I want to use NI PXI-4461 to generate and measure signals which frequency is up to 100 KHz. The sample rate will be up to 204.8 kS/s.
My question is: May I use one of its outputs to generate signal with sample rate of 204.8 kS/s and to measure this signal with the two inputs that NI PXI-4461have at the same time. The sampling ate for the inputs will be 204.8 kS/s.
Yes indeed you can simultaneously generate and acquire on a single 4461. The sampling rates of each channel need to be related. So each channel would need to be either the same as the first configured channel or some 2^n division of the first configured sample rate. Since you want to run everything at 204.8kS/s that should be fine.
Note that some of the DSA boards (especially the 24-bit ones) have a delay between when you start the task and when you get your first sample. A co-worker was wanting to do the very thing you're trying and found this out. The delay is documented in the manual for the board and affects both the a/d and d/a channels (search 'filter delay' in the manuals for the device). Basically, you get zeroes until the delay is overcome. Luckily, it is repeatable so you can just throw out a fixed number of samples to get rid of the zeroes.
