MULTI MEASURING INSTRUMENTS MCL-550D User manual

AC LEAKAGE/LINE CURRENT
DIGITAL CLAMP-ON TESTER
MODEL MCL-550D
INSTRUCTION MANUAL
Thank you very much for selecting our digital AC Clamp-on
Tester MCL-550D.
This model is complex instrument, employing a very reliable
mechanical/electronic design.
Before you use your new instrument, read this Instruction
Manual completely and familiarize yourself thoroughly with
all functions.
Keep this manual carefully to take out whenever you need.
MULTI MEASURING INSTRUMENTS CO.,LTD.
Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, Japan, 101-0025
TEL : [phone] FAX : [phone]
Home Page : http://www.mutimic.com/
E-mail : [e-mail]

1. FEATURES
●Multi functional clamp-on tester.
●Additional AC/DC voltage, resistance, diode test and continuity check.
●Data hold and auto power off function.
SAFETY SUMMARY observe by all means
●To use this instrument safely, read this "SAFETY SUMMARY" carefully and
apply the instrument correctly.
●The CAUTIONs and WARNINGs which appear on the following pages are stated
to prevent the operator & other people from the dangers and their properties from
the damages beforehand.
△WARNING : This symbol indicates the contents "Possibilities of the death or
the serious wound can be supposed" caused from mis-operations.
△CAUTION : This symbol indicates the contents "Possibilities of the injury or
only the material damage can be supposed" caused from mis-
operations.
△ WARNING
POSSIBLE ELECTRICAL SHOCK
This instrument is for the use of low voltage circuit.
Do not make measurements in the circuit more than AC 600V.
Before use, check and confirm the voltage of circuit to be measured.
Apply only the coated cables and do not clamp bare cables.
POSSIBLE ELECTRICAL SHOCK OR ACCIDENT
Do not handle the instrument in the rain, at humid place, with a drop of water and
or with wet hands.
Do not use the instrument if the CT or CT case are damaged and if something is
wrong with the CT cables.Also, do not use leaving the battery cover off.
Do not give the shock to tip of CT.
When replacing batteries, remove the instrument from all circuits to be measured.
It may cause damage of the instrument.
Do not disassemble the instrument.
Do not make measurement of power lines carrying more than 250V for safety.
Do not apply voltage to the both ends of test leads when measuring resistance
and testing diode.

2. SPECIFICATIONS
Safety standard : Meets the requirements for double insulation to IEC 61010-1,
IEC 61010-2-032 installation CategoryⅢ600V phase to earth.
E.M.C. standard : The instrument meets EN 61326 and EN 61000.
Withstanding voltage : AC 5500V, 1 minute (between outer case and core of CT)
Measuring method : Dual integration mode
Jaw opening capability : 55mmφ
Display : 3 1/2 digit LCD max. reading of 1999 and annunciators
Over range indication : Blanking of all digits except MSD1
Low battery indication : "B" mark on LCD readout
Sampling : 2 times/s
Data hold indication : "D･H" mark on LCD readout
Auto power off : The meter is set to power off mode approx. 10 minutes after the
power switch on.
Operating temperature : 0℃to 40℃, ＜80%RH (non-condensing)
Strange temperature :‐10℃to 60℃, ＜70%RH (non-condensing)
Power supply : 1.5V (“AAA”size, R03) x2
Power consumption and battery life : Approx. 5mW, 500 hours continuous.
Size : 85(W)x240(H)x34(D)mm
Weight : Approx. 350g
Accessories : Carrying case…………..1
Instruction manual……1
Batteries…………………2
Test lead…………………1set
Measuring range (23℃±5℃, ＜80% RH without condensation) :
Range
Accuracy
Max. input
~A
(50/60Hz)
Manual range
2000mA
±1.2% rdg±10 dgt
AC2000A
(30 sec.)
200A
〃
1000A
±1.2% rdg±8 dgt
~V
(50/60Hz)
…V
Auto range
2V
±0.7% rdg±5 dgt
AC/DC
750V
20V
±1.2% rdg±5 dgt
200V
〃
600V
〃
Ω
(OHM)
Auto range
200Ω
±1.2% rdg±5 dgt
Input protection
250V rms
(30 sec.)
2KΩ
〃
20KΩ
〃
200KΩ
〃
2000KΩ
〃
20MΩ
±3% rdg±10 dgt
･)))Continuity
check
2KΩ
Continuity beeper
＜Approx. 300Ω
250V rms
(30 sec.)
|
Diode test
2V
±10% rdg±3 dgt
250V rms
(30 sec.)

3. DIMENSIONS AND PANEL FUNCTION
①Current transducer(Jaw)
②Jaw opening lever
③Power switch
④Range selector switch
⑤Data hold switch
⑥LCD display
⑦Input terminal(V)
⑧COM terminal
⑨Input terminal(Ω)( ｜)
⑩Battery cover
○
11 Wrist strap
4. METHOD OF MEASUREMENT
4-1. Measurement of AC Current (～A)
4-1-1 Measurement of Line Current
①Press the power switch "ON".
②Set the range selector switch to the proper
ACA range to be measured.
Start the measurement at top range and
then work down to lower range.
③Open the CT and clamp it to the conductor
to be measured at the center of CT.
Close CT completely.
④Read the current value on the display.
⑤If you make measurements in a dark place
or in a place where it is difficult to see the
readings, use the data hold switch. Fig.1
Note : Clamp around only one conductor of the circuit to be measured. (See Fig.1)
When making the clamp measurements for high AC current, the noise sound
of CT may be caused, however, this is not abnormal.
4-1-2 Measurement of Leakage Current
①For leakage current measurement, clamp CT to the grounding line in the same
manner as for line current measurement.
②This model cannot measure zero phase current accurately by clamping CT to the
plural conductors together (2 wires for single phase, 3 wires for 3 phase, etc.).
Note : The display may show some value even without clamping CT nearby the
conductor and or transformer carrying big current due to the influence of outer
magnetic fields. In such case, operate the instrument in the place apart from
the source of strong magnetism as much as possible.

