Two-port measurements with the tracking generator R&S FSH
1309.6275.12 4.58 E-2
Vector measurement of reflection
(only available for models with integrated VSWR bridge (order numbers 1309.6000.24 or 1309.6000.28)
and equipped with with option R&S FSH-K42 in conjunction with option R&S FSH-Z28 and R&S FSH-
Z29).
Unlike with scalar measurement, the R&S FSH 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 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 termination. Vector measurement therefore yields higher dynamic range and thus accuracy.
Due to the higher dynamic range, the display ranges for the VSWR and VSWR 1 –1.5 and VSWR 1 –
1.1 have been expanded. As a result, extremely well matched DUTs can be measured more accurately
and at a higher display resolution. However, a major advantage of the vector measurement is the
capability to display the complex test results in a Smith chart. This allows for a much more detailed look
at the DUT characteristics than with the reflection magnitude display as return loss, reflection coefficient
or VSWR. Moreover, the vector reflection measurement allows you to determine the phase, the group
delay and the electrical length of a DUT. The specified measurements become available only after
calibration has been performed. With vector measurements, the R&S FSH 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.
Switching on vector measurement:
Press the MEAS MODE softkey.
Select VECTOR from the menu using the cursor
keys or the rotary knob.
Confirm your choice with the ENTER key or the
MEAS MODE softkey.
Calibration:
Before the R&S FSH is calibrated, the desired center frequency and span must be set. If they are set
later, the calibration values are lost and the calibration must be repeated.
Press the CALIBRATE softkey.
Select REFLECTION PORT 1 using the rotary
knob or the cursor keys and confirm by pressing
the CALIBRATE softkey.
The R&S FSH
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