measure the speed of the fan in vibration simulator box

[irfan789]

i am trying to measure  the speed through analog in channel of sbRIO 

i am getting few pulse waveform switching to 5v to 0v and vice versa  with variable duty cycle..

  how can i calculate the speed of the fan

provided values on on the simulator box are 

tach out     2 pulses/revolution

maximum speed is 6000RPM

please help me out with this ....

[GerdW]

Hi irfan,

when your tacho provides 2 "pulses per rotation" you need to measure the "pulses per second" to calculate "rotations per second".

Sounds like simple math to me…

[irfan789]

ya even i could figure out the same 

number of pulses measure divided by "2" will give me speed but

i am unable to measure the pulses itself  

i am not clear on how to proceed with that

[Julien_31 · Accepted solution]

Did you take a look at LabVIEW examples ? If you have installed NI-DAQmx, you will find many examples showing how to do event counting or frequency measurements.