User`s guide

74 Chapter 3
Basic Digital Operation
Arbitrary (ARB) Waveform File Headers
the active modulation, you must modify the default settings before you save the header
information with the waveform file (see “Modifying Header Information in a Modulation Format”
on page 74).
NOTE Each time an ARB modulation format is turned on, a new temporary waveform file
(AUTOGEN_WAVEFORM) and file header are generated, overwriting the previous temporary
file and file header. Because all ARB formats use the same file name, this happens even if
the previous AUTOGEN_WAVEFORM file was created by a different ARB modulation format.
Modifying Header Information in a Modulation Format
This procedure builds on the previous procedure, explaining the different areas of a file header, and
showing how to access, modify, and save changes to the information.
In a modulation format, you can access a file header only while the modulation format is active (on).
This procedure uses the Custom digital modulation format. All ARB modulation formats and the dual
ARB player access the file header the same way, except that in some modulation formats, you may
have to go to page two of the first-level softkey menu.
1. From the first- level softkey menu (shown in Figure 3- 1 on page 73), open the Header Utilities
menu:
Press
ARB Setup > Header Utilities
Figure 3-2 shows the default header for the Custom digital modulation waveform. The
Saved Header Settings column, shows that the signal generator settings for the active format
are Unspecified, which means that no settings have been saved to the file header.
NOTE If a setting is unspecified in the file header, the signal generator’s current value for that
setting does not change when you select and play the waveform in the future.
The Current Inst. Settings column shows the current signal generator settings for the active
modulation. These settings become the saved header settings when they are saved to the file
header (as demonstrated in Step 2).