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Chapter 5 Analog Output
© National Instruments Corporation 5-9 NI 6238/6239 User Manual
Other Timing Requirements
A counter on your device internally generates ao/SampleClock unless you
select some external source. ao/StartTrigger starts the counter and either the
software or hardware can stop it after a finite generation completes. When
using an internally generated ao/SampleClock, you also can specify a
configurable delay from ao/StartTrigger to the first ao/SampleClock pulse.
By default, this delay is two ticks of ao/SampleClockTimebase.
Figure 5-6 shows the relationship of ao/SampleClock to ao/StartTrigger.
Figure 5-6. ao/SampleClock and ao/StartTrigger
AO Sample Clock Timebase Signal
The AO Sample Clock Timebase (ao/SampleClockTimebase) signal is
divided down to provide a source for ao/SampleClock.
You can route any of the following signals to be the AO Sample Clock
Timebase (ao/SampleClockTimebase) signal:
•20MHzTimebase
• 100 kHz Timebase
•PXI_CLK10
• Input PFI <0..5>
•RTSI<0..7>
•PXI_STAR
Note Refer to the NI 6238/6239 Specifications for the minimum allowable pulse width
and the propagation delay of PFI <0..5>.
ao/SampleClockTimebase
ao/StartTrigger
ao/SampleClock
Delay
From
Start
Trigger