Multiple channels, different sample rates in 1520?

[cb34]

Hi, I am a newbie here!

My question is how to get signals from different channels in an SCXI 1520. I already know how to do the multiple channel stuff but I dont know how to have different sampling rates for each channel because most examples have only one sampling rate for all.

Please help me on this. Thanks!

[Ben]

Hi cb34,

The examples show one sample rate for all channels because the hardware has a single clock that controls the acq rate. When more thatn one sample rate is required, the common techinique is to sample all channels at the highest rate and then post process the data down to a slower rate. This is usually handled by decimating. See the link below for a recent conversation on this subject.



http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000EAF30000&USEARCHCONTEXT_CATEGORY_0=_49_%24_6_&USEARCHCONTEXT_CATEGORY_S=0&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0

I hope this helps,

Ben