Agilent Technologies ESG Guia do Utilizador descarregar pdf (Página 90)

74 Chapter 3

Basic Digital Operation

Arbitrary (ARB) Waveform Header Files

5. Press the View Header softkey.

The header file for the selected waveform file is now showing in the ESG display. If there was

a waveform playing, its header information is removed from the ESG display, but its settings

are still being applied to the signal generator. There are two ways to return the header

information for the playing waveform. One way is to press the

View Different Header, select the

current playing waveform file, and press

View Header. The second way is to press Return and

then

Header Utilities.

Storing a Header File

A header file is stored when the generated waveform file (AUTOGEN_WAVEFORM) or a

downloaded file is stored using the dual ARB player. In the dual ARB player, the waveform is

referred to as a waveform segment, so the operations that involve storing the waveform file

are found by pressing the

Waveform Segment softkey.

There are two memory types where a waveform file can exist, volatile and non-volatile

memory. When a waveform is created on the ESG, it already exists in volatile memory.

However you may want to change the waveform file name to prevent it from being overwritten

by another waveform file generation, since all ARB modulation formats use the same file

name (AUTOGEN_WAVEFORM). When downloading a file, it can be loaded into volatile or

non-volatile memory.

Follow the procedure “Storing Waveform Segments to Non-Volatile Memory” on page 82 to

store a header file.

Follow the procedure “Creating the First Waveform Segment” on page 78 to rename a

waveform (segment) file.

Playing a Waveform File containing a Header

After a waveform file (AUTOGEN_WAVEFORM) has been generated in a modulation format

and the format is turned off, it becomes accessible to and played back only in the dual ARB

player. This is also true for downloaded waveform files. This is when the saved header

information is utilized in setting the signal generator parameters. The header file settings are

applied to the signal generator when the waveform is selected for play-back. Some of these

settings will appear as part of the softkey labels, surround by parenthesis, for the softkeys

that are used to set the parameters that are saved in the header file. In addition, some of the

saved header settings also appear on the dual ARB summary display. This is demonstrated in

Figure 3-10.

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