Multi ALCL-40L User manual

Thank you very much for selecting our ALCL-40L Leakage
ClampTester forArrester .
This model is complex instrument and employs a very reliable
mechanical/electronic design. Before you use your new
instrument, read this instruction manual completely and
familiarize yourself thoroughly with all functions. With proper
use and care, your tester will give you years of satisfactory
service.
Multi Measuring Instruments Co., Ltd.
Akihabara murai-Bldg. 7F,
1-26 Kanda Sakuma-cho,
Chiyoda-ku,Tokyo, 101-0025 Japan
Tel: [phone]
Fax: [phone]
Leakage Clamp Tester
forArrester
ALCL-40L
Instruction Manual
CONTENTS
1. General………………………………………………………………………….....1
2. Safety summary…………………………………………………………………...2
3. Specification………………………………………………………………………..4
4. Name of parts….…………………………………………………….…………….6
5. Measurement…….……………………………………………………………......8
5-1. Replacement of batteries…………………………………………………….8
5-2. Motor operation……………………………………………………………….9
5-3. Measuring method……………………………………………………………9
5-4. Stopper………………………………………………………………………10
6. Maintenance……………………………………………………………………...12
7. Warranty………………………………………………………………………….13

1
1. General
ALCL-40L is a specially designed clamp tester for the leakage and harmonics current
measurements of grounding line of oxide surge arrester. It measures very low
leakage current, fundamental harmonics current and 3rd harmonics current with the
least influence from the external magnetic field to warn that an arrester is damaged or
deteriorated. The motor driving mechanics for the opening and closing of CT sensor
is used for safe operation.
2
2. Safety summary
This instrument has been manufactured and inspected in our factory before
shipment.
If used for its intended purpose, safety of the user and of the instrument is assured.
The device may only be operated by properly trained personnel who are capable
of recognizing the dangers associated with the measurement of electrical current
and voltage.
Read the operating instructions completely and carefully before using the instrument,
and follow all instructions written herein.
Meaning of symbols on the instrument:
Warning and Caution concerning a source of danger
(Read the manual with special care before use.)
CAUTION
●Do not use or storage the instrument under the direct sunshine, high humidity
and temperature, as it maycause the insulation defect of the instrument.
●Do not use the instrument nearby the appliance or machine which generate the
strong magnetic field, as it may cause the measuring error of instrument.
●Do not apply the mechanical vibration or shock to the any parts of CT sensor.
●During transportation, always set CT switch to “NEUTRAL” position.
●This instrument is not water or dust-proof structure. Do not use this
instrument in the dusty environment or in the rain, as it may cause the serious
accidentor defect of the instrument.

