Link digital and analog signal?

Question

Hi, I am trying to "link" a couple of analog signals to a dital signal.
I have a torque transducer with a integral quadrature encoder.  I am also monitoring a couple of other analog signals.
The 3 analog signals are being monitored through simultaneou sampling: 1Mhz for ~1sec
In these analog signals i am capturing certain events (peaks, etc).
What I would like to do is tie these events to the encoder which is tracking "angle" (rotational position).
For example, I determine that the peak torque occured at index 579,397 of the 1,000,000 element array.  What was the angle of the encoder at index 579,397 ????
I am using 7.1
Thanks for the help!
Ryan
Ryan
LV 7.1

Answer 1

Ryan,
Because we share the same name, I've created an example for you.
Basically,  we're using the analog input sample clock to latch the
position of the encoder (connected to the counter). In a finite
acquisition, the exact number of samples you request are generated on
the sample clock. Since we are starting the counter task first, we'll
be waiting on the analog input sample clock to start. This way, the two
tasks will be exactly synchronized. Please let me know if you have any
additional questions.
Good luck!
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments
Attachments:
AI_Encoder_Sync.vi ‏99 KB