12
to hold the R
4
10 push-button depressed during the test (8455 V3). The POINTS
value noted in this test is the reference value by which the open line will be
evaluated.
f.
Move the test clip from the good conductor to the open conductor.
g.
Repeat step “e”, except
do not
change the setting of the BATTERY ADJUST-
MENT control. Note the POINTS value of the meter deflection.
h.
The relative values of the meter deflections in steps “e” and “g” indicate
approximate distance to the open.
i.
The chart below provides a rough approximation of the distance to the open
for various deflection POINTS of the open line as a percentage of the deflec-
tion POINTS of the good line.
Open Line “POINTS”
Approximate
(as % of good line “POINTS”)
Distance To Open
100 ......................................... 100% of line length
90 ......................................... 80% of line length
80 ......................................... 60% of line length
60 ......................................... 45% of line length
40 ......................................... 30% of line length
20 ......................................... 15% of line length
10 ......................................... 10% of line length
5 ......................................... 5% of line length
15.
TEST FOR SPLIT
15.1
Identify Split Conductor of Line #2.
a.
Open all four conductors at the near end.
b.
Strap short across line #1 at the near end.
c.
Strap short across line #1 at the far end.
d.
Set the Instrument to measure resistance (ON/OFF switch to ON; “Press for
Ohms” depressed, 8455A).
e.
Connect one test clip to strapped connection of line #1.
f.
Connect the other test clip first to one conductor of line #2 and then the other
conductor. The conductor that causes a deflection of the meter is the split
conductor of line #2.
FAR
END
T
R
T
LINE # 2
LINE # 1
8455
ON
NEAR
END
R
T
R
T
CONDUCTORS OPENED FOR TEST
FAULT
R
X
X
X
X
STRAP
STRAP
Figure 15-1. Test for Split
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