National Instruments NI 6238 用户手册

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The counter can output a single pulse. The pulse appears on the Counter n 
Internal Output signal of the counter.

You can specify a delay from when the counter is armed to the beginning 
of the pulse. The delay is measured in terms of a number of active edges of 
the Source input.

You can specify a pulse width. The pulse width is also measured in terms 
of a number of active edges of the Source input. You also can specify the 
active edge of the Source input (rising or falling).

Figure 7-22 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 7-22.  Single Pulse Generation

The counter can output a single pulse in response to one pulse on a 
hardware Start Trigger signal. The pulse appears 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 the 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.

After the Start Trigger signal pulses once, the counter ignores the Gate 
input.

Figure 7-23 shows a generation of a pulse with a pulse delay of four and a 
pulse width of three (using the rising edge of Source).

SOURCE

OUT

Counter Armed