National-instruments Data Acquisition Device E Series Manual de usuario descargar pdf (Pagina 91)

Chapter 3 Analog Output

Using an Analog Source

When you use an analog trigger source, the samples are paused when the

Analog Comparison Event signal is at a high level. Refer to Chapter 10,

Triggering, for more information on analog triggering.

AO Sample Clock Signal

You can use the AO Sample Clock (ao/SampleClock) signal to initiate AO

samples. Each sample updates the outputs of all the DACs.

The source of the ao/SampleClock signal can be internal or external. You

can specify whether the DAC update begins on the rising edge or falling

edge of the ao/SampleClock signal.

Using an Internal Source

By default, ao/SampleClock is created internally by dividing down the

ao/SampleClockTimebase.

Several other internal signals can be routed to the sample clock. Refer to

Device Routing in MAX in the NI-DAQmx Help or the LabVIEW 8.x Help

for more information.

Using an External Source

You can use a signal connected to any PFI or RTSI <0..6> pin as the source

of ao/SampleClock. Figure 3-8 shows the timing requirements of the

ao/SampleClock source.

Figure 3-8. ao/SampleClock Source Timing Requirements

Rising-Edge

Polarity

Falling-Edge

Polarity

= 10 ns minimum

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National-instruments Data Acquisition Device E Series Manual de usuario Pagina 91