Analog inputs using NI USB-6259 screw terminal

[Jarrah]

I am using USB-6259 screw terminal to acquire Analog input voltage signal, the acquired signal is from channel is noisy, how can I filter it. by the way my original signal is pure DC voltage signal without noise. The noise comes from the DAQ device.

[Henrik_Volkers]

Use a differential configuration , use shielded twisted pair cable as short as possible.

Sample 60ms with highest possible samplerate and look at the noise. Make FFT of the signal and look at it.

Some noise can come from the DAQ .. How is your setup?