Hioki IR4053, Instruction Manual, Page: 48 / 88

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Low Resistance Measurement (IR4056 and IR4057-50 only)
3.8 Low Resistance Measurement
(IR4056 and IR4057-50 only)
This function is only available on the IR4056 and the IR4057-50.
WARNING
Do not measure under a live circuit condition.
CAUTION
If active circuits are connected to the measuring object
circuit in parallel, the impedance and transient current of
the parallel circuit could cause measurement errors.
The comparator function can be used during low resistance
measurement. See “3.4 Comparator Function” (p. 31)
For accurate measurements, be sure to perform zero adjustment
before measuring, to cancel the wire resistance of the test leads.
Zero adjustment can be performed with readings of up to a
maximum of 3
Ω
. When the reading exceeds 3
Ω
,
[Err 1]
or
[Err 0
Ω
ADJ]
will be displayed, and zero adjustment will not be
possible. Wire the instrument so that the wiring resistance is 3
Ω
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
HIOKI IR4057B961-00