Agilent Technologies ESG Guia do Utilizador Página 78

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62 Chapter 3
Basic Digital Operation
Arbitrary (ARB) Waveform Header Files
Arbitrary (ARB) Waveform Header Files
Headers are files that contain ARB waveform signal generator settings along with an area
where a 32-character description can be entered. Saving information to the header lets you
optimize the waveform and replicate it for play-back in the dual ARB player. The settings
within the header file can be modified and stored into non-volatile memory. A default header
file is automatically created whenever a waveform is generated, a waveform sequence is
created, or a waveform file is created externally to the ESG and downloaded.
The header file settings are applied to the signal generator when the waveform is selected for
play-back in the dual ARB player. The following list shows the signal generator settings that
are saved in the header file:
ARB sample clock rate
Runtime scaling (only in the dual ARB player)
Marker polarity (markers 1 through 4)
Marker routing functions (markers 1 through 4)
—ALC hold
Alternate amplitude
RF blanking
Modulator attenuation
Modulator filter
I/Q output filter (used when routing signals to the rear panel I/Q outputs)
The header file is stored when the waveform file is stored using the dual ARB player. So when
a waveform file is selected for play-back, your header file settings are applied to the ESG.
Generating a Header File for a Modulation Format Waveform
A default header file is automatically created when the waveform file
(AUTOGEN_WAVEFORM) is generated. The ESG generates the waveform file when a
modulation format is turned on. The default header has no signal generator settings saved to
it and uses the current modulation format parameters.
For this procedure, we will generate a header file using the ARB cdma2000 modulation
format. This procedure is the same for all ARB formats.
1. Press
Preset.
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