Setting and Using the Measurement Functions R&S FSH3
Calling the function:
¾ Press the MEAS key.
¾ Press the MEASURE softkey.
The measurement function submenu opens.
¾ Using the cursor keys or the rotary knob, select the
DISTANCE TO FAULT menu item and confirm
your selection with the ENTER key or the MEAS
softkey.
The R&S FSH3 turns on the "Distance To Fault"
measurement function.
Cable type
DTF status
Cable length
Softkey menu for
DTF measurements
To perform distance-to-fault cable measurements, the R&S FSH3 needs to “know” the type of cable and
its approximate length.
The cable type must be known to determine the speed of propagation and so the distance to any fault
along the cable. The attenuation of the cable must be known to determine the size of the fault correctly.
The R&S FSH3 automatically sets the span according to the approximate length of the cable.
Cable selection:
Frequency-dependent cable models can be generated with the supplied R&S FSH View Windows
software package and loaded into the R&S FSH3. The procedure is described in the R&S FSH View
manual. The R&S FSH3 can store up to fifteen different cable types in its internal memory.
Frequency-dependent cable models can also be defined directly on the R&S FSH3 in the corresponding
menu. In this way, cable models not generated with R&S FSH View can be added.
If the distance to a cable fault is to be located precisely, it is essential to use the appropriate cable
model. If not, the R&S FSH3 will not be able to correctly determine the distance of the fault from the
measurement plane and the magnitude of the reflection at the fault.
1145.5973.12 4.66 E-6
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