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12 Loop resistance measurement (R)
ARGUS Copper Box
65
Example measurements:
The example shows a measurement of
458 Ω. For a copper cable with a specific
resistance of 160 Ω / km, this indicates a
short-circuited twisted pair with a length
of 1.43 km.
As an explanation, the line can be
deliberately shorted at one end, or is
unintentionally shorted due to a fault in an
unknown location.
A large value such as 20 MΩ or >40 MΩ
indicates that no line loop (intentional
shorting) has been set up.
Loop resistance cannot be measured
then.
12.1 Calculating line length
See page 49 for calculation of line length using the R-values.