Racal Instruments 3156B, Руководство пользователя

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3156B User Manual
Racal Instrument © 2005 Using the Instrument 3-23
segment is no longer accessible. The next segment that is defined will
be placed after the last defined memory segment. However, if the last
segment is deleted, the next downloaded segment will be written on
top of the deleted one. There is danger that by using the delete
function calls too often, large portions of memory will remain unused. It
is, therefore, suggested that you periodically clear the entire memory
and only reload waveforms that you intend to use.
To delete the entire memory partition table use the following function
call:
ri3156B_delete_segment (0)
where the variable <0> defines a delete all segments command.
Tip
This function will delete the segment partition table from
the waveform however, the waveform coordinates will
remain in the destroy and therefore, if you made a mistake
and want to restore the memory segments, all you have to
do is write the memory partition table again.
Loading Arbitrary
Waveforms
The easiest way to download waveforms to the 3156B is with
WaveCAD. Using this program you can define, create and download
memory segments to the instrument without thinking about low level
commands. Regardless, it is understood that not all can use
WaveCAD and therefore, the only other way to download waveform
coordinates is by using the following function calls sequence:
First, define the work area. Define the segment number and its
associated length using the function call:
ri3156B_define_arb_segment ()
or, you can define the entire memory partition table using the following
function call:
ri3156B_load_segment_table ()
Next, make a specific segment number is made the active segment.
The active segment must be selected because as waveforms are
loaded, the Model 3156B must be notified as to where to place the
data it receives. Select the active segment using the following function
call:
ri3156B_set_active_segment ()