Two-port measurements with the tracking generator R&S FSH
1309.6275.12 4.52 E-2
5. Reflection Port 2:
T
est port 2 is calibrated for the reflection measurement (S22). The calibration routine requires
the calibration standards open, short and load.
Note:
The instrument is delivered with a full two port calibration (factory calibration). If, after
calibration of the reflection at port 1, other measurements (Transmission Fwd / Rev, Reflection
Port 2) are selected, the R&S FSH uses the appropriate calibration data from the factory
c
alibration. The measurements are thus possible but only with limited accuracy because the
test setup in use is not taken into account. For this reason, the instrument indicates "(Uncal)" in
the status line.
6. Normalize Reflection Port 1 (Short):
Test port 1 is calibrated for the reflection measurement (S11). The calibration routine requires
only the calibration standard short. In the subsequent measurement, the isolation between the
test ports is not taken into account, a possible cross-talk between the test ports in the test setup
is not eliminated.
Note:
For the selection of other measurements, the same applies as for Reflection Port 1.
7. Normalize Reflection Port 2 (Short):
Test port 2 is calibrated for the reflection measurement (S22). The calibration routine requires
only the calibration standard short. In the subsequent measurement, the isolation between the
test ports is not taken into account, a possible cross-talk between the test ports in the test setup
is not eliminated.
Note:
For the selection of other measurements, the same applies as for Reflection Port 2.
Vector transmission measurement
Switching on vector measurement:
Press the MODE key.
Press the NETWORK ANALYZER softkey.
Select VECTOR from the MEAS MODE menu using
the cursor keys or the rotary knob.
Confirm your choice with the ENTER key or the
MEAS MODE softkey.
Calibrating the measurement:
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 measurement must be recalibrated.
Note: The calibration remains valid if the start frequency, stop frequency, center frequency and span
are subsequently changed within the calibrated frequency range. In this case, the R&S FSH
interpolates the correction data between the reference points of the calibration. The R&S FSH retains
the calibration values but indicates a possible increase in measurement uncertainty by displaying
(APPROX) in the upper area of the screen..
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