simultaneous-sampling architecture of PCI 6110/6115

[stephenzhou74]

Hi

I have a question about the simultaneous-sampling architecture of PCI 6110/6115. I am sampling two analog signals using two channels (PCI 6110) right now. I hope these two input signal are sampled "exact" simultaneously. I know PCI 6110/6115 is a simultaneous multifunction DAQ card. From the following link,
http://sine.ni.com/apps/we/nioc.vp?cid=11884〈=US
There is a sentence "Using custom ASIC technology and a sophisticated simultaneous-sampling architecture, the NI 6115 devices deliver reliable measurements for PCI and PXI.�

I am interested in the �sophisticated simultaneous-sampling architecture�, unfortunately I didn�t find it from NI website. Does anyone know where I can find it? Is there any time
delay (or uncertainty) between two channels (PCI 6110) to make it not �exact� �simultaneous�.

Thanks

[Bob_Preis]

http://www.ni.com/pdf/products/us/3daqsc196-197_190_185-186_221-230.pdf

Interchannel skew is typically 1 nanosecond according to the spec sheet. To find this information, I simply clicked on your link, then selected the PCI-6115 (left margin of webpage), then clicked on specs link...

[susala]

I am also has a question: is simultaneous sampling exact simultaneous?

We have PCI 6115 and want to measure cross-correlation between two signals. For this purpose simultaneous data sampling is needed.

If I put the same signal to two analogue channels (AI0 and AI1), I hope to get an identical numbers, but I do not.

Is there a possibility to get exact simultaneous sampling with PCI 6115?