National-instruments Data Acquisition Device NI USB-621x Bedienungsanleitung PDF herunterladen (Seite 114)

Chapter 8 Counters

Figure 8-22 shows a generation of a pulse with a pulse delay of four and a

pulse width of three (using the rising edge of Source).

Figure 8-22. Single Pulse Generation with Start Trigger

Retriggerable Single Pulse Generation

The counter can output a single pulse in response to each pulse on a

hardware Start Trigger signal. The pulses appear on the Counter n Internal

Output signal of the counter.

You can route the Start Trigger signal to the Gate input of the counter. You

can specify a delay from the Start Trigger to the beginning of each pulse.

You also can specify the pulse width. The delay and pulse width are

measured in terms of a number of active edges of the Source input.

The counter ignores the Gate input while a pulse generation is in progress.

After the pulse generation is finished, the counter waits for another Start

Trigger signal to begin another pulse generation.

Figure 8-23 shows a generation of two pulses with a pulse delay of five and

a pulse width of three (using the rising edge of Source).

Figure 8-23. Retriggerable Single Pulse Generation

For information about connecting counter signals, refer to the Default

Counter/Timer Pinouts section.

SOURCE

GATE

(Start Trigger)

OUT

SOURCE

GATE

(Start Trigger)

OUT

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National-instruments Data Acquisition Device NI USB-621x Bedienungsanleitung Seite 114