Agilent Technologies E4428C, Руководство пользователя

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112 Chapter 4
Basic Digital Operation
Using the Dual ARB Waveform Player
for the purpose of C/N, is applied across a carrier bandwidth of 40 MHz. The default noise bandwidth factor
is 1, which provides a flat noise signal bandwidth of a least 0.8 times the 50 MHz sample rate.
Storing and Loading Waveform Segments
Waveform segments can reside in volatile memory (WFM1), or they can be stored in non-volatile memory
(NVWFM), or both. However, to play or edit a waveform file, the file must reside in WFM1. Because files
stored in volatile memory do not survive a power cycle, it is a good practice to store waveform files to
non-volatile memory and load them to volatile memory whenever you want to use them.
Storing Waveform Segments to Non-Volatile Memory
Recall that there are two types of files used in the dual ARB player, segments (a single waveform file) and
sequences (a series of waveform files). A sequence is comprised of multiple segments and may include other
sequences. Refer to
“Creating a Waveform Sequence” on page 108 for more information on segments and
sequences.
The segments that compose a waveform sequence are not stored when the waveform sequence is stored. You
must save any segment or segments used to create a waveform sequence. Storing just the waveform
sequence will result in losing the waveform segments when the signal generator is turned off or rebooted
during an ESG firmware upgrade. When this occurs, you cannot play the waveform sequence until the
segments are recreated using the same file names that the sequence expects. If you attempt to play the
sequence without the segments, an error,
ERROR: 629, File format invalid will be reported, since the dual
ARB player can no longer find the waveform segments that make up the sequence.
Waveform segments must reside in volatile memory (WFM1) to be edited or played individually and all
components, such as segments and other sequences, of a sequence must reside in WFM1.
The following example demonstrates storing waveform segments. If you have not created waveform
segments, complete the steps in the previous section,
“Creating Waveform Segments” on page 107 . In this
example, the sequence is stored to the
Catalog of Seq Files
and the segments are stored to the
Catalog of NVWFM
files.
1. Press
Mode
>
Dual ARB
>
Waveform Segments
.
2. Press
Load Store
to Store.
3. Highlight the waveform segment you want to store.
4. If the waveform segment needs to be renamed, follow steps a through d, if not, proceed to step five.
a. Press
Rename Segment
>
Editing Keys
>
Clear Text
.
b. Enter a name for the waveform segment using the displayed alpha/symbol softkeys along with the
numeric keypad. The maximum length for a file name is 23 characters (alphanumeric and special
characters).