Sekotech ST-300 SPIDER, Руководство по эксплуатации, Страница: 55 / 68

OPERATING MANUAL
53
2. Distances to anomalies with peak responses in
non-paired couples of wires vary insignificantly (72.6
– 73.2m).
3. The lengths of twisted pairs are shown as different
and greater than those of non-paired couples of wires
(this can be explained by different coil lengths, and,
accordingly, different total lengths of the wire).
Fig. 56 shows the results of testing the same cable,
but with wire #1 broken . Comparison with the
reference (Fig.55) yields the following differences:
1. Interaction in different twisted pairs is not the
same: the pair “1” - “2” exhibits stronger inductance/
capacitance interaction than the other three twisted
pairs.
2. Distances to anomalies with peak responses
in different “cross-pair” combinations of wires are
different: in all of those that include wire #1, distance
to the anomaly is 19.8 to 21.6m.
3. Interactions between wires from different twisted
pairs are different; combinations with wire #1 show
stronger interaction.
This situation requires testing all the combinations
with wire #1 from both ends (3.6.1).
Fig. 57 shows the results of testing the same cable,
but with an electronic device series-connected
to wire #1 . Comparison with the reference (Fig. 55)
yields the following differences:
1. Interaction in different twisted pairs is not the
same: the pair “1” - “2” exhibits weaker inductance/
capacitance interaction than the other three twisted
pairs.
2. Distances to anomalies with peak responses
in different “cross-pair” combinations of wires are
different: in all of those that include wire #1, distance
to the anomaly exceeds distances to the end of the
cable in all the other “cross-pair” wire combinations.
3. Interactions between wires from different twisted
pairs are different: combinations with wire #1 show
stronger interaction.
This situation requires testing all the combinations
with wire #1 from both ends (3.6.1).
Fig.56
Fig.57
Fig.58
Fig. 58 shows the results of testing the same cable, but with an electronic device parallel-
connected to the twisted pair “1” – “2” . Comparison with the reference (Fig.55) yields the following
differences:
1. Interaction in different twisted pairs is not the same: the pair “1” - “2” exhibits stronger inductance/
capacitance interaction than the other three twisted pairs.
2. Distances to anomalies with peak responses in different “cross-pair” combinations of wires are
different: in all of those that include wires #1 and #2, distance to the anomaly exceeds distances to the
end of the cable in all the other “cross-pair” wire combinations.
3. Interactions between wires from different twisted pairs are different: combinations with wires #1
and #2 show weaker interaction.
This situation requires testing the “1” – “2” pair from both ends (3.6.1).