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On 3/9/2015 12:20 PM, Fernando J Barbosa wrote:<br>
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<div class="moz-cite-prefix">Hi Sasha, Beni,<br>
<br>
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.<br>
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<img src="cid:part2.04000104.04020609@jlab.org" alt=""><br>
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Best regards,<br>
Fernando<br>
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On 3/6/2015 1:52 PM, Beni Zihlmann wrote:<br>
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<pre wrap="">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
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<pre wrap="">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:
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<pre wrap="">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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