VF / DSL Cable Qualifier
120
The Longitudinal Balance Test Setup menu has several options that appear at the upper part of the screen
(see the previous illustration). The parameters can be modified to customize a Longitudinal Balance test.
The Longitudinal Balance test setup options are described as follows:
TEST TYPE:
LONG BAL NEAR END
. This test is a single ended longitudinal balance test
where the resultant is plotted from 26 kHz to 2208 kHz.
TERM
IMPEDANCE:
The options are 100 ohms, 135 ohms, and AUTO (older hardware will still show
120 and 150 ohms). For single-ended tests, the AUTO impedance setting is
recommended because it gives better accuracy by measuring the cable and
selecting the most appropriate attenuation.
8.5.2 Running a Longitudinal Balance Test
Use caution when connecting the test set, as telephone cables may have dangerous A.C. or D.C.
voltages on them. The CableSHARK will not run a Longitudinal Balance if the voltage on the line
is greater than 10 volts.
Press the RUN / STOP button on the front of the CableSHARK to initiate the test. Figure 8.5.2A shows an
example of the results obtained from a Longitudinal Balance Test.
Summary of Contents for CableSHARK P3
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