Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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 switch is set to the desired position
before measurement
2.2 AC Current Measurement
WARNING
Never use the instrument on a circuit above 300V AC. This may cause
electrical shock hazard and damage to the instrument or the circuit
under test
Keep your fingers and hands behind the barrier during measurement
(1) Set the Range Switch to the "
"AC" should be 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 24mm in diameter.
User's
Manual
CL120
Clamp-on Tester
Contents
■ Precautions for Safety Use of the Instrument
1. Instrument Layout
2. Measurement
2.1 Preparation for Measurement
2.2 AC Current Measurement
3. Other Functions
3.1 Auto-Power-Off Function
3.2 Data Hold Function
3.3 Optional Accessories
4. Battery Replacement
5. Specification
6. Calibration and After-sales Service
7th Edition: Oct. 2017 (KYOU)
IM CL120
IM CL120
WARNING
• Never make measurement on a circuit above 300V AC.
• Do not use the instrument in an atmosphere where any flammable or
explosive gas is present.
• The transformer jaws are made of metal and their tips are not
insulated. Be especially careful about the hazard of possible shorting
where the equipment under test has exposed metal parts.
• 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 install substitute parts or make any modification to the
•
instrument. Return the instrument to Yokogawa Meters & Instruments
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 CL 120
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.
Function
A
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 Ill.
Measurement category Ill (CAT.Ill):
Distribution level, fixed installation, with smaller transient over-
voltages than CAT IV
Maximum Allowable Input
MEASUREMENT Ill
200ArmsAC
Measuring circuit voltage : 300Vrms AC
CAUTION
3. Other Functions
3.1 Auto-Power-Off Function
This is a function to prevent the instrument from being left powered on
in order to conserve battery life. The instrument automatically turns off
about 10 minutes after the last switch or button operation.
To turn to normal mode, turn the Range switch to "OFF", then to the
desired position.
3.2 Data Hold Function
This is a function used to freeze the measured value on the display.
Press the
regardless of subsequent variation in input. "
right corner of the display while the instrument is in the Data Hold mode.
To exit the Data Hold mode, press the
NOTE
When the Auto-Power-Off function works while instrument is in the data
hold mode, data hold is cancelled.
3.3 Optional Accessories
Clamp Adapter Model 99025 (For AC current measurement only)
Clamp Adapter Model 99025 is designed to
increase the measuring capability of a
clamp meter. With the use of the Clamp
Adapter, you can not only extend current
range over 2000A, but also clamp on a
large bus-bar or conductor.
(1) Set the Range Switch to the "
position.
(2) As shown in the figure below, clamp
Model CL 120 onto the pickup coil of
Model 99025.
(3) Clamp Model 99025 onto the bus-bar or
conductor under test.
(4) Take the reading on Model CL 120 and
multiply it by 10.
NOTE
For the detailed specification, refer to the
Clamp Adapter User's Manual.
■Precautions for Safe Use of the Instrument
When handling the instrument, ALWAYS observe all of the cautionary
notes on safety given below. Yokogawa Meters & Instruments
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 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.
Ground
This symbol indicates ground (ear th)
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.
• 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.
• Use a damp cloth and detergent for cleaning the instrument. Do not
use abrasives or solvents.
NOTE
• Radiation immunity affects the accuracy of CL 120 testers under the
conditions specified in EN 61000-4-3
• If equipment generating strong electromagnetic interference is located
nearly, the testers may malfunction.
1. Instrument Layout
Barrier : It is a part providing protection against electrical shock and
ensuring the minimum required air and creep age distances.
20A" or " 200A" position.
button to freeze the reading. The reading will be held
" is shown on the upper
button again.
A"
4. Battery Replacement
WARNING
T To avoid electric shock hazard, never try to replace batteries during
measurement.
CAUTION
• Do not mix new and old batteries.
• Make sure to install battery in correct polarity as indicated in battery
compartment.
If the battery voltage becomes too low for the instrument to operate
normally, "
Note that when the battery is completely exhausted, the display blanks
without "
(1) Set the Range Switch to the "OFF" position.
(2) Press in the hole on the battery compartment cover with the tip of a
pointed object, then slide open the cover.
(3) Replace the battery observing correct polarity. Use two new LR44 or
SR44 batteries.
(4) Slide the battery compartment cover back in place.
" is shown on the display. Then, replace the battery.
" shown.
5. Specifications
■ Instrument Specification
•
Measuring Ranges and Accuracy (at 23±5℃, relative humidity up to 75%)
AC Current
Range
20A 0 to 19.99A ±2.0% rdg ±7dgt (50 to 1kHz)
200A 0 to199.9A
■General Specification
• Operating System : Dual integration
• Measurement Function : AC current
• Display : Liquid crystal display with maximum counts of 1999
• Overrange Indication : "1" flashes on the highest digi
• Response Time : Approx. 2 second.
• Sample Rate : Approx. 2.5 times per second
• Temperature and Humidity for Guaranteed Accuracy : 23
relative humidity up to 75% without condensation
• Operating Temperature and Humidity : 0 to 40
to 85% without condensation
• Storage Temperature and Humidity: -10 to 50
75% without condensation
• Effect of conductor position: Within 2% difference between maximum
and minimum values to a 10 mm-dia conductor
• Effect of external magnetic field : 0.8 A or less in AC magnetic field of
400A/m
• Power Source : Tow LR44 or SR44 (3V DC) batteries
• Battery Life: Approx. 100 hours (continuous)
• Current Consumption : Approx. 1 mA
• Auto-power-off function : Turns power off approx. 10 minutes after the
last switch operation
• Withstanding Voltage : 4240V AC for 5 sec. between housing case and
metal part of jaws
• Insulation Resistance : 10 MΩ or greater at 1000V between housing
case and metal part of jaws
• Conductor Size : Approx. 24mm diameter max.
• Dimensions: Approx. 59(W) x 147(H) x 26(D) mm
• Weight : Approx. 100g (batteries included)
• Safety Standard: EN 61010-1
• EMC Standard: EN 61326, EN 55022
• Radiation immunity : EN 61000-4-3
• Environmental standard: EN 50581
• Accessories : LR44 battery ............................. 2
• Optional Accessories : Clamp adapter Model 99025
Measuring
Range
±2.0% rdg ±5dgt (50/60Hz)
±3.0% rdg ±10dgt (40Hz to 1kHz)
EN 61010-2-032
(300V AC CAT.Ill, Pollution degree2, indoor use)
Carrying case Model 93033 ...... 1
User's Manual ............................ 1
Accuracy
℃
, relative humidity up
℃
, relative humidity up to
℃
±5℃,
6. 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 Meters & Instruments sales office
• Turn off the POWER switch once, then turn it back on again.
• If the tester does not turn on, replace the battery with a new one.
Calibration
It is recommended that the instrument be calibrated once every year.
Loading...