Does the antialias doesn't work for scxi 1141?

[avi2008]

Hi,

am using an PXI-1052 chassis with a DAQ 6052E for dynamic analysis.  I'm using an SCXI 1140 cascaded with an SCXI 1141 filter and SCXI 1120D amplifier. My goal is to acheive low-noise, filtered data. I configure my hardware so that the data goes into SCXI 1120D cofigured in parallel with SCXI 1141 and this in parallel with SCXI 1140. For short, I want to test if the antialias work. I was generated a sinusoidal data with a frecvency of 600Hz and sample rate of 1024 and I obtained an alias of 424Hz. The filter  was disable. When I enable the filter with a cutoff frecvency of 500Hz the alias doesn't disappear. What is wrong. Does the antialiasing working for this module? My channels are set up as Traditional NI DAQ.

[ColeTrain · Accepted solution]

Hello Avi,

I am having a hard time trying to piece together how your samples are defined and how your signal is actually routing through hardware.  Is the 1120D on the front of the 1141 and then the 1140 is in the slot next to those?  You just said there were a lot of things in parrallel and now I am confused.  Thanks for the clarification!

[avi2008]

 Hello ColeTrain,

 The samples are generated with PXI 6052E at rate of 1024.  The signal is carring out by wire at input of SCXI 1120D. The SCXI 1120D is cascaded through a SCXI 1335 with eliptical filter, SCXI 1141. The  SCXI 1141 is cascaded through a SCXI 1335 with sample and hoder, SCXI 1140. With another SCXI 1335 cable I take the signal and I input it at entrance of analog input PXI 4472. With this module I make the reading and I display analyzed data at the same rate of 1024.

 Best regardes,

 LaurentiuA

 Physicist