Product specifications

Instrumentation Laboratory Exercise 56
Place a strip chart to view the converted waveform. Also right click
it, and set the horizontal scale (found at the left side bar when you
click Properties) to 2000 points. The array must have the MSB- LSB
bytes swapped as previously.
Also we will calculate the period of the signal as previously, by
finding the first and second positive going transitions crossing the
upper threshold level UT. We are interested in the frequency of the
signal, so we will convert it to cycles per second (Hz) rather than
rpm. In the formula box we will divide 80,000 by the difference in the
transitions indices (for example, second index – first index).
To calculate the signals amplitude we could use the maximum value
minus the minimum value, but this would make us more susceptible
to individual noise spikes. Instead, we can first remove the offset of
the wave form, then calculate the Root Mean Square (RMS) value.
This is performed in a single formula box which we have named Offset
and RMS. The waveform is fed in along with the average value of the
wave form. The formula is then rms (B–A) where B is the array of
data, A is the average value of the data, and rms ( ) is a preexisting
function in VEE. This rms amplitude should be displayed in an
AlphaNumeric box, and fed into the Y coordinate of an X vs Y plot.