6-20 ES User’s Guide
Calibrating for Increased Measurement Accuracy
Calibration Choices
Restoring the default two-port calibration recalls error correction arrays
that were calculated at the factory or during servicing and then
permanently stored in memory. This two-port calibration was performed
using full band (entire frequency span) and 401 frequency points, and
corrects systematic errors caused by frequency response, load match,
source match, and directivity. It is quick and convenient but not as
accurate at narrow frequency spans. The calibration reference planes are
at the analyzer’s port 1 and port 2, so if you use cables in your test setup
you should adjust the port extensions to match the electrical lengths of
the cables (see “Port Extensions” on page 5-18). Best accuracy would be
achieved by performing a user-defined two-port calibration. When using
the default 2-port calibration to measure the cable supplied with the
analyzer, the measured delay is approximately 3 ns. When a two-port
calibration is selected, the analyzer automatically measures all four
S-parameters. To quickly view each of the four S-parameters, press
, and then press the desired S-parameter
softkeys under the or menu. You may need to
adjust the scaling to view each of the S-parameters.
NOTE When toggled on, the softkey allows you to remove
systematic errors caused by crosstalk. To select it, press
. A two-port
calibration always measures the same parameters, regardless of the
setting of . Therefore, no further measurements of
calibration standards are required when you enable the isolation
calibration feature. When toggled ON, this feature will change the
analyzer’s calculations before displaying the data. Crosstalk can be a
problem with high-isolation devices and high-dynamic range devices.
Since this isolation calibration adds noise to the error model, you should
only select it if it is really needed.
MENU
MEAS 1 MEAS 2
CAL
To Next Page
Loading...
Need help?
General