3
Warning
●Before operating this instrument, familiarize yourself with all instructions outlined
in this manual.
●The instrument must only be used by suitably trained competent parsons.
●Always check to make sure that the function switch is set to the proper position.
●When making measurements, use CAUTION as dangerous voltages may be
present in normally safe areas.
●When making measurements, do not touch any conductive parts of the
equipment under test. For safe operation, the use of rubber insulation glove
is recommended.
●The instrument should not be used if any part of the instrument is damaged.
The CT sensor must be good order with no broken or cracked insulation.
●To avoid electrical shock, use CAUTION when working above 60V DC or 25V
AC rms. Such voltages pose a shock hazard.
●Do not disassemble the CT sensor or instrument.
●Do not remove the stopper in normal operation, it may cause the serious
problem of the instrument.
POSSIBLE ELECTRICALSHOCK
●If excessive current is applied to the CT sensor, the instrument will be heated
and damaged. Use the instrument within the rated current.
●This instrument is designed to measure the grounding line of arrester, do not
measure the live power line.
●Do not use the instrument, if any part of the CT sensor is damaged.
●Do not measure the uninsulated conductor.
4
3. SPECIFICATIONS
CT Sensor
CT max. opening size : φ37mm
Opening/closing of the jaw : Motor operation
Withstanding voltage : AC 2300V, 1 minute (between the core of CT and CT
outer case)
Measuring and display unit
Measuring function : Leakage current, harmonic current (Fundamental & 3rd
harmonics)
A/D converstion : Dual slope integration mode
Measuring range : AC 0-300μA/3mA/30mA(3range manual)
Input frequency : 45-60Hz (Fundamental frequency)
AC conversion : AC coupled true rms responding
Display : LCD, max. 3200 count
Sampling : 2 times/sec.
Over indication : “OL” mark on LCD
Low battery indication : “ ” mark on LCD
Data hold indication : “DH” mark on LCD
Auto power off function : Approx.10 minutes later after power on
Power supply : AAsize alkaline battery × 4
Limitation of circuit voltage : Less thanAC500Vrms
Operating temperature : 0-40℃, less than 80%RH
(Without condensation)
Storage temperature : -10~60℃, less than 70%RH
(Without condensation)
Dimensions : 160(W)×950(L)×84(D)(When retracted)
: 160(W)×2680(L)×84(D)(When stretched)
Weight : Approx.2.6kgs
AC Current
Accuracy (23℃±5℃, less than 80%RH)
Range Resolution Accuracy(45～65Hz) Max. input Current
300μA 100nA(0.1μA) ±1.2%±8digit
40Arms
3mA 1μA(0.001mA)
30mA 10μA(0.01mA)
Crest factor : <3 (0-50% of the range)
<2 (50-100% of the range)

5
Harmonic Current Measurement (Fundamental & 3rd harmonics)
Measuring method : PLL method
Minimum fundamental current input : More than 3% of fullscale in each range
※Accuracy : (1%±5digit)±(Basic accuracy of ACA)
–(Error by neighboring harmonics)
Accessories
CT cover case…………..1
Instruction manual……....1
※Accuracyspecified: More than 4% harmonics are necessary against
fundamental harmonics
6
4. Name of parts
①CT sensor : Current detection sensor.
②Motor : Driving motor for opening and closing of CT sensor.
③ CT switch : CT OPEN ; Press this switch upward to open the CT
(
CT OPEN/NUETRAL/CT CLOSED ) sensor.
NEUTRAL ; Set this switch to “NEUTRAL” position to
stop the driving motor.
CT CLOSED; Press this switch downward to close CT
sensor.
φ37

7
④ Poweron/offswitch : Pushthisswitchonce,powerwillbeturnedonand
push again for power off.
(Power will be tured off automatically 10 minutes later
after power on.)
⑤ Range switch : Manual range selection switch for 300μA, 3mA& 30mA
range.
⑥ Mode switch : Selection switch for the leakage current (RMS),
fundamental harmonics current (1st H) or 3rd harmonic
current (3rd H) range.
⑦ Data hold switch : Push this switch once, “DH” mark will be displayed
on LCD and the displayed value will be held. Push gain
to release the data hold function.
⑧ Display : LCDdisplayformeasuredvalueandbatterycondition.
⑨ Battery cover : To replace the batteries, remove the battery cover.
⑩ Grip : Grippartforhandle.
⑪ Stopper : When the motor is broken with the conductor clamped,
pull out this stopper to release it. However, this is for
emergency only. Do not remove the stopper in
normal operation.
CAUTION
The removing of stopper is allowed to use only for emergency.
Do not touch this stopper in normal operation, as CT may not be fixed again after
pulling out the stopper.
8
5. Measurement
5-1. Replacement of batteries
①Make sure that the power is turned off.
②Make sure that theCT switch is set to “NEUTRAL” position.
③Remove the battery cover.
④Pull the string, and take out the battery case.
⑤Replace the batteries (1.5V AA size alkaline battery × 4) observing the correct
polarity.
⑥Install the battery case and cover as same as before.
(Pull the stringand take out the battery case.)
NOTE: When the batteries becomes exhausted or drops below the operating
voltage, “ ” mark is displayed. It is necessary to change the batteries
without any delay.
Warning
POSSIBLE ELECTRICALSHOCK
●Do not make measurements with the battery cover off.
●Disconnect the conductor under test before replacing the batteries.
CAUTION
●If the tester isnot used fora long period of time, remove the batteries from the
instrument to prevent the damage caused by battery liquid leakage.
●When replacing the batteries, do not mix the different type of batteries, or new
and old batteries.

