Fluke 990DSL, Руководство пользователя

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POTS Testing and Fault Location
The POTS Toolbox
4
4-29
Deleting or Inserting a Wire Gauge Entry
To delete the information in a complete Section number line, select the desired
section using
F
or
H
, then press
C
(
Delete Section
).
To insert a section, position the cursor to the section above which you want to
add a line, and press
B
(
Insert Section
).
RFL Test “Distance to Strap” Entry
If the distance to the strap was known and entered into Section 1 of the above
Multiple Gauge entry screen (along with
Y
in the
Strap Dist.
field), all other
section data will be ignored . The RFL fault distances will then be based on a
wire resistivity that is calculated from the entered strap distance.
Note
If the cable contains one or more gauge changes between the tester
and the far-end strap, the average resistivity calculated from the
entered strap distance could result in inaccurate distance-to-fault or
fault-to-strap readings, depending on the relative lengths of the
different gauges.
Short or Double-Sided Fault Location (3 Wire) Test Results
To view test results for a short or double-sided fault, select the desired
strapping option to complete the bridge (as prompted in Figure 4-13).
Note
If the fault is a short or if both conductors are faulted, you must use
either a good conductor or pair to complete one leg of the bridge. It is
best to use a separate good pair for the leg because it can be
any
length or gauge . If only one good conductor is available, it can work
as well, but it must be the same length and gauge as the faulted pair.