1/

an RMS reading will be obtained when the current under test has a sinu­soidal waveform.

Input Current

Peak Hold Current Output
(display value & DC output)

(3) Slide the peak hold switch back to the OFF position for a reset.

of the peak current value. Therefore,

IP

IP

NOTE

● Model CL360 uses an analogue peak hold circuit to ensure a quick re­sponse 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 recti­fying 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

100％

90％

10ms

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 re­sponse 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.

Hold Capacitor Voltage

t

100％

90％

100ms

t

IM CL360 5

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.

Frequency

（WIDE）

selection

I - V

CT

Conversion

(50/60Hz)

SW

High cut

Filter

(1) (2) (3)

Selection switch

Rectifying

Peak hold

circuit

(100ms or
10ms）

(OFF)

Peak hold

circuit

divider

Voltage

circuit

1

（ )

2

Display

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

2

signal, and outputs 1/

of 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.

6 IM CL360

Example 1 When measuring the peak of starting current of motor:

(1) (2) (3)

Input waveform

(I-V circuit output)

Frequency

Selector Wave at

WIDE position

Surge pulse at switching on
(switching noise)

Frequency

Selector Wave at

50/60Hz posi tion

Waveform after passing through high-cut filter

Example 2 When measuring the peak current of thyristor:

(1) (2) (3)

Input waveform

(I-V circuit output)

Frequency

Selector Wave at

WIDE position

Rectifying

circuit in put

Rectifying

circuit input

Peak hold circuit

(Hold value)

Peak hold circuit

(Hold value)

IM CL360 7

Frequency

Selector Wave at

50/60Hz position

Waveform after passing through high-cut filter

8 IM CL360

Example 3 When measuring the peak current of inverter (where harmonic are

superimposed on the fundamental frequency):

(1) (2) (3)

Frequency

Selector Wave at

WIDE position

Frequency

Selector Wave at

50/60Hz posi tion

Input waveform

(I-V circuit output)

Waveform after passing through high-cut filter

Rectifying

circuit input

Peak hold circuit

(Hold value)

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.

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/
and outputted.

OFF

Model CL360

(connect to oscilloscope or multimeter)

AC output

2

of a peak current value can be held

Model 91020 (optional)

Note : Put a cap on the plug when not in use.

Connect to multimeter or recorder

DC outputAC output

DC output

Black(COM)

Red(DC)

CAP

Blue(AC)

IM CL360 9

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 bat­tery.

CAUTIOIN

Make sure to install battery in correct polarity as indicated in battery com­partment.

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.

Multimeter

RecorderOscilloscope

10 IM CL360

4. Specifications

Instrument Specifications

● Measuring Ranges and Accuracy (at 23 ±10°C, 85% relative humidity or
less)

AC Current

Ranges

200mA 0 to 199.9mA

2A 0 to 1.999A

20A 0 to 19.99A

200A 0 to 199.9A

1000A

A

Measuring

range

0 to 500A

501 to 1000A

Accuracy

Frequency

WIDE 50/60Hz

±1.0% rdg ±2dgt
(50/60Hz)
±3.0% rdg ±2dgt
(40 to 1kHz)

±1.5% rdg ±2dgt
(50/60Hz)
±3.5% rdg± 2dgt
(40 to 1kHz)
±1.5% rdg ±2dgt
(50/60Hz)
±3.5% rdg ±2dgt
(40 to 1kHz)
±5% rdg (50/60Hz)
±10% rdg (40 to 1kHz)

±1.5% rdg ±2dgt

±2.0% rdg ±2dgt

±2.0% rdg ±2dgt

±5.5% rdg 10min.

Time limit
for Meas­urements

Continuous

Remove

this screw

6F22 Battery

IM CL360 11

1000A range

Attenuation (dB)

Typical frequency characteristics
for 2A and higher ranges with the
frequency selector switch at WIDE
position.

Typical characteristics for 200mA
range with the frequency sel ector
switch at WIDE position.

All ranges

With the frequency selector switch
set at 50/60Hz position to cut off
higher frequencies -24dB/oc t

Frequency (Hz)

Errors as aginst reading at 50Hz (%)

12 IM CL360

Analogue Output (Output impedance: Approx. 1kΩ)
AC Output

Range

200mA 0 to 200mA

2A 0 to 2A

20A 0 to 20A

200A 0 to 200A

1000A

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.

Measuring range AC Output Voltage

0 to 200mV

0 to 500A 0 to 50mV ±3.0% rdg

501 to 1000A 50 to 100mV ±5.0% rdg

±2.0% rdg

±2.5% rdg

Accuracy

DC Output

Range

Measuring range

200mA 0 to 200mA

2A 0 to 2A

20A 0 to 20A

200A 0 to 200A

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

DC Output

Voltage

0 to 200mV

Accuracy (Frequency Range)

Freq. Selector

Switch at WIDE

position

±3.0% rdg ±3.5% rdg

±3.5% rdg ±4.0% rdg

Freq. Selector

Switch at 50/60Hz

position

 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

● 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 : 10MΩ or 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.

2

of the peak current is displayed, which means an RMS reading will

1/
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 condensa­tion.

IM CL360 13

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, con­tact 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
Display reading
remains frozen.

Transformer jaws buzz
when measuring large
current.
The lowest digit of
reading is unstable

Output cable
(Model 91020) does not
output voltage.

Calibration
It is recommended that the instrument be calibrated once every year.

Battery is improperly installed.
Battery is exhausted.
Data hold button is pressed in.
Peak hold switch is at ON
position.

-----------------

-----------------

The cable is open circuit. Check the cable for an open

Install the battery correctly.
Replace the buttery.
Release data hold button.
Set peak hold switch to OFF
position.
This is not a failure

This is not a failure. The
instrument is highly accu­rate, so it senses slight
variations in the current
under test.

circuit.

14 IM CL360

IM CL360 15

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

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電話：[phone] ファクシミリ：0422-55-8953

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KIM1JE-2003.2