R&S FSH
Distance-to-Fault Mode (R&S FSH-K41)
Configuring Cable and Antenna Tests
Operating Manual 1309.6275.12 - 14
155
5.1.5 Calibrating Measurements
You will need one of the available calibration standards R&S FSH-Z28, -Z29 (order no.
1300.7804.03 and 1300.7504.03) or R&S ZV-Z121 (order no. 1164.0496.02/.03).
To successfully calibrate the test setup, you have to connect the calibration standard at
the reference plane, usually the output of the RF measurement cable.
Calibration is performed over the R&S FSH's entire frequency range. This eliminates
the need for recalibration when you change a parameter or select a different cable or
DUT.
Calibration also remains valid after turning off the R&S FSH or changing into another
operating mode as calibration data is saved in the internal memory of the R&S FSH.
5.1.5.1 Calibration States
The calibration states are the same as for the network analyzer. For more information
see "
5.1.5.2 Calibration Methods
In distance-to-fault mode, the calibration method is a full 1-port calibration. For more
information see "
5.1.5.3 Performing a Full 2-Port Calibration
For a description of a complete calibration procedure see "
" on
page 127
5.2 Configuring Cable and Antenna Tests
For valid measurement results, you need to specify the characteristics of the cable
under test like model or frequency range.
5.2.1 Selecting the Cable Model
To determine the speed of propagation, and therefore the precise distance to any
faults, you have to specify the cable model that you want to test.
The R&S FSH already comes with an assortment of predefined cable models that you
can use without doing anything. If you want to test a cable that is not listed, you can
also define cable models manually, either directly on the R&S FSH or with the "Cable
Model Editor" of the R&S FSH4View software package that is delivered with the
R&S FSH.
