MULTI MEASURING INSTRUMENTS CO.,LTD. M-140 Instruction Manual

When%measuring%the%leakage%current%close%to%large%current%line%
or large%magnetic%field,%the%measurement%may%be%influenced.
Display%may%be%come%unstabled%and%measurement%error%may%be%
caused.

OPERATIONPRECAUTIONS

BATTERIESREPLACEMENT

CAUTION

M-140%cannot%be%used%to%measure%the%circuit%which%exceeds%300A.
CT%may%become%too%hot%and%may%cause%the%damage.

●

Before%using,%Please%inse r t%the%batteries%suppli ed%as%a%standard%accessor y%

%%%%referr ing%to “BAT TERI ES %REPL ACE MENT” in%this%manual.

●

When%the%battery%becomes%exhausted%or%drops%below%operating%voltage,%

%%%%the “

” mark%is%displayed.

●

Avoid%using%the%M-140%in%areas%subject%to%sudden%changes%in%temperature.

CAUTION

OPERATION

Set%the%power%swich%on.
Set%the%Range%switch%to%a%range%appropriate%to%the%current%to%be%%%%%
measured%as%follows:
Load%Current,%30/300A（30/300mA%in%case%of%small%current

）

Leakage%Curr ent,%30/300mA
Open%CT%by%pressing%CT%opening%lever%and%clamp%the%conductor.Close%
CT%completely%by%releasing%the%lever.%Follow%the%procedures%meutioned%
below:

1.

2.

3.

4.

5.

6.

（1）

Measurement%of%load%current%single%phase%and%three%phases:

%%%%%%Clamp%only%one%conductive%line.

（2）

Measurement%of%leakage%current.

%%%%%%Earth%Line:%Clamp%earth%line.

Zero%phase%Detection:%Clamp%all%lines.

Note :%Clamp%al l%three%lines%i n%case%of%si ngle%phase%three%wires%and
%%%%%%%%%%clamp%allfour%lines%in%case%of%three%phase%four%wires.

Read%the%displayed%value.
If%you%make%measurements%in%a%dark%place%or%in%a%place%where%it
%is%difficult%to%see%the%readings,%use%the%data%hold%switch.
If%you%wish%to%use%M-140%fur ther%aft er%t he%automat ic%power- of f%
function%has%op e rated,%either%press%the%DATA%H. sw itch,%or%set%
Power%switch%off%and%then%return%it%to%on.
After%using,%set%the%power%switch%to%“OFF ”

●

After%observing%the%power%switch%is%set%to%OFF,%remove%the%bat ter y%cover

%%%%located%on%the%unit%back.

●

Insert%the%LR-44%or%SR-44%into%the%battery%case%making%sure%that%proper

%%%%polarit y%i s%ob served.

●

Always%replace%both%batte rise%at%the%same%time.

Single%phase Three%phases

Pul l%up

Place%batteries%with%positive%
side%up.