With single trigger, I want to acquire two channel in sequence

[Rajan C]

I wanted to observe the sequence of  effects on more than two channels with respect to a single trigger input. And also I wanted to measure each channels with different " number of samples". For example Firstt channel with 10 samples and second with 500 samples. How I can implement this on PCI 6034 and USB 6008 DAQs 

[TroyK]

The 6008 has only very basic functionality.
I would say to achieve the results you want you will need to add multiple channels to a single task, all at the same rate, and only extract the data you need.
That way all channels will be synchronized.

I don't think the 6008 can even do correlated digital-analog I/O or trigger off an input channel.

I don't have any experience with the PCI 6034, but if you only need 500 samples then the method I mentioned above should work regardless.