I need to synchronize two (or more) AI channels with at least one AO channel. So far, it's been straightforward to sync one AI with the AO. I used the method in the "simultaneously_started_aiao.vi" example, and it works fine.The problem is when I add another AI channel, it is not in sync with the others; it seems to have some random timing that wanders around.Now, I could use a single task with multiple inputs, but this won't allow me to set separate voltage limits (gain) and sample rates for each input channel, so I I'm forced to use two separate tasks.However, I'm not allowed to have two starts on ai (even with separate tasks), nor can I set a trigger on, say, ai1 with ai0 as a source. I tried something in (attached) simultaneously_started_aiao1.vi, but it's not working, and I'm stuck.Any ideas?Also, separate question: The first data point of the ai in the example (simultaneously_started_aiao1.vi) is always off - rerun it a few times and you'll see that the ai data's first point is off by a "random" amount. Why does this occur? It's clearly not correct.Thanks for any help!(Running Labview 7.1)

Multifunction DAQ

how do I synchronize multiple ai

Hi Jordan,

If I look at each channel separately, they both measure between 15-20mV with a signal on (I'm measuring the voltage of photodiodes). With the signal off, I measure a voltage of 2-3mV. If the trigger pulse in not in sync with the signal then I measure 2-3mV. If you look at the front panel picture that is attached above, you can see that channel 1 (white trace) is reading a signal but channel 2 (red trace) isn't. Both channels should be reading a voltage around 20mV. If I switch the channels around so that channel 2 in created first then channel 2 will measure around 20mV and Channel 1 will measure 2mV.

I hope this makes sense. Thanks for your time.

Ben