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3. Press
on a value to open a list box of
options.
4. Press
to confirm the value.
Continuous DC Page
The Continuous DC function measures each pair,
displaying and updating results in real time, until you
stop the test. The last valid results then remain
displayed. Significant fluctuations while this test is
running can indicate intermittent swinging, contact or
wet faults.
To view all lead combinations right away:
Press the Snapshot function key.
Continuous AC and Continuous DC are run
synchronously. Press Start/Stop on the keypad to run
the test.
Current Group is the current test group name,
for example Multimeter.
Current Test displays the test being
measured. Here you can switch to another test
from the given list. However, this action will
terminate the ongoing measurement test.
Selected Pair allows you to select All Pairs or
a single wire pair for measurement.
Termination Resistance is a read-only value
of 430 Ω that defines how much resistance the
tester uses to connect to the line.
Threshold Settings button opens a new page
that allows you to set the DC current thresholds
for each pair.
Result displays a snapshot of the pass/fail
status and DC current results for each selected
wire pair.
© 2020 Radiodetection Ltd
6100-Cu Multifunction Copper Tester Operation Manual
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.
4. Press
to confirm the value.
9.4 Resistance
The Resistance test, also known as shorts, allows you
to measure the resistance values in Ohms, of the wire
pair under test. Use this test to identify shorts and
grounds when the far end is open, comparing the
Ohms reading of each lead combination. You want
high-Ohm values between the leads when measuring
to an open, the higher the better. But if a reading is
very low, such as 200 kΩ T-G/A-E, we know there is a
ground fault present.
It is also valuable to apply a short across T/A-R/B at the
far end, and then measure the round trip loop
resistance, in which case you will see that low values
with the far-end short are applied (≤ 2500 Ω, depending
on loop length and condition). It is even more valuable
to run the resistance balance test when the far end is
shorted, as the test will calculate the resistance in
ohms of each side/leg of the pair, so you may see the
difference, in effect the balance.
Significant differences indicate one-sided faults or
series resistance and/or high resistive partial opens.
Typical values for POTS circuits are 1 to 3.5 MΩ across
each lead combination, whereas pairs for broadband
DSL should be at least 5 MΩ; and for higher speed
broadband circuits, > 20 MΩ is recommended.
Resistance values are valuable when the far end is
shorted and grounded (all leads). We can get an
accurate Ohms value for each lead/leg independent of
the other and compare them (resistance balance),
looking for a different Ohms value on one side versus
the other, indicating series or one-sided
faults/imbalances sometimes also called partial dirty or
high resistive opens. These can be difficult to locate, as
they are not clearly a ground fault, but RFL would be
the primary way to locate a one-sided series fault. In
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