R&S FSH
Network Analyzer Mode
Calibrating Measurements
Operating Manual 1173.6275.12 - 30
183
6.2.1.2 Calibration Methods
The available calibration methods depend on whether you perform scalar or vector
measurements. In addition, calibration for reflection measurements is available only for
models with an VSWR bridge.
Scalar measurements
Scalar measurements provide normalization of transmission and reflection only.
Normalization is a simple but effective way to calibrate the measurement using one
calibration standard only. The correction data is deducted from this measurement. As
only one calibration standard is used, the accuracy is lower than that of a full
calibration available for vector measurements.
Vector measurements
Vector measurements provide several calibration methods that correct the magnitude
and the phase.
● Full 2-Port
Both test ports are calibrated for both reflection and transmission measurements
on either port or direction. 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.
● Full 2-Port High Accuracy
Both test ports are calibrated like the full 2-port calibration. In addition, the load
match is taken into account more accurately and correction data is applied in both
directions, forward and reverse.
This method provides even more accurate results than the normal full 2-port
calibration but takes a while longer to finish.
● Reflection Port 1/2
Test port 1 or 2 is calibrated for reflection measurements on that port (S11 or S22).
The calibration routine requires the calibration standards open, short and load to
be connected one after another.
● Transmission Fwd (Port 1
2) and Transmission Rev (Port 2
1)
Test port 1 or 2 is calibrated for transmission measurements (S12 or S21). For
measurements in forward direction, this method calibrates port 1, in case of
measurements in the reverse direction, it calibrates port 2.
The calibration requires a through connection and the calibration standards open
and short.
