Note
● (*4) This instrument conducts a Preliminary measurement before
conducting the Protective conductor resistance measurement. In
the case that the resistance value exceeds 20Ω, no and Con
are alternately displayed on the LCD, and the next measurement in
the sequence will not be conducted.
● Extension leads and appliances with long mains leads have a
greater resistance allowance for earth
continuity. Please refer to the
table.1 on page 11.
● (*5)This instrument displays the test results of the protective
conductor resistance as follows.
Green (RPE≦0.1Ω) = Pass for all appliances
Orange (0.1Ω<RPE<0.3Ω) = Pass for appliances with extended
mains leads
Red (RPE≧0.3Ω) = Fail
● (*6)This instrument has a Re-Start function.
It can proceed to the next step by pressing the Start switc
h again
even if the result was a fail.
● Th i s i n s tr u m ent wi l l a u to m a tic a lly be p owe r ed o ff a fte r
approximately 10 minutes if no key operation is carried out.
#
WARNING
● Do not connect the M-7242 to main power supply. And do not
apply any voltage to the test socket.
#
CAUTION
● Follow the procedure described in 5.3 and undertake the Null
setting before taking a measurement, but use the short KAMP
S
lead instead of the M-7242 test lead, by plugging the KAMP
S.into the Extension Lead Adaptor terminal and the UK socket
on the front of the unit.
● When the terminal is open or the resistance value exceeds the
measuring range, > (over range display) appears on the
LCD.
● Do not touch the device under test whilst testing is in
progress. Since a high voltage of 250V or 500V will be present,
the
user may get an electrical shock.
● When the measurement function is completed, turn the
function switch back to the OFF position to turn off.
Measuring
method
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