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
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