Chapter 5
Analog Output
©
National Instruments Corporation
5-5
Figure 5-3.
Analog Output Timing Options
USB-621
x
devices feat
u
re the following AO (waveform generation) timing
signals:
•
AO Start Trigger Signal
•
•
•
AO Sample Clock Timebase Signal
AO Start Trigger Signal
Use the AO Start Trigger (ao/StartTrigger) signal to initiate a waveform
generation. If yo
u
do not
u
se triggers, yo
u
can begin a generation with a
software command.
Using a Digital Source
To
u
se AO Start Trigger, specify a so
u
rce and an edge. The so
u
rce can be
one of the following signals:
•
A p
u
lse initiated by host software
•
(USB-6211/6215 Devices)
PFI <0..3>
•
(USB-6212/6216 Devices)
PFI <0..15>
•
(USB-6218 Devices)
PFI <0..3>, PFI <8..11>
•
AI Start Trigger (ai/StartTrigger)
20 MHz Time
bas
e
100 kHz Time
bas
e
Progr
a
mm
ab
le
Clock
Divider
AO
Sa
mple Clock
Time
bas
e
Ctr
n
Intern
a
l O
u
tp
u
t
AO
Sa
mple Clock
PFI
PFI
Sa
mple Clock
Time
bas
e Divi
s
or
