S820E UG PN: 10580-00343 Rev. H 3-19
Cable and Antenna Measurements 3-5 Distance-To-Fault (DTF)
Example 1 – DTF with a Short to Measure Cable Length
To measure the length of a cable, DTF measurements can be made with an
open or a short connected at the end of the cable. The peak indicating the end
of the cable should be between 0 dB and 5 dB. In Figure 3-9 on page 3-19 the
cable end is at 15 meters.
The cable end was found by selecting Marker 3
(Marker > Select M(1-8) > M3) then using searching for the trace peak (Marker
> Marker Search > Marker to Peak).
Figure 3-9. DTF Return Loss with Short at End of Cable (15 m)
Note
In Figure 3-9, M1 and M2 are jumper cable connections. The
peak beyond the end of the cable at M3 is the return reflection of
the M2 peak.
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