Radiodetection 6100-Gfast, Руководство по эксплуатации

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6100-Gfast Multifunction Network Analyzer Operation Manual
64 © 2020 Radiodetection Ltd
an entry (with its associated
parameters) from the current Cable
Book, to use for testing. The selection
is not saved when leaving the test. The
current Cable Book entry is shown by
default.
o
Cable Temperature is the temperature
in either °F or °C of the cable under
test.

Resistance displays the resistance per length
value of the selected Cable Type . The value is
updated when Cable Temperature/Type
change.

Threshold Settings button opens a new page
that allows you to set the resistance thresholds
for each pair.

Result displays a snapshot of the pass/fail
status, Continuous Resistance and Length
for each selected wire pair.

Test Status displays the current state of
measurement or an error message.
To select the parameter values:
1. Press the up/down arrow keys to highlight the
desired parameter.
2. Press the left/right arrow keys to view and
select the options.
OR
3. Press on a value to open a list box of
options or the alphanumeric editor screen and
use the navigation keys to scroll through.
4. Press to confirm the value.
9.5 Resistive Balance
The Resistive Balance test measures and compares
the resistance of each leg. This test requires you to
short Tip and Ring (T-R/A-B) to ground/earth at the far
end (T-R-G/A-B-E short) before proceeding with the
test. Teletech's TS-125 FED (Far End Device) can
automatically set the far end condition.
Snapshot
The Resistive Balance test is valuable in
understanding the presence of resistive faults on one
side versus the other (series resistance). A 5 %
difference in the Ohms value between T/A and R/B is
common (95 % balance), but for higher speed DSL
such as VDSL2, imbalance is more critical and should
be 2-3 % when possible (97-98 % balance). There will
be low-Ohm values when measuring resistance with a
short at the far end.
For example, on 24 AWG cable at 21 °C (70 °F), you
will see 520
Ω for a 3 m (10 ft) cable. If both Tip and
Ring have 520
Ω, the pair is balanced perfectly, but
there will normally be some small difference and a
much larger value on one side, for example, 800
Ω
indicates a significant series fault on that side.
The resistive balance
Snapshot shows results for R/B-
Leg , T/A-Leg , Loop resistance, and the pass/fail
status for Resistive Balance in
Ω and %.
Parameters are as follows:

Current Group is the current test group name,
for example Multimeter .

Current Test displays the test being
measured. When FED is Enabled , the FED
icon and numeric state are displayed beside
the
Current Test . Here you can switch to
another test from the given list. However, this
action will terminate the ongoing measurement
test

Threshold Settings button opens a new page
that allows you to set the resistive balance
thresholds.

Test Status displays the current state of
measurement or an error message.
To select the parameter values:
1. Press the up/down arrow keys to highlight the
desired parameter.