Ao Write on 6011

[p901]

"I have a 4 x 14,700 single precision text file and I want to download it into the ao buffer of a 6711 and run that file continuously at 200 samples/sec. What I need to do is to compare what is comming into an input of a 6071 to the actual file that went into the buffer.
In the ao buffer write (scaled array).vi there is a display that is called number of updates done. After correctly sizing the buffer and starting the 6071 adc and 6011 daq together, I tried compairing the updates done with the row locations of the file. What I noticed was that the locations of what is being sent out to the 6011's daq was about 600 updates faster than the file row locations.
I do not want to compare daq outputs with adc inputs. Any suggestions?

[RIO-Todd]

I'm a little confused with the explanation, but I'll try my best to help with your question.

So it looks like you're wanting to compare the analog inputs acquired with the 6071E to the file that you're writing to the 6711.

What if you synchronized the analog outputs and analog inputs so that both operations shared the same clock? You could synchronize both operations via a RTSI cable so you compare the inputs with the file data and be confident both were outputted/inputted at the exact same time. Both operations would start at the exact same instant in time and you wouldn't be off by the 600 updates. Do you think this would this work?

Both devices have a RTSI connection and so you could share the analog output or analog input clock through the RTSI bus t
o allow for synchronization.

RTSI Bus Cables
http://sine.ni.com/apps/we/nioc.vp?cid=3544〈=US

I hope this helps.

Regards,

Todd D.
NI Applications Engineer