Chapter 3 - Startup
232 - V 3.11.4
7
FOULT LOCATION
-
Position the cursor on the start of the pulse and read the length
of the cable.
-
If a fault-free cable is terminated with a resistance identical to
the wave resistance of the cable, no reflection is observed.
-
If there are interruptions, contact defects on joints, pinches,
shorts or branches/splitters in the region investigated, the
length to the beginning of the cable can be determined from the
pulse echos.
If a wide output pulse is used for measurement, the pulse
echos are more pronounced. Defective branches and splitters
then produce stronger pulse echos.
SHORTENING FACTOR
Coaxial cable with PE dielektric
0.66
Coaxial cable with foam PE
0.82
(0.78 – 0.95)
Stripline with foam insulation
0.83
Coaxial cable with air insulation
0.9
(0.88 – 0.92)
Electric cable
0.49 – 0.57 (ca. 0.53)
Attention!
The shortening factor is stored by simultaneous pressing of the keys 1 and 3.
When storing the shortening factor the factor must be indicated inverted on the display.
Do not measure on live lines. Voltage strength max. 65 Vdc..
