Difference between revisions of "CDC old & new preamp noise scope trace study"
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|width="415pt"|[[Image:ringing naomi_ch15.jpg|thumb|none|400px|Naomi's new preamp - ch15 - ringing]] | |width="415pt"|[[Image:ringing naomi_ch15.jpg|thumb|none|400px|Naomi's new preamp - ch15 - ringing]] | ||
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| + | The old preAmp has higher amplitude noise in chip2 -> channels 9-16 | ||
| + | The new preamp has lower amplitude ringing compared to the old preAmp. | ||
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| + | Now it comes: remember the wierd noise peaks: | ||
Revision as of 15:07, 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
Channel 8
Channel 9
Channel 15 <- This channel is always used for Fe-55 measurements
The old preAmp has higher amplitude noise in chip2 -> channels 9-16 The new preamp has lower amplitude ringing compared to the old preAmp.
Now it comes: remember the wierd noise peaks:
