3156B User Manual
Racal Instrument © 2005
Using the Instrument 3-37
If you do not intend to use the built in characters and want to
download to the 3156B memory your own characters, you will be
using the instrument in a similar way as you would be using the
arbitrary function, hence downloading character data to segments in
the arbitrary memory. The functions that are available for user video
stroke characters are summarized in Chapter 4.
Use the following function call to program the video stroke circulation
type:
ri3156b_set(query)_video_stroke_circ_type
()
There are two circulation modes available for video stroke: Single and
Continuous.
Single –
require trigger signals to move the video stroke
character about the screen from the start point which
is determined by the offset start value to the end point
which is determined by the offset stop value. The rate
of movement is determined by the trigger rate and the
increment of the movement is determined by the offset
step value. The character will end up at the end point
and will idle there until the function is re-selected.
Continuous – require trigger signals to move the video stroke
character about the screen from the start point which
is determined by the offset start value to the end point
which is determined by the offset stop value. The rate
of movement is determined by the trigger rate and the
increment of the movement is determined by the
offset step value then the character jumps to the start
point. The sequence is repeated continuously as long
as triggers are applied to the instrument.
The WaveCAD DIG panel can be used for selecting the video stroke
type and characters. Figure 3-10 shows an example of high level
programming using the Digital and Video Panel.