MULTI MEASURING INSTRUMENTS M-140HC User manual

Thank you very much for selecting our M-140HC Clamp Leaker complying
with hi-voltage line current measurement. This instrument is high reliable
leakage current clamp meter developed by our superior technique.
Before use, read this instruction manual completely and apply this
instrument correctly.
Keep this instruction 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, 101-0025 Japan
TEL: [phone] FAX: [phone]
URL: http://www.multimic.com/
E-mail: [email protected]
COMPLY WITH HI-VOLTAGE PHASE CURRENT MEASUREMENT
CLAMP LEAKER
M-140HC
INSTRUCTION MANUAL

1
SAFETY SUMMARY
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 of power lines carrying 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.
For high voltage current measurement, apply the instrument at low voltage
corresponding field.
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.
Do not disassemble the instrument.

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1. GENERAL
This instrument is a leakage current clamp meter with high precision and wide range
combined by newest CT technologies which enabled to make up CT utilities extremely. Also,
it can measure phase current of CVT and or CV cable in high voltage circuit very simply by
our originally developed measuring method. Until now, it has been very dangerous to open
the circuit by mold disconnector or pillar disconnector due to flow of big arc current. This
instrument can measure phase current and can prevent danger when opening circuits.
2. SPECIFICATIONS
2-1 Current Detection Part
CT Inside Diameter : φ40mm
Method : Split-core type ZCT
Withstanding Volt
. age : AC2200V/1 minute
2-2 Measuring Part
Measuring Function : AC Leakage Current, loading current;
Phase current of hi-voltage circuit (measuring at low
voltage corresponding field).
Measuring Method : CT clamp method (max. applicable conductor φ40mm)
Measuring Range : AC current 0~300.0mA/300A (50/60Hz)
Line current CVT cable and CV cable
Range Swtich : mA, A, Phase Current CVT, Phase Current CV
AC Current Detection : Average sensing
A/D Conversion : Successive approximation method
Display : Max. 3199 count, LCD with annunciator
Over Range Indication : “OL” mark on LCD
Sampling Rate : 2 times/sec.
Data Hold Indication : “DH” mark on LCD
Low Battery Indication : “B” mark on LCD
Auto Power Off : approx. 10 minutes after the final rotary switch
operation.
To power on again, set rotary switch to OFF.
m(meter) Display Switch : The length of high voltage circuit will be displayed in
line current measuring range (estimated value),
calculated by storey capacitance.

3
2-3 General Specifications
Applicable Circuit Voltage : less than AC600V (insulated conductor)
Withstanding Voltage : AC2200V/1 minute between outer case and CT core
Operating Temperature : 0~40oC, less than 80%RH (Non-condensing)
Storage Temperature : -10~60oC, less than 70%RH (Non-condensing)
Power Supply : AAA alkaline battery (LR03)x3
Current Consumption : approx. 3.5mA (approx.. 150h for continuous use)
Dimension & Weight : 45(W)x195(H)x24(D)mm, approx.. 180g
Accessories : AAA battery (LR03) x 3 installed in the instrument,
instruction manual x 1, soft carrying case x 1
2-4 Accuracy
At 23oC ±5oC, less than 80%RH and the conductor to be measured is located in the center
position of CT.
Range Min. Resolution Accuracy
30/300mA 0.01mA ±1.2%rdg ±5dgt
30/300A 0.01A 0~200A:±1.2%rdg ±5dgt
+1.0%
200~250A: rdg±5dgt
-2.0%
+1.0%
250~300A: rdg±5dgt
-3.0%
Phase Current CVT 0mA estimated value
Phase Current CV 0mA

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3. OPERATION PROCEDURE
3-1 Name of Part & Explanation
①Clamp CT : Current detection sensor, clamp-on method
②Open/Close Lever : By pushing to inside, CT will be opened
③Range Switch : For power On/Off, ACmA, ACA, Line Current CVT
and Line Current CV. By auto power off function,
power will be off automatically approx. 10 minutes
after the final switch operation. To power on again,
set rotary switch once to OFF and power on again.
④Frequency Change Switch : Set according to power supply frequency (50 or
60Hz)
⑤Data Hold Switch : By push one time, “DH” sign will be on LCD and the
data will be hold. By push once more, this function
will be released.
⑥“m” Conversion Switch : In case of hi-voltage phase current measurement,
the storey capacitance is 38mA/100m both for CVT
and CV cable. This instrument will show the length
of hi-voltage, incoming line in “m” (meter) by
conversion when no loading at hi-voltage end. By
push one time at hi-voltage line current range, “m”
mode will appear and “mA” mode will become again
by push once more.
⑦Display : Digital display of measured value, unit symbol and
battery sign.
⑧Battery Compartment : Batteries are installed (back side)
⑨Hand Strap : Preventing drop of the instrument by applying to
the wrist during measurement.

