R&S FSH3 Setting and Using the Measurement Functions
Vector measurement of reflection
(only available with option R&S FSH-K2)
Unlike with scalar measurement, the R&S FSH3 corrects the waveform reflected by the DUT according
to magnitude and
phase by means of the correction values obtained from calibration. In addition to
calibration with open circuit and short circuit, calibration with a 50 Ω termination is necessary. Thus, the
characteristics of the VSWR bridge (directivity and impedances) no longer affect the measurement
result. Rather, the decisive factor is the quality of the calibration parameters open circuit, short circuit
and 50 Ω termination.
Vector measurement therefore yields higher dynamic range and thus accuracy.
With vector measurements, the R&S FSH3 sets the bandwidths (Res BW and Video BW) to a fixed,
unchangeable value. It invariably uses the sample detector as a detector. All other measurement
parameters can be set as with scalar measurement.
Calibration:
¾ Press the REFLECT VECT CAL softkey.
The R&S FSH3 displays a message requesting
termination of the measurement input into an open
circuit (Open).
¾ Terminate the measurement input of the VSWR
bridge or the end of the measurement cable into
an open circuit.
¾ Start open-circuit calibration by pressing the first or
the second softkey (CONTINUE). During
calibration, the R&S FSH3 outputs the message
"Calibrating OPEN, please wait...".
¾ Calibration can be aborted at any stage with the
CANCEL softkey.
When the open-circuit calibration is over, the
R&S FSH3 outputs a message requesting the
termination of the measurement port into a short
circuit.
¾ Terminate the measurement input of the bridge or
the end of the measurement cable into a short
circuit.
¾ Start the short-circuit calibration by pressing the
first or the second softkey (CONTINUE). During
calibration, the R&S FSH3 outputs the message
"Calibrating SHORT, please wait...".
1145.5973.12 4.63 E-6
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