△
!WARNING
●To avoid electrical shock or damage, the measurement is limited to the circuit
under 600V AC.
Such voltages may cause a shock hazard.
●Never fail to keep the maximum 1000A input to avoid electrical shock or
damage.
●Never make measurements for uninsulated conductors or bus bars.
4-2. Measurement of Voltage
4-2-1. Measurement of AC Voltage
①Set the power switch to "ON" position.
②Connect the plug of red test lead into
the “V”terminal and the plug of black
test lead into the “COM”terminal.
③Set the range selector switch to “ACV~”
range.
④Contact the tips of the test leads to the
circuit under test.
⑤Read the voltage value in the display.
4-2-2. Measurement of DC Voltage
①Set the power switch to "ON" position.
②Connect the plug of red test lead into the “V”terminal and the plug of black test
lead into the “COM”terminal.
③Set the range selector switch to “DCV …” range.
④Contact the tips of the test leads to the circuit under test.
⑤Read the voltage value in the display.

△
!WARNING
Do not make measurements of power lines carrying more than 250V.
IN SOME CASES, POWER LINES MAY CARRY VOLTAGE SPIKES OF
SEVERAL TIMES OF THE NORMAL SUPPLY VOLTAGE. THIS
INSTRUMENT SHOULD NOT BE USED TO MEASURE POWER LINES.
* The term of “POWER LINE”means the electrical circuit providing the
power to factories, buildings, and etc.
△
!WARNING
POSSIBLE ELECTRICAL SHOCK. Do not make measurements if the case
is damaged or the rear case is removed. Remove all electrical inputs before
removing the rear case.
△
!WARNING
POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD. Do not expose this
tester to rain or moisture. Do not operate the tester in the presence of
flammable gases or fumes.
△
!CAUTION
To avoid damage to the tester, disconnect test leads before changing
functions. Do not exceed the maximum input limits.
4-3. Measurement of Resistance and Continuity Check
①Set the power switch to "ON" position.
②Connect the plug of red test lead into
the “Ω”terminal and the plug of black
test lead into the “COM”terminal.
③Set the range selector switch to “Ω”or
“･)))2K Ω”range.
④Contact the tips of the test leads to the
circuit under test.
⑤Read the resistance value in the display.
In continuity check, if the circuit under test has a resistance of less
than approximately 300Ω, the continuity beeper will sound.
△
!CAUTION
Be sure all voltage is turned OFF in the circuit before making resistance
measurement.

4-4. Measurement of Diode
①Set the power switch to "ON" position.
②Connect the plug of red test lead into the “｜”terminal and the plug of black
test lead into the “COM”terminal.
③Set the range selector switch to “｜”range.
④Contact the tips of the test leads to the diode under test.
Fig. 4
As shown in Fig.4 (a), when measuring the forward voltage across the diode, a
normal diode will indicate 0.4 to 0.7V and, as shown in Fig.4 (b) the reverse voltage
will indicate a value near 1.500(battery voltage). For a short-circuited diode, a value
near 0mV will be displayed.
△
!CAUTION
Be sure all voltage is turned OFF in the circuit before making diode test.
5. REPLACEMENT OF BATTERIES
When the battery voltage falls below a specified voltage value, the "B" mark will
appear in the display. If this occurs, replace the two batteries with new ones as
quickly as possible.
Turn the power switch to "OFF", prior
to installing batteries.
To install the batteries, remove the
battery cover located on the unit back.
Loosen the screw on the battery cover.
Replace the two batteries (UM-4 or
type AAA) with new ones, observing
polarity. Use high-quality batteries
which are guaranteed against leakage.
If the instrument is to be left unused
for long periods of time, to prevent
damage from leakage, remove the batteries.

△
!WARNING
Before changing batteries or fuse, remove all electrical input.
6. REPAIR SERVICE
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 as 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.
7. WARRANTY
This instrument is sent out from our factory after the sufficient internal inspections
but if you find any defect due to the fault in our workmanship or the original parts,
please contact the dealer where you bought the instrument.
The warranty period is 12 months from the date of purchase and the instrument
shall be repaired at free of charge, provided that we judge the cause of defect is
obviously resulted from our responsibility.
GURANTEE REGULATIONS
1.This instrument is warranted for the operation under normal use for 12 months from
the date of purchase.
2.This warranty does not cover the following defects:
a. Defect caused from the improper use and operation.
b. Defect caused from the use, operation and storage beyond the original
specifications, designs and conditions.
c. Defect caused from the renovations or repairs done by someone else than us or our
representatives.
d. Defect not caused from our responsibilities.