Measure a Voltage Pulse

[Choover]

I have a tachometer used to measure our centrifuge that puts out 5v every time it makes a full turn. I need to read the frequency of this 5v blip (0 volts otherwise) in Hz or RPM's - (Prefer Hz). I am not sure how to build this VI in labview, as I become confused on what to do after the voltage is acquired. From there can I measure the frequency of this 5v pulse that is generated? Which function would be best for this? I should be able to do the math from that point. Or would I use some kind of counter?  I am fairly new to labview; plan on taking courses but as of right now any help would be greatly appreciated. Thanks!

Chris

[P@Anand]

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@Choover wrote:

I have a tachometer used to measure our centrifuge that puts out 5v every time it makes a full turn. I need to read the frequency of this 5v blip (0 volts otherwise) in Hz or RPM's - (Prefer Hz). I am not sure how to build this VI in labview, as I become confused on what to do after the voltage is acquired. From there can I measure the frequency of this 5v pulse that is generated? Which function would be best for this? I should be able to do the math from that point. Or would I use some kind of counter?  I am fairly new to labview; plan on taking courses but as of right now any help would be greatly appreciated. Thanks!

Chris

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You are reading the Tachometer input that is giving 5V pulse when it completes a rotation. You tried to compare it with "5"?

Analog input will never give you a value exactly what you are expected, it should always have tolerrance of atleast 2% added to your expected input.

I have added a quick example on calculating RPM Value this may not give you precise result but it will give a kick start for you to use low level VI's

Good luck