sinusoidal pulse

[millansf]

I would to generate a sinusoidal pulse (burst). I´m working with cRIO and the analog output ni 9263. I try this VI, but I only get a pulse train with variable amplitude

[rpursley]

Your loop timer was set to 1 ms and the frequency of your sinusoid was 10 kHz (period = 100 us), so you are undersampling your sinusoid which is why you see what you see.

QUOTE(millansf @ Sep 29 2007, 10:29 AM)

I would to generate a sinusoidal pulse (burst). I´m working with cRIO and the analog output ni 9263. I try this VI, but I only get a pulse train with variable amplitude

[millansf]

QUOTE(rpursley @ Sep 30 2007, 02:26 AM)

Your loop timer was set to 1 ms and the frequency of your sinusoid was 10 kHz (period = 100 us), so you are undersampling your sinusoid which is why you see what you see.

But if I want to get a sinosuidal pulse, the period of the loop timer must be bigger than the period of the sinusoid. For example i want 5 periods of the sinusoid inside a period of thepulse train

thanks!

[rpursley]

The loop period sets the rate for each point that the sine generator produces not for each cycle (or group of points). For example, if you want to generate a sinusoid at 10 kHz that consists of 100 points/cycle, then your loop timer must be set to 1 us.

QUOTE(millansf @ Sep 30 2007, 04:46 AM)

But if I want to get a sinosuidal pulse, the period of the loop timer must be bigger than the period of the sinusoid. For example i want 5 periods of the sinusoid inside a period of thepulse train

thanks!