[Rich] Note on H8500 average dark current

[Matthias Hoek]

Hi Marco,
That is true if you base the total noise rate on an individual MAPMT's noise rate. However, if you assume the noise to be uncorrelated then you have a much higher noise rate (because you have 28 MAPMTs). Then a 15ns window would be sufficient, so the truth must be in between. 
How do you get the 100ns time window for the DAQ?

Cheers,

	Matthias

-----Original Message-----
From: mirazita [mailto:Marco.Mirazita at lnf.infn.it] 
Sent: 15 April 2013 12:39
To: Matthias Hoek
Cc: rich at jlab.org
Subject: Re: [Rich] Note on H8500 average dark current

Hi Matthias,
as far as I remember, the time window of our daq was 100 ns, so a factor of 3 smaller then what you calculated.
Marco



On Sun, 14 Apr 2013 21:50:05 +0100, Matthias Hoek <Matthias.Hoek at glasgow.ac.uk> wrote:
> Hi,
> I mentioned a brief note concerning the H8500 average dark current 
> properties during our last phone meeting. Please find this note
attached. I
> hope you find it useful.
> 
> Cheers,
> 
>                 Matthias
> 
> ---
> 
> Dr Matthias Hoek
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