help to check my project convert digital signal (count edge ) to RPM

[andriawan]

I want to get RPM from Motor use rotary encoder

and insert to colom N on table measurment..

but i doubt , my project is true or wrong..to convert digital signal ( pulse ) to RPM

i used count edge on USB DAQ 6008

Please help me to check in green border..

this is project i create

i copy at this article http://www.ni.com/example/13580/en/

[LDob]

Hello andriawan,

Have you tried running your code? What RPM outputs when you run it?

I'm just trying to clarify if this is a troubleshooting question for an error in LabVIEW or a math question for how to convert pulse to RPM. From what I can tell, you followed the example pretty closely except you did not divide the RPM by 1000 to get kRPM.

Lauren

Applications Engineering

National Instruments

[andriawan]

I'm try , but error 20309 in pulse measurement vi. sad:

how solution about it ?

[andriawan]

i use usb daq 6000

[crossrulz]

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@andriawan wrote:

I'm try , but error 20309 in pulse measurement vi

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That error's description is as follows:

Analysis:  The amplitude of the waveform is zero, so the histogram method cannot be used.

In other words, you have no waveform captured.  Please post your actual VI so we can see all of the setups for the DAQ Assistant etc.

[andriawan]

I don't know whether the DAQ Assistant settings are correct or not

[LDob]

Could you open up the DAQ Assistant and show us a screenshot of your settings?

Thanks,

Lauren

Applications Engineering

National Instruments

[andriawan]

I already know where my mistake , My USB daq does not support reading frequency , because it appears the error . 
is there any other way that can be added to my program to get the value of RPM ?
becouse i confused to setting looping and timing for counting and for my program...