Chapter 7 Analog Output

Analog Output Timing Signals

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

 

 

 

 

 

PFI

PFI

 

 

 

ao/SampleClock

 

 

 

 

 

 

 

 

 

 

Ctr n Internal Output

 

 

 

ao/SampleClock

 

 

 

20 MHz Timebase

Timebase

Programmable

 

 

 

 

 

 

 

 

 

 

Clock

 

 

 

 

 

 

 

 

 

 

 

Divider

 

100 kHz Timebase

 

 

 

 

 

 

 

 

 

SampleClock

 

 

 

 

 

 

 

 

 

 

Timebase Divisor

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

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NI USB-621x User Manual