Unit delay connected to pulse generator

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V Vaishnavi Kumar 2012-11-24

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I connected pulse generator followed by unit delay to scope, in pulse generator period is 1 sec, pulse width 5%, In unit delay sample time is -1 (inherited)

But the pulses from unit delay are little delayed nearly 0.05 sec(width of actual pulse) and pulse width is 20%

I checked this with a mean block,I expected that unit delay would give delay of 1 sec by default to the pulses with width 5%

what unit delay does here.?

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Azzi Abdelmalek 2012-11-24

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编辑：Azzi Abdelmalek 2012-11-24

You said that Sample time is inherited, which means it's inherited from your step size (variable or fixed). If you want 1s then set a sample time to 1.

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V Vaishnavi Kumar 2012-11-24

I dint specify any step size first, and matlab took as 0.2 sec by default. Then i gave 1 sec as sample time and the scope showed step output for same pulse input.

I understood that as my sample time is greater than pulse width(0.05 sec) it showed so., i kept sample time as 0.01 sec. now output is similar to input with the delay of 0.01 sec as given.

for the same pulse width with 0.05 sec and 1 sec period, how 1 sec delay could be given