Re: 3032vs4022 self-noise, HDP2vsDR680 input noise

["Paul Jacobson" thebrunswicktwitcher]

On 29/05/2010, at 11:31 AM, Rob Danielson wrote:
> Hi Paul--
> Paul did other takes with the 3032's->DR-680 he could look at for 
> recurrence.  Are you getting it to show in a sonogram we can send 
> him?  If not, I guess we'll have to see if "tinkling" in the DR680 or 
> in combination with the 3032 shows up again. Rob D.


Hi Rob,

I've had a mess around and after bandpassing +10Khz I've been able to get a 
clear sonogram of the noise.  There is a rapid ticking noise occurring 20 times 
per second. The broadband nature of the noise might indicate a source 
originating in the test environment. This ticking isn't apparent in the HDP2 
portion of the test as can be seen from the sonogram. 

http://demo.mactrix.com.au/dr680/Bandpass_DR680.wav

http://demo.mactrix.com.au/dr680/DR680-HDP2_transition.png

http://demo.mactrix.com.au/dr680/DR680_3032_flicker-noise.png

cheers
Paul