National Instruments Order Analysis Toolset - Manual (Page 50)

Chapter 5 Calculating Rotational Speed
LabVIEW Order Analysis Toolset User Manual 5-4 ni.com
Figure 5-2 shows an example of the rotational speed calculated from the
tachometer pulses.
Figure 5-2. Cumulative Revolution and Rotational Speed
In Figure 5-2, the dotted line represents the results of calculating the
rotational speed with no averaging. The solid line in Figure 5-2 represents
the results of calculating the rotational speed averaged by five. As
Figure 5-2 shows, the averaged rotational speed is smoother than the
non-averaged rotational speed.
3059.3
3055.0
3050.0
3045.0
3040.0
19.2 19.3 19.4 19.5 19.6
Rotational Speed (RPM)
Speed (No Average)
Speed (Averaged by 5)
Time (s)