- DAQ M Series NI USB-621x User Manual

Chapter 7 Analog Output

Analog Output Timing Signals

Figure 7-3 summarizes all of the timing options provided by the analog

output timing engine.

Figure 7-3. Analog Output Timing Options

USB M Series devices feature the following AO (waveform generation)

timing signals.

• AO Start Trigger Signal

• AO Pause Trigger Signal

• AO Sample Clock Signal

• AO Sample Clock Timebase Signal

AO Start Trigger Signal

Use the AO Start Trigger (ao/StartTrigger) signal to initiate a waveform

generation. If you do not use triggers, you can begin a generation with a

software command.

Using a Digital Source

To use ao/StartTrigger, specify a source and an edge. The source can be one

of the following signals:

•A software pulse

• PFI <0..3>, PFI <8..11>

• ai/StartTrigger

20 MHz Timebase

100 kHz Timebase

Programmable

Clock

Divider

ao/SampleClock

Timebase

Ctr

Internal Output

ao/SampleClock

PFI

SampleClock

Timebase Divisor