Cable Measurements R&S FSH
1309.6275.12 4.66 E-2
Cable Measurements
(Only for R&S FSH8 with tracking generator (catalogue number 1309.6000.18 or 1309.6000.28) and
installed option R&S FSH-K41 (Distance-To-Fault Measurements) in conjunction with R&S FSH-Z20
(RF cable) and R&S FSH-Z28 or R&S FSH-Z29 (calibration standards).)
Measurements to determine the characteristics of cables to the antenna are key tasks when
transmission equipment is being installed or maintained. Cable damage or bad connections have an
adverse effect on the efficiency of the transmitter system. In conjunction with a tracking generator and
the option "Distance-To-Fault Measurement" (DTF, R&S FSH-K41), the R&S FSH can locate cable
faults and determine their distance from the measurement plane.
The only inputs required are the cable type and the approximate length. Using these parameters, the
R&S FSH measures the distance to any faults and the degree of mismatch. It is easy to define the
cable characteristics with the supplied "FSH4View" software package and to transfer them to the
R&S FSH. Up to 100 cable types can be stored by the R&S FSH.
The R&S FSH measures the sum of the tracking generator signal and the signal reflected by the cable
under test in the frequency domain. Depending on the phase of the signal reflected at a fault relative to
the generator signal there is either reinforcement or cancellation. Because of this effect there is ripple
on the received sum signal in the frequency domain. The R&S FSH fast Fourier transforms the received
signal to the time domain. Using the characteristic data of the cable under test, the R&S FSH directly
calculates how far the reflections have travelled from the fault. The magnitude of the fault is given by
the height of the reflection at a certain distance.
Test setup:
Connect the RF measurement cable (R&S FSH-Z20) with PORT 1 of the R&S FSH.
Calling the function:
Press the MODE key.
Press the DISTANCE TO FAULT softkey.
The R&S FSH activates the "Distance To Fault"
measurement function.
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