Velocity from phidget encoders

[ggpoly]

*I'm using the 3530 encoder and it is wired to a 1047

http://www.phidgets.com/products.php?category=7&product_id=3530_0

 

http://www.phidgets.com/products.php?category=7&product_id=1047_1

We started by taking the diameter of the roller  (2.246 in), that the encoder is attached to, and using that to find the circumference.  It was 0.588 ft/revolution.  We took 4*360 to get the 1440 pulses/revolution.  Then I took the time output and divided by 1000 to get from ms to s and then divided again by 60 to get to min.  All of this math gave us a conversion factor of 24.5, which is the number you see in the VI velocity conversion VI.  We are trying to get our output velocity in ft/min.

Here's our math:

Velocity= Circumference  = 0.588 ft/rev                                           = 0.588 * 1000 * 60 = 24.5

                 (pulses/rev)(Δt)    (4*360 pulses/rev)((1/1000)*(1/60))               1440

It just isn't giving anything that looks like a velocity recording, let alone the proper velocity.  I don't know if it's my code or if I'm just not reading the right outputs from the phidget itself.  

[Tirmizi]

What value do you get instead of the correct velocity needed for example as mentioned if velocity value desired is 24.5 then what value you get instead of that.

can you sttach the snapshots fo your all vis mentioned as i cannot open these vi in my LV, some version issue.