User`s manual

High Speed Operation Program Comments
The following comments give additional details on the program examples in
this chapter.
Amplitude Effects
on DAC Codes
The AFG stores the Signed or Unsigned DAC codes directly into memory.
Thus, the amplitude setting has no affect on the codes. Unlike sending a
voltage list, the output amplitude can be set to any of the values listed in
Appendix B. The amplitude does not have to be
≥ to the maximum DAC
code value.
Incorrect AFG
Operation from
Incorrect DAC
Codes
The AFG requires that the data it receives must be correct, or it will not
execute it correctly. Unlike using other data transfer methods, the AFG
does not perform any error checking on the data when it is directly
downloaded.
DAC Sources The AFG has the following DAC sources available to download data to the
DAC:
INTernal – The
[SOURce:]LIST[1] subsystem/built-in waveforms.
DPORt – The front panel’s “Digital Port In” connector
LBUS – The VXIbus Local Bus
VXI – The VXIbus backplane
Download Sources The AFG has the following sources available to download waveform
segments and segment sequences into memory:
DPORt – The front panel’s “Digital Port In” connector.
LBUS – The VXIbus Local Bus.
VXI – The VXIbus backplane.
Determining the
Size of the
Combined Segment
List
Use [SOURce:]LIST[1][:SEGMent]:COMBined:POINts? to determine the
size of the number of points of the waveform segment and marker pulse list
of the currently selected waveform segment.
Determining the
Size of the
Combined Segment
Sequence List
Use [SOURce:]LIST[1]:SSEQuence:COMBined:POINts? to determine the
size of the number of waveform segments, marker pulse enable lists, and
repetition count lists of the currently selected segment sequence.
280 High Speed Operation Chapter 7