User's
CL155
Manual
Clamp-on Tester
クランプテスタ
IM CL155
保証書付
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
IM CL155
2018.6 10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 Current Measurement ……………………………………………………… 3
2.2.1 AC Current Measurement (Normal Mode) ……………………………… 4
2.2.2 Peak Current Measurement (Peak Mode) ……………………………… 4
2.3 Voltage Measurement ……………………………………………………… 5
2.3.1 DC Voltage Measurement ………………………………………………… 5
2.3.2 AC Voltage Measurement ………………………………………………… 5
2.4 Resistance Measurement …………………………………………………… 6
2.4.1 Resistance Measurement (Normal Mode) ……………………………… 6
2.4.2 Continuity Check (400Ω range fixed) …………………………………… 6
3. Other Functions ……………………………………………………………… 8
3.1 Sleep Function ……………………………………………………………… 8
3.2 Data Hold Function ………………………………………………………… 8
3.3 OUTPUT Terminal (For current measurement only) …………………… 9
3.4 Optional Accessories ……………………………………………………… 10
4. Battery Replacement ……………………………………………………… 11
5. Specifications ……………………………………………………………… 12
6. Calibration and After-sales Service ……………………………………… 15
■PrecautionsforSafeUseoftheInstrument
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 Users 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.
Ground
This symbol indicates ground (earth)
This symbol 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.
NOTE
Draws attention to information essential for understanding the operation and
features.
IM CL155
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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 allowable 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.
● Do not use the test leads that have deteriorated or are detective.
● Check the test leads continuity
WARNING
To avoid damage to the instrument or electric shock!
The restrictions on the maximum voltage level for which the CL155 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 voltage in power lines.
Maximum Allowable Input
Function
A
V, V
Input terminal-toground voltage
IM CL155
MEASUREMENT
CATEGORY II
AC 2000A rms
Measuring circuit
voltage:
AC 750V rms
AC 750V rms
/DC 1000V
AC 750V rms
/DC 1000V
MEASUREMENT
CATEGORY III
AC 2000A rms
Measuring circuit
voltage :
AC 600V rms
AC 600V rms
/DC 600V
MEASUREMENT
CATEGORY Ⅳ
AC 2000A rms
Measuring circuit
voltage :
AC 300V rms
AC 300V rms
/DC 300V
ii
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 over-
voltages than CAT.III.
Measurement category III (CAT.III):
Distribution level, fixed installation, with smaller transient over-voltages than
CAT.IV.
Measurement category IV (CAT.IV):
Outside and service entrance.
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 CL155 testers under the
conditions specified in EN 61000-4-3.
● If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.
IM CL155
iii
1.InstrumentLayout
(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 ranges. Also used to power the
instrument on.
(4) Data Hold Button : Freezes the display reading. " " is shown on the
display when Data Hold is enabled.
(5) Mode Selector Button : On a AC current (" 400A" or " 2000A" or
the resistance ( ) range. Press the mode button to cycle through the
measurement modes. The instrument is initially set to the normal mode and
can be switched to peak or continuity check mode by means of the mode
button.
IM CL155
1
A / V
(ACA/ACV)
Normal
↓
Peak
Display Display
(Resistance/Continuity)
Resistance
↓
Continuity
check
Ω
(6) Button : Reset the measurement in peak mode.
(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.
(8) Terminal Cover : Slides over Hi and Lo Terminals to prevent access to them
when OUTPUT terminal is in use.
(9) OUTPUT Terminal (For " 400A" or " 2000A" range only) : Provides DC
voltage output in proportion to the AC or DC current reading. (See section
3.3, OUTPUT Terminal.) 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
measurement.
(11) Hi Terminal : Accepts the red test lead for voltage or resistance
measurement.
(12) Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
(13) Test Leads (Model 98072) : Connected to Lo and Hi terminals for voltage
or resistance measurement.
(14) Barrier: It is a part providing protection against electrical shock and
ensuring the minimum required air and creepage distances.
IM CL155
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