R&S FSH
Network Analyzer Mode
Performing Vector Measurements (R&S FSH-K42)
Operating Manual 1173.6275.12 - 30
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6.4 Performing Vector Measurements (R&S FSH-K42)
If you equip the R&S FSH with option R&S FSH-K42, vector measurements become
available. The R&S FSH also must feature an VSWR bridge in addition to the tracking
generator.
Unlike scalar measurements, vector measurements also measure the phase
characteristics of a DUT. Vector measurements also have a higher dynamic range and
accuracy because of the advanced calibration methods that vector measurements
provide.
In addition to normalization, vector measurements feature full calibration methods that
require a 50
Ω termination in addition to an open or short circuit. Instead of the
characteristics of the VSWR bridge, the decisive factor of the quality of results is the
quality of the calibration standards.
Because of the higher dynamic range, vector measurements allow more accurate
measurements of well matched DUTs at a higher display resolution.
Vector measurements also unlock more measurement formats and therefore provide
more information from different perspectives about the DUT.
Supplying DC voltage to active DUTs
If you are performing measurements on active DUTs (e.g. amplifiers), you can supply
them with DC voltage by connecting an RF cable to the BIAS ports. The DC voltage is
fed in from a suitable external power supply (max. 600 mA/max. 50 V).
To measure the antenna coupling of mobile radio base stations, the DC voltage must
be supplied to two tower-mounted amplifiers (TMA). This is done by applying a
suitable voltage at the BIAS 1 and BIAS 2 BNC ports.
