WHITE BROWN DA 918 Manual do Utilizador descarregar pdf (Página 106)

NI cDAQ-918x/919x User Manual

Using an Internal Source

To use Counter n Sample Clock with an internal source, specify the signal source and the

polarity of the signal. The source can be any of the following signals:

• DI Sample Clock

• DO Sample Clock

• AI Sample Clock (ai/SampleClock, te0/SampleClock, te1/SampleClock)

• AI Convert Clock

• AO Sample Clock

• DI Change Detection output

Several other internal signals can be routed to Counter n Sample Clock through internal routes.

Refer to Device Routing in MAX in the NI-DAQmx Help or the LabVIEW Help for more

information.

Using an External Source

You can route any of the following signals as Counter n Sample Clock:

• Any PFI terminal

• Analog Comparison Event

You can sample data on the rising or falling edge of Counter n Sample Clock.

Routing Counter n Sample Clock to an Output Terminal

You can route Counter n Sample Clock out to any PFI terminal. The PFI circuitry inverts the

polarity of Counter n Sample Clock before driving the PFI terminal.

Counter n Internal Output and Counter n TC Signals

The Counter n Internal Output signal changes in response to Counter n TC.

The two software-selectable output options are pulse output on TC and toggle output on TC. The

output polarity is software-selectable for both options.

With pulse or pulse train generation tasks, the counter drives the pulse(s) on the Counter n

Internal Output signal. The Counter n Internal Output signal can be internally routed to be a

counter/timer input or an “external” source for AI, AO, DI, or DO timing signals.

Routing Counter n Internal Output to an Output Terminal

You can route Counter n Internal Output to any PFI terminal.

Frequency Output Signal

The Frequency Output (FREQ OUT) signal is the output of the frequency output generator.

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