9
5-2. Motor operation
●Opening method of the CT sensor
Set ‘CT switch’ to “CT OPEN” position, the CT sensor will be opened by the
motor driving. Make sure to stop the driving motor by setting ‘CT switch’ to
“NEUTRAL” position when reached to the opening end.
●Stopping method of the driving motor
Set ‘CT switch’to “NEUTRAL” position, the driving motor will be stopped.
After clamping the conductor to be measured, always set ‘CT switch” to
“NEUTRAL” position.
●Closing method of the CT sensor
Set ‘CT switch’ to “CT CLOSE” position, the CT sensor will be closed by the
motor driving.
When the CT sensor is closed completely, the motor will be stopped
automatically by the limit switch equipped in the closing end.
After closing, do not apply any mechanical vibration or shock to the CT
sensor, it may cause the chattering of the limit switch, but this is not
abnormal.
After clamping the conductor to be measured, always set ‘CT switch’ to
“NEUTRAL” position.
5-3. Measuring method
①Clamp the grounding conductor of the arrester to be measured.
(Refer to ‘5-2 Motor operation’ for opening and closing of the CT sensor.)
②Set ‘Power on/off switch’ to “ON” to power on the measuring circuit.
NOTE: This power switch is not related to the power on/off function of
driving motor.
CAUTION
During opening or closing of CT sensor, never apply the mechanical vibration or
shock to the CT sensor, it will cause the alignment problem of the CT sensor.
10
③Set ‘Mode switch’ to “RMS” position and set ‘Range switch’ to the suitable
range.
④Read the displayed value.
⑤If necessary, set ‘Mode switch’ to “1st H” or “3rd H” for the measurement of
the fundamental harmonics current or 3rd Harmonics current.
⑥After measurement, remove the CT sensor from the conductor under test.
(Refer to ‘5-2 Motor operation’ for opening and closing of the CT sensor.)
⑦Verify ‘CT switch’ is set to “NEUTRAL” position.
5-4. Stopper
CAUTION
●If excessive current is applied to the CT sensor, the instrument will be heated
and damaged. Use the instrument within the rated current.
●This instrument is designed to measure the grounding line of arrester, do not
measure the active power line.
●When setting the measuring range, always set ‘Mode switch’ to “RMS”.
Otherwise, it may cause the measuring error.
●The power will be turned off automatically 10 minutes later after power on.
●During measurements, do not apply any mechanical vibration or shock to the
CT sensor.
When the motor is broken with the
conductor clamped, pull out the stopper as
shown in the drawing.
Open the CTsensor manually, and
remove the CT sensor from the conductor
under test.

11
Warning
When removing the CT sensor from conductor, use CAUTION as dangerous
voltage may be present.
CAUTION
The removing of stopper is allowed to use only for emergency.
Do not touch this stopper in normal operation, as CT may not be fixed again after
pulling out the stopper.
12
6. Maintenance
When making requests for repair service, please bring the instrument directly to the
dealer. If this is impossible, however, send the instrument directly to our sales office.
When mailing this instrument, always pack it in its original or equivalent packing
material and pack together with name, address, telephone number and the warranty
documentation.
●To ensure speedy and reliable repair, always include information of the type of
failure and cause.
●If required, always return accessories with the instrument.
●When contacting us, provide the model number and serial number of your
instrument.

13
7. Warranty
The instruments are subject to strict quality control. However, should the instrument
function improperly during daily use, you are protected by our 12 months warranty
(valid only with invoice). We will repair free of charge any defects in workmanship
for our original defect. Any damage due to dropping, incorrect operations and use,
or repair/modification made by unauthorized person are not covered by the warranty.