Joseph M Gwinn wrote: > Bruce, > > > [email protected] wrote on 12/11/2008 08:36:47 PM: > > >> Joe >> >> Attached is noise spectrum (1kHz and below) of AP192 with nothing >> connected to inputs. >> Sampling rate 96KSPS. >> Frequency bin equivalent noise bandwidth ~ 3Hz. >> Noise has similar spectrum to flicker noise with a noise corner of >> around 300Hz or so. >> > > The noise floor ain't so bad, -130 dB (dBm? dbV?) at maybe 10 Hz, even if > it's 20 dB worse than at 1 KHz. > > Has anyone measured the Allan Deviation? > > Joe > > > Joe
Noise plot is with respect to full scale (4Vrms). I need to build a noise source to check the absolute level. Will use the amplified Johnson noise of a 150K resistor. By Allan deviation do you mean calculate it from the sequential 96KSPS ADC output samples? I can do this, but since the dominant noise source is white the Allan deviation will scale with the measurement bandwidth. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
