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990DSL
Users Guide
Running the K-Test
After performing an initial RFL test on a pair having a double-sided fault, and
whose values meet the K-Test requirements (as in Fig. 4-13), do the following:
1.
Press C(
K-Test-2W).
The tester then runs the first part of the test, performing a nulling bridge
operation on the pair with the far end open.
If one fault resistance is not greater than twice the other, an error
message is displayed at this point, and the K-Test cannot be run.
2.
If the fault ratio requirement is met, the tester prompts you to connect a
far-end T-R short. The unit may be powered down at this time, as with
other RFL options, and the test resumed (
short is connected.
3.
With the strapping prompt screen displayed, press K.
This starts the second part of the K-Test, during which the tester measures
loop resistance and performs a nulling bridge operation on the pair with
the far-end shorted.
After completion, the tester displays resistances to the fault and strap, as in
the normal RFL process.
4.
Press A (
Distance to Fault
4-34
Note
Continue Prev. Test)
) to view distances, as is normally done.
after the
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