MI 3108 EurotestPV
Measurements
– a.c. LV installations
40
5 Measurements
– a.c. LV installations
5.1 Compensation of test leads resistance
This chapter describes how to compensate the test leads resistance in Continuity
function. Compensation is required to eliminate the influence of test leads resistance and
the internal resistances of the instrument on the measured resistance. The lead
compensation is therefore very important to obtain correct result. There are two separated
calibration values:
- one for r
1
, r
N
, r
2
, R
1
+R
2
and R
2
,
- one for R
1
+R
N
.
The
symbol is displayed in the Continuity message fields if the compensation was
carried out successfully.
Circuits for compensating the resistance of test leads
Figure 5.1: Examples of connections for compensation
Compensation of test leads resistance procedure
Select
Continuity
function.
Connect
test cable to the instrument and short the test leads together
appropriately (see
figure 5.1
).
Press
CAL
key to perform
test lead compensation.
If the leads were successfully calibrated the resistance with old calibration data
is displayed first and 0.00Ω afterwards.
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
. If the resistance is higher the
compensation value is set back to default value.
is displayed if no calibration value is stored.
