how to measure the speed in rpm from digital tachometer using sbrio

[irfan789]

i getting  pulses from a digital tachometer and with that i want to measure the speed of the fan

haw can i do that using NI sbrio

i am able to see the digitalpuses switching from 5V to oV...

[GerdW]

Hi irfan,

you have been asking this very question in several other threads.

Here, here, here.

You even mentioned the speed is measured accurately…

PLEASE STOP creating double posts!

PLEASE STOP asking the same question in several threads!

[irfan789]

i sincerely apolozise if creating new thread is not allowed on this community 

problem with the speed measured is sampled per second (my measured speed updates only after one second )

but i need to decrease measuring time to less than a second so i am in search of it 

how can i do that.?

[GerdW]

Hi irfan,

of course it's allowed to create new threads.

But it is annoying to answer the same qeustion in several threads again and again. So I (strongly) suggest: Stick with one thread per topic!

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problem with the speed measured is sampled per second (my measured speed updates only after one second ) but i need to decrease measuring time to less than a second so i am in search of it

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Your measurement speed aka sample rate is determined by your Counting FPGA loop as presented in those other threads. You have it programmed to measure for one second. Now you just need to change one parameter to let that loop run just 0.1s…

So again I have to ask: Why did you create a new thread for that question?

Especially when you don't ask for that specific problem in the first post of this thread!?