synchronizing a pulse generator and a A/D read

[TeBlues]

4-8-08


I have a requirement to measure an analog feedback during a 1%, 2% and 20 % duty cycle. I need to sample the signal during the 35 usec that the duty cycle is low.

I?m using a NI-9172 chasse with a NI-9401 in slot 5 to create the different duty cycles. I have 3 NI-9221s in slots 1, 2, and 3. 1 channel of the 9221 in slot 3 is the one I?m trying to synchronize with the duty cycle pulse A NI-9211 in slot 4, and NI-9485 in 6, 7 and a NI-9481 in slot 8.

I tried triggering the read task with the output of the counter generating the duty cycle pulses but every time my vi gets to this steep I get a resource unavailable error. I have tried the DAQmx connect vi but I loose my duty cycle when I connect it to anything else.

I have tried hardwire jumpers to other inputs and many other things. Dose anybody have any ideas how I can synchronize these two signals.

Thanks

[J_Thomas]

This is a duplicate post. Please refer to this <a href="http://forums.ni.com/ni/board/message?board.id=40&amp;message.id=6073" target="_blank">link</a> for further
information.





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