Measuring Opens - Viavi OneExpert DSL User Manual

Measuring resistive balance
This feature allows the user to test and compare the resistance of each lead used as a pair
with ground as the reference. The result can be used to determine if there are any bad splices.
Resistive Balance requires the VIAVI UltraFED or a manual strap to ground at the far end.
1. Connect the Tip (A), Ring (B), and Ground (Earth) leads to the line under test.
2. From the Copper menu, select the Multimeter button.
3. Press the Ω (Omega) tab. The Resistance screen appears.
4. Select Options and then select Resistive Balance. The Resistive Balance menu appears.
5. Do one of the following:
Manually strap Tip (A), Ring (B), and Ground (Earth) leads at the far end of the
y
line under test and select the Manual Strap option
Connect an UltraFED to the Tip (A), Ring (B), and Ground (Earth) leads at the far
y
end of the line under test and select the UFED option
6. Press the Start softkey to run the measurement.

Measuring opens

This feature measures the total electrical (capacitive) length of a pair.
1. Connect the Tip (A), Ring (B), and Ground (Earth) leads to the line under test.
2. From the Copper menu, select the Opens button. You can also access the Opens feature
from the Multimeter screen as part of the MultiMeter test suite by pressing the Opens
tab.
DC and AC Volts and impedance results are listed for each test (these values are
available on the 580P instrument only).
3. To change the cable capacitance, press the Options button
and then do one of the following:
Select a standard cable capacitance.
y
Select Custom Cable to specify a custom capacitance:
y
The custom cable menu appears.
- Enter a name.
- Specify a value for the mutual conversion factor
- Specify a value for the ground capacitance, in
May 2020
in μF/mile (or other units depending on your
configuration). This value is used for Tip-to-Ring
(or A-B) capacitance.
OneExpert DSL User's Guide
22052280, Rev. 016
Chapter 4 Copper Testing
91