YOKOGAWA CL255 User Manual
User’s
r
Manual
CL255
Clamp-on Tester
クランプテスタ
IM CL255
Contents
Precautions for Safety Use of the Instrument ---------------------------i
1. Instrument Layout ------------------------------------------------------------1
2. Measurement ------------------------------------------------------------------ 4
2.1 Preparation for Measurement ------------------------------------------------ 4
2.2 DC Current Measurement ----------------------------------------------------- 4
2.3 AC Current Measurement----------------------------------------------------- 5
2.4 DC Voltage Measurement----------------------------------------------------- 6
2.5 AC Voltage Measurement ----------------------------------------------------- 7
2.6 Resistance Measurement -----------------------------------------------------8
2.7 Continuity Check (400Ω range fixed)---------------------------------------8
2.8 Frequency Measurement------------------------------------------------------ 9
2.9 Peak Measurement ----------------------------------------------------------- 10
2.10 Average Measurement--------------------------------------------------------11
3. Other Functions ------------------------------------------------------------- 12
3.1 Sleep Function ----------------------------------------------------------------- 12
3.2 Data Hold Function ----------------------------------------------------------- 12
3.3 LoHz Function------------------------------------------------------------------ 12
3.4 OUTPUT Terminal (For current ranges only)--------------------------- 13
3.5 Optional Accessories--------------------------------------------------------- 14
4. Battery Replacement ------------------------------------------------------ 15
5. Specifications ---------------------------------------------------------------- 16
6. Calibration and After-sales Service ------------------------------------ 20
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.
DC Voltage/Current
This symbol indicates DC voltage or current.
AC/DC Voltage/Current
This symbol indicates AC/DC 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.
IM CL255 i
This symbol indicates ground (earth)
WARNING
CAUTION
IM CL255
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 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 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.
WARNING
To avoid damage to the instrument or electric shock!
The restrictions on the maximum voltage level for which the CL255 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, A
V, V AC 750V rms/DC 1000V
Input terminal-to-ground
voltage
Measuring circuit voltage :
AC 750V rms
DC 1000V
AC 750V rms/DC 1000V
ii IM CL255
Maximum Allowable Input
OVERVOLTAGE
CATEGORY II
AC 2000A rms
OVERVOLTAGE
CATEGORY III
AC 2000A rms
Measuring circuit voltage :
AC 600V rms
DC 600V
AC 600V rms/DC 600V
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.
CAUTION
● Always make sure to insert each plug of the test leads fully into the appro-
priate 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 CL255 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 CL255 iii
1. Instrument Layout
(1)
(2)
(3)
(4)
(7)
(6)
(5)
(12)
(9)
(8)
(10)
(11)
(13)
(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 function to use. Also switches off the
instrument when set to "OFF" position.
(4) Data Hold Button : Freezes the display reading. "
display when Data Hold is enabled.
Note : When the plug is inserted into the output terminal, Data Hold Switch
operates as range selection switch. (See section 3.4 OUTPUT Terminal)
(5)
Mode Selector Button : Selects measuring mode. The instrument
defaults to the normal mode (NOR) Then, press this switch to cycle
through measuring modes. In any mode, pressing this switch for more than
one second returns the instrument to the normal mode.
IM CL255 1
(14)
" is shown on the
A / V
(ACA/ACV)
Normal
↓
Average
↓
Peak
↓
Frequency
Display
Hz
A/ V
(DCA/DCV)
Normal
↓
Average
↓
Peak
Display
(Resistance/Continuity)
Resistance
↓
↓
↓
Continuity
check
Display
Ω
(6)
Button : Used for zero adjustment on DCA and resistance ranges.
Also used to reset the display reading in the PEAK mode. On DCA range,
" is shown on the display when auto-zeroing is completed.
"
(Auto-zeroing is available on 400A range only.)
(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.
AC DC Average mode
Data Hold
Negative sign
Continuity
Check
Low battery warning
Peak mode DCA auto zero
Resistance
Voltage
Ampere
Low frequency
input
(8) Terminal Cover : Slides over Hi and Lo Terminals to prevent access to
them when OUTPUT terminal is in use.
(9) OUTPUT Terminal (For AC or DC current range only) : Provides DC volt-
age output in proportion to the AC or DC current reading. 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 meas-
urement.
(11) Hi Terminal : Accepts the red test lead for voltage or resistance meas-
urement.
(12) Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
2 IM CL255
(13) Test Leads (Model 98011) : Connected to Lo and Hi terminals for voltage
or resistance measurement.
(14) Output Plug (Model 98012) : Plugs into the OUTPUT terminal for con-
nection to a recording device. (See section 3.4, OUTPUT Terminal.)
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 Function Selector switch is set to the desired posi-
tion before measurement.
2.2 DC Current Measurement
WARNING
● Do not make measurement on a circuit above 1000VDC. This may cause
shock hazard or damage to the instrument or equipment under test.
● Do not make current measurement with the test leads connected to the Hi
and Lo terminals.
Correct Wrong
(1) Set the Function Selector switch to the "
A " position. "DC" should be
shown on the upper left corner of the display.
(2) With the transformer jaws closed and without clamping them onto the
conductor, press the
button for about one second to zero adjust
the display. (Zero adjust feature is for 400A range only.) When zero adjustment is completed, "
" appears on the display.
(3) Press the open/close lever to open the transformer jaws and clamp them
onto the conductor under test, then take the reading on the display. The
most accurate reading will be obtained by keeping the conductor at the
center of the transformer jaws.
IM CL255 3
4 IM CL255
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