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 My mom's cousin heard from her friend who heard from her brother who heard from his barber who heard from his son that his teacher told him that his father's brother's sister's former roommate heard from Frank himself. - notmattlythgoe [more] |
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DO write speed
I was experimenting with the output speed and jitter, because I was considering using it as a simple tone generator.
I was having a lot of trouble with jitter, and so I finally tried a test that would just modulate a digital output as fast as possible. (before I had been regulating it with RT wait functions, in micro-seconds) I found that it had a limit at about 280 micro-seconds to switch between the ON and OFF states. In looking at the NI 9403 Operating Instructions, it says the module has a propagation speed of 330 nanoseconds, at maximum. So why might I be seeing a limit 1000 times slower than that? Is there some huge overhead that is slowing the processor down? I've been deploying it as a startup application, so I know it's not because of any communications on the network. 
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