<p> A late entry for the work I carried out on Thursday.</p>
<p>With the Emco box providing the HV, the pulser peak showed double (or triple) peaks. This was not seen with the SY1527 so I thought this would be better for looking at peak widths.</p>
<p>Same ASIC settings my previous entry, and a HV of 200V with leakage current 3.8uA.</p>
<p>I varied the shaping time in each module using the ASIC4 control page as this also changes the hold time automatically. Slow comparitor threshold of 64.</p>
<p>Checked each module and took sample channels from a couple of ASICs in each but made qualitative comparisons with random channels in all ASICs to make sure the chosen ones were representative of the ASIC/module as a whole.</p>
<p>Tables and graphs are included below for nnaida11 and 13. nnaida13 showed a high level of low E noise on some spectra, but the pulser peaks were always well defined single peaks.</p>
<p>nnaida12 showed noises across the full range of many spectra in all ASICs apart from ASIC4. Patrick suggested this module may possibly be suffering and need replacing. A quick scan through some channels showed:</p>
<ul>
<li>average peak width @ shaoing time of 0.5us of ~150-180 ch</li>
<li>same at shaping times of 2.5 and 4.5us. Noise present over full range throughout</li>
</ul>
<p>My taxi was arriving so I didn't have chance to go through nnaida14 in depth, but a quick scan showed peak widths within ~10-15ch of those seen in nnaida13.</p> |