Expect that less than 1 ms.

Yes, I did research on the prior of forum that I posted it. I have a general opinion which I get a reading of messages.

However, the positions are a bit old.

So, I ask the question again hoping that something has been changed in the meantime.

I need to wait 50 microseconds to let the voltage settle prior I perform playback. I do a lot of reading. I want more I have to wait.

Can I do this in LV loop occupied without solutions RT LV?

Kamil

jcarmody wrote:

How do you read the voltage?  50 microseconds is very fast.  Without RT or FPGA I can't believe that you will be able to ensure (or confidence) that the time.

It's just 20 kHz?  There is no that many NI AI devices that have a lower maximum sampling frequency.  But I agree that if you really want to set a value, then wait 50 microseconds, then take an AI then you need RT or FPGA.  If you can frame at least wait 50 microseconds, then configure a task to read two samples at 20 kHz, then throw the first sample.  You could use a trigger to start the Canal when the output is changed.

But what seems more likely to me here is you set an output, then you know it takes at least 50 to install, so you want to wait that long or more before taking the reading.  Attatched is a quick VI who performs a 50us waiting, but then checks how long it takes actually.  He runs while 50us wait 999 again and sees the total time it took to run that should be close to 50ms, but will probably be more.  Windows is not deterministic if you can't rely on this technique to be precise.  What you can say is the wait will be 50 or greater.  How much greater?  Well it's function is Windows doing a defrag?  Or a virus scan?  Or you're calculating pi to billionieme decimal places?

EDIT: And is quite surprising for me the VI I posted would wait is about 50ms + /-1.  Again, your results can vary.

Tags: NI Software

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