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 Network Analyzers using PXI software

The calibration standards defined by data are set using the table of S-parameters. Each line of the table contains frequency and S-parameters of the calibration standard. For one-port standards the table contains the value of only one parameter — S11, and for two-port standards the table contains the values of all the four parameters — S11, S21, S12, S22.

The table of S-parameters can be filled in manually or downloaded from a file of Touchstone format. Files with *.S1P extension are used for one-port standards, and files with *.S2P extension are used for two-port standards.

The table of calibration standard S-parameters (See figure below) allows viewing and editing of S-parameters of the calibration standards of the “Data-Based” type.

Table of calibration standard S-parameters

Table of calibration standard S-parameters

Cal Kit User Kit 1

Define STD Data

To open the table of calibration standard S-parameters, move the required line in the table (See above figure), and click the following softkeys:

Define STD Data

 

 

 


note

The Define STD Data softkey is disabled if the type of the standard is other than “Data-Based”.


There are two different tables for one-port standards and for two-port standards. The table contains one parameter (S11) for one-port standards, and four parameters (S11, S21, S12, S22) for two-port standards. Before the user fills in the table, its type will be defined: by the Touchstone format (S1P or S2P) if the data is downloaded from a file, or the user will be requested to specify the type if the data is entered by the user.

The data in the table can be represented in three formats according to the user settings:

Real part and Imaginary part.

Linear magnitude and Phase (°).

Logarithmic magnitude (dB) and Phase (°).

The following rule is applied for the calibration of a two-port standard: the standard is considered connected by Port 1 (S11) to the port with smallest number and by Port 2 (S22) to the port with the biggest number. If a two-port standard needs to be reversed, use the Port Reverse function (See Port Reversing).

Adding Lines to Table

Define STD Data Thru 1

Add Row

To add a line to the table of the calibration standard S-parameters (See above figure), use the following softkeys:

Add Row

Deleting Lines from Table

Define STD Data Thru 1

Delete Row

To delete a line from the table of the calibration standard S-parameters (See above figure), use the following softkey:

Delete Row

Table Clearing

Define STD Data Thru 1

Clear Data softkey

To clear the entire table of the calibration standard S-parameters (See above figure), use the following softkey:

Clear Data

Table Format Selection

Data Format MLog_Angle

Real_Imag

Magn_Angle

MLog_Angle dot

To select the format of the table of the calibration standard S-parameters (See above figure), use the following softkey:

Format > Real/Imag | Magn/Angle | MLog/Angle

Port Reversing

Define STD Data Thru 1

Reverse Ports check

To enable/disable reversing of the ports of a two-port standard, use the following softkey:

Reverse Ports

Loading Data from File

Define STD Data Thru 1

Load Data From Touchstone File

To load the data from Touchstone file, use the following softkey:

Load Data from Touchstone file…

In the pop-up dialog select the file type (S1P or S2P) and specify the file name.

 

Rev.:  22.3