YOKOGAWA CL235 User Manual
r
User’s
Manual
CL235
Clamp-on Tester
クランプテスタ
IM CL235
Contents
Precautions for Safety Use of the Instrument ---------------------------i
1. Instrument Layout ------------------------------------------------------------1
2. Measurement ------------------------------------------------------------------ 3
2.1 Preparation for Measurement ------------------------------------------------ 3
2.2 DC Current Measurement ----------------------------------------------------- 3
2.3 AC Current Measurement----------------------------------------------------- 4
2.4 DC Voltage Measurement----------------------------------------------------- 5
2.5 AC Voltage Measurement ----------------------------------------------------- 5
2.6 Resistance Measurement -----------------------------------------------------6
2.7 Continuity Check (400Ω range fixed)---------------------------------------7
2.8 Frequency Measurement------------------------------------------------------ 7
2.9 Peak Measurement ------------------------------------------------------------- 8
2.10 Average Measurement--------------------------------------------------------- 9
3. Other Functions ------------------------------------------------------------- 10
3.1 Sleep Function ----------------------------------------------------------------- 10
3.2 Data Hold Function ----------------------------------------------------------- 10
3.3 LoHz Function------------------------------------------------------------------ 10
3.4 Optional Accessories--------------------------------------------------------- 10
4. Battery Replacement ------------------------------------------------------ 12
5. Specifications ---------------------------------------------------------------- 13
6. Calibration and After-sales Service ------------------------------------ 17
IM CL235
2003.04 初版(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.
DC/AC Voltage/Current
This symbol indicates DC/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.
IM CL235 i
This symbol indicates ground (earth)
WARNING
CAUTION
WARNING
● Never make measurement on a circuit above 600V AC or 600V 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 CL235 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
Input terminal-to-ground voltage
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.
ii IM CL235
Maximum Allowable Input
OVERVOLTAGE CATEGORY III
AC 600A rms / DC 1000A
Measuring circuit voltage : AC 600V rms
DC 600V
AC 600V rms/DC 600V
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 CL235 testers under the condi-
tions specified in IEC801-3:1993.
● If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.
IM CL235 iii
IM CL235 i
1. Instrument Layout
(1)
(2)
(4)
(3)
(5)
(6)
(9)
(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. It is also used to turn power
on.
(4) Data Hold Button : Freezes the display reading. "
display when Data Hold is enabled.
(7)
(8)
(10)
" is shown on the
(5) Mode Selector Button : Selects measuring mode. Press this switch
to cycle through measuring modes. The instrument is in the normal (NOR)
after it is powered up. In any mode, pressing this switch for more than one
second returns the instrument to the NOR mode.
A / V
(ACA/ACV)
Normal
↓
Display
Average
↓
Peak
↓
Frequency
Hz
Button : Used for zero adjustment on DCA and resistance ranges.
(6)
On DCA range, "
completed. This switch is also used to reset the display reading in the
Peak mode.
(7) LCD Display : Field effect type of liquid crystal display with maximum
counts of 3999. Function symbols and decimal point are displayed according to selected function and mode.
AC DC Average mode
Negative sign
Continuity check
Low battery warning
(8) Hi Terminal : Accepts the red test lead for voltage or resistance measure-
ment.
(9) Lo Terminal : Accepts the black test lead for voltage or resistance meas-
urement.
(10) Safety Hand Strap : Prevents the instrument from slipping off the hand
during use.
A/ V
(DCA/DCV)
Normal
↓
Average
↓
Peak
Display
(Resistance/Continuity)
Resistance
↓
↓
↓
Continuity
check
Display
Ω
" is shown on the display to indicate auto-zeroing is
Data hold
Resistance
Voltage
Ampere
Low frequency input
Peak mode
DCA auto zero
IM CL235 1
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 and mode are set to the desired position
before measurement.
2.2 DC Current Measurement
WARNING
● Do not make measurement on a circuit above 600VDC. This may cause
shock hazard or damage to the instrument or equipment under test.
● Do not make measurement with the test leads plugged into the instrument.
Correct Wrong
(1) Set the Function Selector switch to the "
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. When zero adjustment is completed, "
play.
(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 CL235 3
A" position. "DC" should be
" appears on the dis-
2 IM CL235
NOTE
● During current measurement, keep the transformer jaws fully closed. Otherwise, accurate measurement cannot be made. The maximum measurable conductor size is approx. 33mm in diameter.
● When the current flows from the upside (the display side) to the underside
of the instrument, the polarity of the reading is positive and vice versa.
● Turing the Function Selector switch to a position other than DCA cancels
the zero adjustment.
2.3 AC Current Measurement
WARNING
● Do not make measurement on a circuit above 600VDC. This may cause
shock hazard or damage to the instrument or equipment under test.
● Do not make measurement with the test leads plugged into the instrument.
Correct Wrong
(1) Set the Function Selector switch to the "
shown on the upper left corner of the display.
(2) Press the open/close lever to open the transformer jaws and clamp them
onto a single conductor and take the reading on the display. The most
accurate reading will be obtained by keeping the conductor at the center
of the transformer jaws.
NOTE
● During current measurement, keep the transformer jaws fully closed. Otherwise, accurate measurements cannot be taken. Maximum conductor
size is 33mm in diameter.
● Zero adjustment is not necessary in AC current measurement. There is no
polarity in the reading either.
● When the current under test measures 3% of the full scale or less, or the
frequency of the current is low, "LoHz" is indicated on the display.
4 IM CL235
A" position. "AC" should be
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