FFT resolution problem

Hello,

I have a question regarding FFT analysis.

Currently, I am acquiring 1000Hz acceleration data from 9 sensors. According to the software manual and website information, the resolution is specified as "resolution = (sample rate / 2) / number of lines." However, the minimum resolution within the software is fixed at 0.4 Hz, and even after changing the settings under "Settings - Performance," the same warning message is displayed.

I would like to set the resolution to at least 0.01 Hz. Could you please help me with this?

Thank you.

Hello,

thank you for reaching out to us.

At your current settings, the equation is as follows:

resolution = (1000 Hz/2)/1250 = 0.4 Hz

Since you are working with the Dynamic sample rate of 1 kHz, and would like to calculate low frequencies, the software is giving you a warning to increase the Sync DB buffer length.

To measure at 0.01 Hz, you can either increase the sync DB buffer so that the warning no longer appears (I would suggest you increase the buffer size in increments). This will increase the number of the lines you are working with:

Or you can modify the Dynamic sample rate:

At this point, I would like to mention, that, while higher buffer settings are used when we are working with large math calculations, it is recommended that the buffer lengths are set to be as low as possible, because you might experience memory and performance issues otherwise. Besides that, lower DB buffer allows for faster calculations.

Best regards,

Pika

@Pika Kreča Šmid

Hi,

thanks for your feedback!