5 CALIBRATION AND CALIBRATION KIT
The scalar mixer calibration allows the following measurements:
·reflection S11 and S22 parameters in vector form;
·transmission S21 and S12 parameters in scalar form.
Before you start the calibration, perform the following settings: select active channel
and set its parameters (frequency span, IF bandwidth, etc), and define the calibration
kit. Then enable the frequency offset mode and perform the port settings.
Note The scalar mixer calibration can be performed without
frequency offset. You can enable the frequency offset
mode later, during mixer measurements. In this case the
basic frequency range should cover the frequency spans of
the ports in offset mode. This procedure is convenient but
less accurate as involves interpolation.
To access the scalar mixer calibration menu, use the
Calibration > Mixer/Converter Calibration > Scalar Mixer
Click Reflection Port 1 softkey.
Connect SHORT, OPEN and LOAD standards to port 1 as
shown in figure 5.20. Perform two measurements over two
frequency ranges (Freq 1 and Freq 2) for each standard
using the respective standard softkeys.
If the frequency offset is disabled, after measurement over
one frequency range the result will be automatically saved
for the both frequency ranges.
The instrument status bar will indicate Calibration in
progress... when the measurement is in progress. On
completion of the measurement, a check mark will appear
in the left part of the softkey.