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2.8 Low Resistance Measurement
Before measurement, always perform zero adjustment to cancel
the test leads’ wiring resistance and other potentially
problematic quantities. Accurate measurement will not be
possible if zero adjustment is not performed.
2.8
Low Resistance Measurement
IR4051 IR4052
Do not measure under a live circuit condition.
1.
Set the rotary selector to the
:
function.
2.
Short circuit the tip of the test lead.
3.
Pull up the
MEASURE
key.
4.
Turn off the
MEASURE
key to hold the measured value.
5.
Press .
6.
Connect the test lead to the ground side of the object
being measured.
7.
Press the
MEASURE
key and read the displayed value.
8.
Turn off the
MEASURE
key after using.
Zero adjustment can be performed with readings of up
to a maximum of 3
:
. When the reading exceeds 3
:
,
“Err 1” will be displayed, and zero adjustment will not
be possible. Wire the instrument so that the wiring
resistance is 3
:
or less.
In the following circumstances, repeat the zero
adjustment procedure:
• After changing test leads
• When the ambient temperature changes by 1°C or
more
• After replacing the fuse
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