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 Network Analyzers using PXI software

Along with defining a calibration standard by a calibration model or data, the standard should also be assigned a specific class. One calibration standard may belong to several classes. The class assignment is performed for each particular calibration kit.

Class assignment to a calibration standard is required for specifying such properties as the calibration method, the role of a standard in the calibration, and the number of the port(s). The Analyzer supports the following classes of the calibration standards (See table below).

Calibration Methods

Class Label

Port

Full Two-Port Calibration

Full One-Port Calibration

One-Path Two-Port Calibration

Transmission Normalization

Reflection Normalization

OPEN

1

2

SHORT

1

2

LOAD

1

2

THRU

1-2

TRL Calibration

TRL THRU

1-2

LRL Calibration

TRL REFLECT

1

TRM Calibration

2

LRM Calibration

TRL LINE/MATCH

1-2

For example, if the class "OPEN of Port 1" is assigned to the OPEN -F- calibration standard, it will indicate that this standard is used for calibrating the first port using the following calibration methods: full two-port, full one-port, one-path two-port, and normalization.


note

The class assignment changes the labels of the calibration standards on the calibration softkeys.


The assignment of classes to the standards of the selected calibration kit is made in the table of standard classes (See figure below).

Table of calibration standard classes

Table of calibration standard classes

Standard labels populate the table cells by selecting them from the list of calibration kit standards.

Each row of the table corresponds to the standard class specified in the two left columns of the table.

If a single standard is assigned to the class, then it filled into the "Subclass 1" column. If several standards are assigned to the class then "Subclass 2", “Subclass 3”, etc. columns are filled in.


note

When assigning two or more subclasses to one class of calibration standards the calibration menu changes: the standard measurement softkey is replaced by the softkey, which opens the subclass menu containing the list of all the standards of this class.


Using one subclass is appropriate in cases when it is known which standard and of which polarity, male or female, is assigned to each port, or when the mathematical models of male and female standards are the same. Using of one subclass simplifies the calibration menu structure.

Using more than one subclass allows to:

Postpone the selection of standards of the same class available in the calibration kit to the calibration stage. It is possible to select between male and female standards, FLUSH THRU and UNKNOWN THRU.

Perform the band split calibration as described in Bandsplit Calibration Using Subclasses.

Cal Kit 8850Q grey

Specify CLSs

To open the table of calibration standard classes, use the following softkeys:

Calibration > Cal Kit > Specify CLSs

Standard Class Table Editing

Moving in the table of calibration standard classes (See above figure) using navigation keys, click «Enter» in the required cell for the pop-up menu. Select the standard label in the pop-up menu to assign it the class and port number specified in the left part of the table.  

Deleting Standards from the Standard Class Table

Moving in the table of calibration standard classes (See above figure) using navigation keys, click «Enter» in the required cell for the pop-up menu. Select the line None in the pop-up menu to delete the standard contained in the cell.

Specify Classes 85054B

Clear All CLSs

To delete all the standards in the table of calibration standard classes, use the following softkey:

Clear All CLSs

 

Rev.:  22.3