[Halld-pid] [New Logentry] TOF PMT TDC response

[Fernando J Barbosa]

On 3/9/2015 12:20 PM, Fernando J Barbosa wrote:
> Hi Sasha, Beni,
>
> I took some measurements on a spare splitter which is well matched to 
> the coax cables and there are no reflections. Reflections are possible 
> if the devices (fADC250, Discriminator, Splitter) have been 
> incorrectly assembled.
>
>
>
> Best regards,
> Fernando
>
>
>
> On 3/6/2015 1:52 PM, Beni Zihlmann wrote:
>> When the DAQ starts the discriminator values are set according to the
>> values in the
>> configuration file. Currently for the TOF the threshold for the
>> discriminators in
>> the configuration file are set to 30 and 50 for the TDC and Trigger
>> outputs respectively.
>>
>> The only time you have to worry is when the DAQ is not running, then
>> anything can happen.
>>
>> cheers,
>> Beni
>>> OK. Except that the epics scaler program was (re)started couple of hours
>>> after crate reboot, resetting thresholds from DAQ-configured 30
>>> back to 100 and leading to sudden change in rates which I began to monitor
>>> since reboot. I'm worried that this can happen again, only in the middle of
>>> the data run this time (DAQ sets thresholds to 30). Somehow, the threshold
>>> setting of DAQ and epics scalers should be in better sync with each other
>>> to avoid making mess of thresholds and rate monitoring (or one
>>> of them shouldn't reinitialize discriminators at all).
>>>
>>> Sasha
>>>
>>> On Friday, March 06, 2015, Beni Zihlmann wrote:
>>>> Hi Sasha,
>>>>
>>>> every time the crate gets rebooted the discriminator thresholds are set
>>>> to a default value of 100 by the scaler program that is started after
>>>> the boot
>>>> by the cron job.
>>>>
>>>> if you want to change the threshold you have to do that yourself using a
>>>> program.
>>>> If you do not have such a program I can provide you one.
>>>>
>>>> cheers,
>>>> Beni
>>>>
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>
>
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