Cannot sample at 5kHz using 1011 chassis/PXI 6052e and SCXI1102

[weicha13]

My hardware is 1011 chassis/PXI 6052e/SCXI-1102.
The problem is when I sample at 5kHz, there always some channel return the wrong data,I dont know why.

can 6052E sample at 333kS/s with 1011?

It says that 1011 has a Max rate 333kS/s at 12bit,what is means? I think 12bit or 16bit is the same to the backplane bus.

[RIO-Todd]

You definitely should be able to sample at 5 kHz with your setup. To ensure of 16-bit accuracy, you will need to allow for 10 usec. of settling time and so the maximum sampling rate would be 100 kHz. You can sample at 333 kHz, but you won't have 16 bits of accuracy.

16-bit DAQ Boards and SCXI Accuracy
http://digital.ni.com/public.nsf/websearch/F6D3D99501D9893486256BF300838E7D?OpenDocument

It sounds like you might be running into a charge injection/cross-talk problem. Cross-talk can be caused by inputs with a high source impedance. If your inputs have a source impedance over 1 Kohm, then that might be causing the cross-talk. There are documents on our website that discuss ways to decrease the source impedance in order to eliminate cross-talk. I've incl
uded links below to these documents. I hope this helps.

Is Your Data Inaccurate Because of Instrumentation Amplifier Settling Time
http://zone.ni.com/devzone/devzoneweb. nsf/Opendoc?openagent& F7B07C1AEFAC727B8625686500693572


Using a Unity Gain Buffer (Voltage Follower) with a DAQ Device
http://zone.ni.com/devzone/conceptd.nsf/ webmain/ CD57A73721E0612586256BAE0055CDD9?opendoc ument


Regards,


Todd D.