R&S FSH
Getting Started
Identifying Cable Faults
Quick Start Guide 1309.6269.12 - 09
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You can also define new cable models on the R&S FSH or with the R&S FSH4View
software and then transfer them to the R&S FSH. For more information see the
operating manual.
In addition to the cable model, you should also specify the length of the cable.
► Press the "Cable Config" softkey.
► Select the "Cable Length" item.
The R&S FSH opens an input field to specify the cable length. The range is from
3 m (10 ft) to 1500 m (4921 ft).
► Enter the cable length.
The unit depends on the regional settings. It is either meter or feet. For more
information see "
Attributes" on page 40.
The R&S FSH uses the cable length to determine the ideal span for the measurement
and to scale the horizontal axis. For best results, the cable should be specified 20% to
50% longer than the actual cable length.
Calibrating the test setup
Before connecting the cable, you should calibrate the R&S FSH to get the best
measurement results.
► Press the MEAS key.
► Press the "Calibration" softkey.
► Select the "Calibrate" menu item.
The R&S FSH asks you to connect a "Short", an "Open" and a "Load" to the
measurement cable.
► Firmly connect the short, the open and the load to the output end of the cable.
► After each step, proceed with the "Continue" softkey.
After the calibration, the R&S FSH shows that it is calibrated by displaying (CAL).
► Screw the cable under test back to the measurement cable.
In DTF mode, the R&S FSH performs calibration over its entire span. Therefore, <ou
do not have to perform a new calibration after changing the frequency range or cable
length.
The R&S FSH stores the calibration data in its memory. Thus, the calibration is valid
after you change the operating mode or after you turn off the R&S FSH.
The R&S FSH now shows the cable characteristics over the cable's entire length. With
a marker, you can easily detect the distance to the cable fault.
