Special Applications
Section 2
Page 64
5. Locating Opens by Ratio Quick Reference
Step 1 – Setup:
•
Disconnect the open conductor at both ends
•
Determine the length of the section under test and
record as measurement “D.”
Step 2 – Hookup:
•
Red – open conductor
•
Black and green – shield or other conductor
Step 3 – Measure from near end:
•
Press the ON/RESET key, then the OPENS key
and select NORMAL MODE
•
Press the # (pound) key and select AIRCORE
CABLE
•
Record the RING measurement as “A.”
Step 4 – Measure from far end:
•
Repeat Step 3 from the far end.
•
Record the RING measurement as “B.”
Step 5 – Calculate:
If C
=
A
+
B
and
D
=
section length,
use
this
formula
to calculate distance to open from end A or B:
d
(A or B)
D
C
Example:
If A = 240ft, B = 110ft, and D = 290ft,
then C = A + B = 240 + 110 = 350ft
distance to open from end B:
d
B
D
C
110
290
350
91.14 ft
