Stanford Research Systems SR780, Operating Manual And Programming Reference

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Waterfall Menu 4-123
SR780 Network Signal Analyzer
Waterfall displays show multiple measurement results (records) in a single display. New
records are added at the top of the display and older records scroll off the bottom of the
display. When the Scroll Angle is 0, the older records scroll straight down. When the
Scroll Angle is negative, the older records shift left as they scroll down. When the Scroll
Angle is positive, they shift right as they scroll down.
The View Count and the Trace Height determine the available scroll angles. When Fast
Angles is On, the available scroll angles are limited to those which scroll faster (due to
the graphics architecture). This menu box sets the requested scroll angle. The display
scrolls at the allowed angle closest to the requested angle. When adjusted with the knob,
only available angles are selected.
Each display has its own Waterfall Scroll Angle. This entry field can be linked to both
displays by using the [Link] key.
Command: WANG (?) d {, i}
Allocate Memory
Display the Memory Allocation menu.
Total Available
Displays the total memory available for storage, either 992, 2016 or 4066 blocks,
depending upon the amount of installed memory. Each block is 2 kPoints (2048 points).
The total of the Capture, Waterfall and Arbitrary memory allocations cannot exceed the
Total Available memory. It may be necessary to decrease one allocation in order to
increase another.
Command: MMEM ?
Capture Memory
Allocates memory blocks for the capture buffer. The allocated Capture Memory sets the
limit for the Capture Length. Capture memory must be allocated before the capture buffer
may be used.
Waterfall Memory
Allocates memory blocks for waterfall storage. Waterfall memory must be allocated
before waterfall displays may be used.
Arb. Memory
Allocates memory blocks for the Arbitrary Source waveform. The Arbitrary Source can
also use the capture buffer as the output waveform.
Clear Allocation
Clears the existing memory allocations in this menu.
Confirm Allocation
Places the memory allocations in this menu into effect. Exiting this menu without
pressing <Confirm Allocation> will cancel any adjustments made in this menu.