Difference between revisions of "CDC old & new preamp noise scope trace study"
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|width="415pt"|[[Image:signal_beni_2000.jpg|thumb|none|400px|Beni's old preamp - 2000V - cosmic ray]] | |width="415pt"|[[Image:signal_beni_2000.jpg|thumb|none|400px|Beni's old preamp - 2000V - cosmic ray]] | ||
|width="415pt"|[[Image:signal naomi_2000.jpg|thumb|none|400px|Naomi's new preamp - 2000V - cosmic ray]] | |width="415pt"|[[Image:signal naomi_2000.jpg|thumb|none|400px|Naomi's new preamp - 2000V - cosmic ray]] | ||
| + | |} | ||
| + | |||
| + | |||
| + | OK, so far so good. Let's switch the HV off and look at the ringing: the highest amplitude ringing was selected, | ||
| + | so you are looking at the high end of the pedestal: | ||
| + | |||
| + | <b>Channel 1</b> | ||
| + | {| border="1" cellpadding="2" | ||
| + | |width="415pt"|[[Image:ringing_yves_ch1.jpg|thumb|none|400px|Yves' old preamp - ch1 - ringing]] | ||
| + | |width="415pt"|[[Image:ringing_beni_ch1.jpg|thumb|none|400px|Beni's old preamp - ch1 - ringing]] | ||
| + | |width="415pt"|[[Image:ringing naomi_ch1.jpg|thumb|none|400px|Naomi's new preamp - ch1 - ringing]] | ||
|} | |} | ||
Revision as of 14:58, 30 June 2010
A study was performed using three preAmps:
- Yves' old preAmp : the old preamp that changed behavior a month ago
- Beni's old preAmp: the old preamp used before by Beni.
- Naomi's preAmp : the new preAmp.
Left is always Yves' old preAmp, middle is Beni's old preAmp, right is Naomi's new preAmp
First 2000V was put on the chamber and a random cosmic ray signal was selected:
OK, so far so good. Let's switch the HV off and look at the ringing: the highest amplitude ringing was selected,
so you are looking at the high end of the pedestal:
Channel 1
