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 Network Analyzers using PXI software

The port extension function moves the calibration plane toward the DUT terminals by the specified electrical delay value. The function is useful when a fixture is used for the DUT connecting and the calibration cannot be performed at the DUT terminals. The calibration plane can be established at coaxial connectors of the fixture and then moved to the DUT terminals using the port extension function (See figure below).

Port extension

Port extension

The function uses the model of the perfectly matched transmission line with loss with parameters:

The phase incursion in the line is

,

where - frequency, Hz,

- electrical delay, sec.

The loss of the line can be specified by one of the following methods:

1.Frequency-independent loss at DC ()

.

2. Loss determined by the losses in two frequency points ( at DC, and at frequency )

3. Loss determined by the losses in three frequency points ( at DC, at frequency and at frequency )

,

.


note

The accuracy of the port extension method depends on the fixture used. The closer the fixture parameters are to the model of a perfectly matched transmission line, the higher the accuracy.


Port extensions softkey

Extensions OFF

To enable the port extension function, use the following softkeys:

Calibration > Port Extensions > Extensions [ ON|OFF]

 

Extension Port 1

To set the electrical delay for each port, use the following softkeys:

Extension Port1 or Extension Port2

 

Loss

To open the menu of the losses, use the following softkeys:

Calibration > Port Extensions >Loss

Select port

To select the port in menu, use softkey:

Select Port

Loss1 ON

Loss1 -1dB

Freq1 1 GHz

Enter the , values and enable the use of these values in further calculations, use the following softkeys:

Loss1 [ ON | OFF ]

Loss1

Freq1

Perform the same steps for , .

Loss at DC 0 dB

Enter the value, use the following softkey:

Loss at DC

 

 

 

 

Rev.:  22.3