09-24-2018 12:57 PM
Hello all,
I am performing a dynamic test using a piezo actuator PI 843.60 with a built-in displacement sensor in close loop and a force sensor from PCB 208C02. The modules I am using are NI 9269 to send a sinusoidal signal and NI 9215 to receive the data. I was wondering if anyone has ever have problem in which the phase between the input signal to the actuator and the displacement signal back from the sensor switches sign at a certain frequency. I analyzed the data with fft in Matlab and it doesn't seem like we have any resonance. I attach the graph I am getting.
Thank you for the help.
Solved! Go to Solution.
09-24-2018 02:46 PM
Try unwrapping phase.
You can use this VI found in the LabVIEW palettes:
09-25-2018 11:25 AM
Thank you!