-20020 filter error allthough fc < 0.5fs

[aspired]

I am using a DAQ6052E, SCXi 1121, 1125 for measuring 4 channels.

I need to filter the data of the fourth channel.
I am acquiring at a rate of 1000hz. My LowFc = 0.01 and my high FC is 40hz. still I am getting that error -20020. I tried playing around with the filter parameters however that isnt working.

why is the filter giving this error ?
I have attached my vis.
thanks aton
shubha

[DSPGuy]

The conversion of your array data (channel 4) into dynamic-datatype form results in the dt being 1 (implies Fs=1Hz). I would suggest using the "Build Waveform" primitive, and wire 1/Fs to the dt input. This will ensure that the waveform carries the correct sampling rate information. See the attached VI for example (Fs=1000Hz, sine tone freq=50Hz).

[aspired]

Thank you! You were very helpful