Noise analysis

[salvai.m]

Hi,

when I acquire a signal AC of my phonometer and I do a FFT I obtain a pulse of 80dB at 13600 Hz without noise in the room; the same problem succed when I disconnect the cable in input....So I think it's an electric noise...do you know which can be the source of this noise ??

Thank YOU

[Louis Manfredi]

Hi Salvai:

Welcome to the forum!

Do you know what the sampling rate of your system is? This might provide some clues about the apparent noise problem.

Any information you can provide about the hardware you are using, and copies of your collection and analysis program will also help us to help you.

Best Regards, Louis

[salvai.m]

Hi Luois, first thank you for the reply.

I'm using a 6070 multifunction board.

I acquire packet of 4100 samples;

Sampling rate: 500000 s/sec;

Scan rate: 41000 s/sec;

I use DIAdem DAC to acquire and analyze.

I'm not sure of this parameters also because I've see that if I change some of them the freq of the pulse change...

Thank you