5
3-2 Battery Installment
󰅿WARNING
󰅿CAUTION
“B” sign will appear on the display when batteries are exhausted and get less than
operation voltage. Replace to new batteries immediately.
Do not use the batteries mixed new one and once used and or different kind ones.
[How to replace the batteries]
1. Remove the screw fixing battery cover at the
bottom of rear case by plus driver and slide
& remove the battery cover to the direction
of arrow mark.
2. Pick up the exhausted batteries.
3. Confirm the polarities and put the new
batteries.
4. Replace the battery cover to the original
position and fix screw by driver.
POSSIBLE ELECTRICAL SHOCK OR ACCIDENT
Do not replace the batteries under the conditions of measuring current or
voltage
Do not operate the instrument with battery cover off.
When not using the instrument for a long period, remove the batteries and keep
separately. The batteries may leak and may cause damage to the instrument.
→Battery Cover
AAA Alkaline Battery (LR-03) x 3

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3-3 Measurement
To use the instrument safely, follow the contents described in WARNING and CAUTION
without fail.
󰅿WARNING
1) Line Current Measurement
(1) Set range switch③from OFF to [30/300mA] position (display will appear).
(2) Set frequency change switch④to applying frequency (50 or
60Hz).
(3) Open clamp CT①and clamp it to the conductor to be measured
(one line). Close CT completely.
(4) Select most suitable range by rotary switch and read the
displayed value. (In case of over range, “OL” mark will appear on
LCD).
*use data hold⑤where displayed value cannot be seen clearly.
POSSIBLE ELECTRICAL SHOCK
For safety, use the instrument in circuit less than 600V.
Before operation, confirm the circuit voltage to be used.
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 instrument body or CT case are damaged.
Do not use the instrument, leaving the battery cover off.
POSSIBLE FIRE HAZARD AND BURN ACCIDENT
Part of CT will get heat when applying excessive current.
Do not apply more than maximum capable current (300A rms) to CT part.

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2) Leakage Current Measurement
(1) Leakage current measurement at grounding line. The operation is the same
manner as line current measurement.
(2) Leakage current measurement except for grounding line clamp CT to two wires at
single phase and three wires at three phase in a lump.
3) Phase Current Measurement of Hi-Voltage Circuit (with shielded grounding line)
(1) Measurement of CVT Cable
In case of CVT cable as the right drawing, this
instrument can measure phase current by
clamping 1/2 CT to one phase.
CAUTION FOR MEASUREMENT
The measurement by this mode is for estimated
value detection and use it to judge circuit condition
with no loading or loading
△WARNING
This instrument is for low voltage circuit and never
use for hi-voltage cable without shielding.

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①Set range switch③from OFF to “CVT” position (display will appear).
②Set frequency change switch④to applying frequency (50 or 60Hz).
③Clamp 1/2 CT to the cable as drawing shown on P7 and read displayed value.
④The circuit can be opened by disconnector , etc. after confirmed no loading condition.
⑤At no loading condition, the length of hi-voltage incoming line can be displayed at the
estimated value. Clamping 1/2 CT, press “m” conversion switch⑥one time and “m” will
be displayed. By press once more, display will return to “mA”.
(2) Measurement of CV Cable
Move CV cable to the search coil of CT
like as at the right drawing and
read the max. value by keeping close and
turning the instrument for 90o.
① Set range switch③from OFF to 「CV」position (display will appear).
② Set frequency change switch④to applying frequency (50 or 60Hz).
③ Clamp CT to CV cable and move it to search coil of CT.
④ The circuit can be opened by disconnector, etc. after confirmed no loading conditions.
⑤ At no loading condition, the length of hi-voltage incoming line can be displayed at the
estimated value. Reading max. value, press “m” conversion switch⑥one time and “m”
will be displayed. By press once more, display will return to “mA”.
Three Phase Cable
(CV Cable)
Search Coil
Read max. value by
turning for 90o

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4. REPAIR SERVICE
When requesting for repair service, please bring the instrument directly to the dealer where
you bought.
When mailing the instrument, always pack it in its original or equivalent packing materials to
avoid any damage during the transportation and also put together with documents showing
your name, address, phone number and defect point.
5. 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.