DAQ assistant encoder

[Jack@Newcastle]

Hardware: DAQcard PCI-6250.

I'm trying to look at a signal from a vibration sensor and relate it to the angle of a rotating shaft measured with an optical encoder.

I've used two DAQ assistants inside a while loop.  Both of them work OK independently, but the encoder part only takes one measurement at the start of each loop (vi attached).

Does anybody know how I can synchronise its measurements to the vibration sensor?

All suggestions gratefully accepted...     Jack

[KostasB]

Hi Jack

Your program is reading continuously from the vibration sensor at 1KHz while you are reading one sample on demand (software-timed sample) from the optical encoder. Therefore, they are out of sync.

You should modify the timing settings to match each over. Double-click the DAQ Assistant and configure the task parameters.  What kind of sampling frequency is appropriate for the vibration sensor and the optical encoder in your application?

KostasB

NI UK