Specifications

The vertical slider controls the value of “offset” and the horizontal slider controls
the variable “inc.” When the toggle switch is in the DDS (direct digital synthesis)
mode, the horizontal slider modifies “inc” to generate lower resolution/higher
frequency waveforms. When in the PPC (point per cycle) mode, the slider modifies
the ALG:SCAN:RATIO command of Algorithm 1 to vary how many trigger cycles
to wait before executing the algorithm and writing different data to the output
channel. This has the effect of slowing down the waveform and lowering its
frequency. Algorithm 2 simply copies each value of channel 132 to the FIFO every
trigger cycle. With Algorithm 1 only executing at some multiple of the trigger rate,
there will be repeated FIFO readings of the same value indicating a slower
frequency.
The “Offset/Frequency” object has the SCPI commands used to control the scalar
variable updates and the object “Download Waveform” controls writing to the array
“waveform” in Algorithm 1.
VEE Programming Examples
Modification of Variables and Arrays
Chapter 5 167
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