R&S FSH Two-port measurements with the tracking generator
1309.6275.12 4.51 E-2
1. Full Two Port:
Both test ports are calibrated for a complete set of measurements (input reflection (S11),
forward transmission (S21), reverse transmission (S12) and output reflection (S22). The
calibration routine therefore requires the connection of the standards load, open and short to
both test ports, and a through connection of the test ports. The influences of the test setup and
of the isolation between the test ports are thereby determined and taken into account in the
subsequent measurement of the device under test.
While this method is the most time-consuming during calibration, it does provide the greatest
accuracy for all measurements at both test ports without recalibration and is thus the most
flexible.
Note:
The instrument is delivered with a full two port calibration (factory calibration). This does not,
however, take into account the influence of the actual test setup (cabling). Thus all
measurements are possible, even without further calibration, however, the accuracy is limited
because the actual test setup is not taken into account. For this reason, the instrument
indicates "(Uncal)" in the status line. To achieve the best possible measuring accuracy, we
recommend that the calibration is repeated with the test setup in use.
2. Reflection Port 1:
Test port 1 is calibrated for the reflection measurement (S11). The calibration routine requires
the calibration standards open, short and load to be connected one after another.
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
calibration. 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.
3. Transmission Fwd (Port 1 -> 2):
Forward transmission (S21) is calibrated. The calibration routine requires a through connection
as well as the connection of the calibration standards open and short to Port 1. The influences
of test setup and the isolation between the test ports are thereby determined and taken into
account in the subsequent measurement of the device under test.
Note:
The instrument is delivered with a full two port calibration (factory calibration). If, after
calibration of the forward transmission, other measurements (Transmission Rev, Reflection Port
1 / Port 2) are selected, the R&S FSH uses the appropriate calibration data from the factory
calibration. 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.
4. Transmission Rev (Port 2 -> 1):
Reverse transmission (S12) is calibrated. The calibration routine requires a through connection
as well as the connection of the calibration standards open and short to Port 2. The influences
of the test setup and of the isolation between the test ports are thereby determined and taken
into account in the subsequent measurement of the device under test.
Note:
The instrument is delivered with a full two port calibration (factory calibration). If, after
calibration of the forward transmission, other measurements (Transmission Rev, Reflection Port
1 / Port 2) are selected, the R&S FSH uses the appropriate calibration data from the factory
calibration. 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.
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