Amplitier and Prefilter of NI9234

[lester14]

It is said that there are prefilter and amplifier in NI9234, but I didn't find any description and specifictions about these two devices? What is the amplification of the amplifier and cutoff frequency of the prefilter?

Thanks.

[Cory_K]

I'm not an electrical engineer, so take this with a grain of salt,

but I dont believe the value for the amplification or cutoff frequency are constant.

They appear to vary based on the measured signal.

Look at page 13 of the manual for a better description.

Message Edited by Cory K on 08-12-2009 12:11 PM

[lester14]

Yes, it varies with different sampling frequency. The specification in Page 13 is for the digital filter but not analog filter or prefilter. Is it the same formula for the analog filter? How about the amplifier?

Thanks.

[lester14]

Any one know that?

[Ipshita_C]

Hi,

It is true that the values for the analog prefilter and amplifier are not provided in the manual. I would call in at National Instruments using this link as this information would be available internally within the company only. 

Ipshita C.