Hello,
firs, my setup:
LabVIEW 2013 + Sound & Vibration Suite
cDaq 9172
NI 9423 DI (frequency via Keyence LED Light sensor)
Ni 9215 AI (vibration vie 3-axis force sensor)
With this hardware, i want to measure the vibration of a fan-motor at different speeds. The rotation speed is measured with a light sensor looking through the fan blades (23 blades in total). I can control the motor speed with LV and will let it run from 500 rpm to 4500 rpm in a linear ramp in ~ 10 to 20 seconds.
What i need to know is the best method to geht the most exact values of frequency and analog input values. I need to be sure, which analog values go with which frequency values, because I will do a spectral analysis later on.
I can live with getting all values at the same time after the ramp has finished.
Do i put both channels inside one Task in MAX to get the same timing? Doing so would mean the slowest card would set my maximum sample rate?
Are there better ways? Is it best to use finite sample mode?
Thanks for your help guys!
Greetings from germany