I am using USB 6255 data acquisition board. The cutoff frequency of the internal low pass filter is 1.7 MHz, therefore, the background noise with frequencies below 1.7 MHz cannot be eliminated. The multiple channel signals I am measuring have 10 KHz frequency and the amplitude from 2 mV to 20 mV, but the accurate measurement cannot be achieved even I set the AI measurement range is 100 mV. Could you please guide me to add a extra analogue or digital low pass filter and keep the fast response time if possible? Thank you.
Are you using LabVIEW to record your acquisition? If so you can use our 'Filter express vi' to achieve this. The configuration window is shown below:
Let me know if this helps,