[subexp-daq] Question on NURDLIB - what is 'pedestal'?

[Hans Toshihide Törnqvist]

Dear all,

All correct, but I should add that this has so far only been a 
nice-to-have feature which nobody else has touched as far as I know. I 
would not rely on it for anything other than having fun trying to revive 
it, or to clean up the festering v7nn code.

Cheers,
Hans

On 2024-04-23 19:06, Håkan T Johansson wrote:
> 
> Dear Günter,
> 
> that ought to be for ADCs or QDCs.  On the trigger they typically 
> convert all channels.  But most are just noise.  Then the storage of 
> values only happens if they are above the threshold.
> 
> It is sometimes convenient to set those cut thresholds automatically. 
> That requires knowing that some triggers happen randomly, and thus 
> should only by chance be associated with 'non-noise' data.  With the 
> auto-pedestal setting, such noise data would be collected and analysed 
> (mean and std.dev.), and then a threshold setting is calculated a few 
> sigma above.  I think the name pedestal would refer to the mean value of 
> the noise as such.
> 
> The analysis presumably happens once-in-a-while, and might also warn if 
> the pedestals change more than some std.dev. fraction.
> 
> I hope Hans will fill in more details if needed (and tell if I'm 
> completely off).
> 
> Cheers,
> Håkan
> 
> 
> 
> On Tue, 23 Apr 2024, Weber, Guenter Dr. wrote:
> 
>>
>> Dear friends,
>>
>>
>> I came across 'pedestal' in module V7nn (while trying to implement the
>> missing 16 channel module 785N into NURDLIB). Is there an easy 
>> explanation
>> what this is?
>>
>>
>>
>>
>> Thank you very much!
>>
>>
>>
>>
>> Best greetings
>>
>> Günter
>>
>>
>>
>>
>