03 | Keysight | N5430A Infiniium User-Defined Function Application for Infiniium Oscilloscopes - Data Sheet

Infiniium User-Defined Function Software

It’s easy and simple. User-defined function = XML + MATLAB script

The Keysight Infiniium user-defined function consists of two components: an XML file

and a MATLAB script file.

The XML file defines the components of the graphical user interface that appears on the

“Math” dialog box shown in the right side in Figure 3. An example XML file used to create

a user interface for a Butterworth low-pass filter is shown in Figure-1. You will define

the name of the function, abbreviation, source types, and controls in the XML file. The

Infiniium user-defined function can support up to two sources (one source, two sources,

or clock/data combination) and two controls. It also comes with a standard XML schema

if you wish to validate your XML file. (Look on public Web sites for a free XML syntax

checker that you can use in conjunction with the XML schema.)

The MATLAB script (the .m script file) will be the main program of the function, which is

developed in the MATLAB environment using MATLAB’s software tools and

programming language. Figure 2 shows an example of a Butterworth low-pass filter

shown in the MATLAB editor. The functions “butter” and “filter” available in MATLAB and

its Signal Processing Toolbox are the essential components for making this

user-definable filter.

Figure 2. MATLAB script example (shown in the MATLAB editor)

Figure 1. XML file example