METREL MI 3125 - Measurements; Test Lead Resistance Compensation

MI 3125 InstaltestCOMBO Compensation of test leads resistance
25
5 Measurements
5.1 Compensation of test leads resistance
This chapter describes how to compensate the test leads resistance in R LOWΩ, and
SOCKET test. Compensation is required to eliminate the influence of test leads
resistance and the internal resistances of the instrument on the measured resistance.
The symbol is displayed if the compensation was carried out successfully.
Circuits for compensating the resistance of test leads
N
/
L
2
L
/
L
1
L
/
L
1
P
E
/
L
3
N
/
L
2
P
E
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L
3
p
rolongation lead
Figure 5.1: Shorted test leads
Compensation of test leads resistance procedure
 Select R LOWΩ, or SOCKET test function.
 Connect test cable to the instrument and short the test leads together (see figure
5.1).
 Press TEST to perform resistance measurement.
 Press the CAL key to compensate leads resistance.
Figure 5.2: Results with old calibration
values
Figure 5.3: Results with new calibration
values
Note:
 The highest value for lead compensation is 5 Ω. If the resistance is higher the
compensation value is set back to default value.
is displayed if no calibration value is stored.