Testboy TV 455 - Page 35

®
TV 450/455 Resistance of earth connection
35
measured resistance. The lead compensation is therefore a very important feature to
obtain correct result.
Each of R LOWΩ and CONTINUITY has own compensation.
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
/
L
3
p
rolongation lead
Figure 5.13: Shorted test leads
Compensation of test leads resistance procedure
 Select R LOWΩ or CONTINUITY function.
 Connect test cable to the instrument and short the test leads together (see figure
5.13).
 Press TEST to perform resistance measurement.
 Press the CAL key to compensate leads resistance.
Figure 5.14: Results with old calibration
values
Figure 5.15: 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.