analog input signal frequency limitation of NI PXI 6363

[GopalSarkar]

Hi friends

Presently i am working with NI PCIe-6363 data acquisition card. During checking with analog input/output, i have faced one problem. Above 100 Hz sin wave signal as a analog input is not working properly. It's frequency & amplitude are changed above 100Hz. But i know that it's analog sample  frequency is 2 MSPS for single channel. So, i can process signal upto 1 MHz technically. but practically i am seeing that when input signal is above 100 Hz, it's  characteristics are changed.
Have any limitation for input analog signal frequency ?
Have any low pass filter setting inside this card ?
How can i process 100 KHz signal as an analog input ?
Your kind reply with proper solution regarding my problem is highly appreciated.

Note: I have attached my sample c code as your reference.

Regards

Gopal ...

[Dennis_Knutson]

Twice you say 100 Hz and then you say 100 kHZ. Which frequency are you actually inputting? Your sample rate in the example code is set for 100 kHz so it's to slow by half for 100 kHz.

[GopalSarkar]

Hi Dennis

Thanks for your kind reply..

Hope that you are not getting my question clearly.

ok, I  try to clear it.

Suppose , in my example code, i set sample frequency is 100KHz. so, i can process signal correctly upto 50KHz technically.

But in my practical testing, i have seen that above of 100Hz, i can't process any signal. Above of 100Hz input analog signal,

attinuate it's amplitute and modulated it's frequency. Finally  I will set sample frequency 1 MHz, will process signal 100Khz that 

is my target.

Kindly tell me, why i can't not process signal above 100Hz ?

Have any analog input frequency range limitation ?

wait for your reply soon

Regards

Gopal ..

[Dennis_Knutson]

There should be no issue at all acquiring a 100 Hz signal. I can't really review your c code but you should be able to use the test panel in MAX to do a simple acquisition. Be sure to request enough samples. A good rule of thumb is to request 10% of the sample rate. In other words, for 100 kHz rate, request 10k samples.

[GopalSarkar]

Thanks Dennis.

I have solve my initial problem by your share idea. But when i set above of 200Khz sample rate, it is not work properly for analog input signal

(it's may 1Khz to 50Khz) which i am giving external function generator source. But as per my NI 6363 card specification, it shoud work upto 2MHz sample rate

for single channel. I am using  one analog input & one analog output port by which i can see my real analog signal out in my oscilloscope.

I have attached my sample code previously for your reference, by where you can get my port channel configuration. If you have any idea, Kindly help me.

Wait for your kind response

regards

Gopal...

[GopalSarkar]

Need support ...

Wait for reply  ..