Two-port measurements with the tracking generator R&S FSH
1309.6275.12 4.46 E-2
increasing the dynamic range and the measurement accuracy. The operation of vector measurements
p
rimarily differs in the expanded calibration routines. In addition, the R&S FSH-K42 option offers
additional measurement functions for determining the phase, the group delay and the electrical length
of a DUT.
Press the MODE key.
Press the NETWORK ANALYZER softkey.
The R&S FSH turns on the tracking generator and
switches to its softkey menu. However, the frequency
and level settings from the spectrum analyzer mode
are not changed.
The softkey menu for the network analysis includes the softkeys for selecting measurement mode
(scalar or vector, only available in devices with VSWR bridge), calibrating the transmission
measurement (CALIBRATE TRANSMISSION FWD / REV) and reflection (CALIBRATE REFLECTION
PORT 1 / 2).Calibration is necessary because the tracking generator output level does not exactly
match the values specified in the table and it is frequency-dependent. If transmission measurements
are performed on a two-port, the calibration takes the transmission characteristics of the test setup and
the frequency response of the tracking generator into account and corrects the measurement with the
correction data that has been obtained. When a reflection measurement is to be performed, during
calibration the R&S FSH measures the reflection coefficient at a short and at an open on the bridge.
These two measurements provide the correction data for reflection measurements.
0 dB
reference
Measurement
mode
Calibration
status
Measurement
format
Selection of the
measurement mode
Selection of
calibration
routine
Selection of the
result display
Selection of the
measurement format
When the tracking generator is switched on, the status display indicates UNCAL. This indicates that
tracking generator measurements are uncalibrated. The level axis is in the relative unit dB. Apart from
the level values, the 0 dB reference is also displayed. This corresponds to a reference level of 0 dBm in
the spectrum analyzer mode (= nominal output level of the tracking generator.
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