Difference between revisions of "CDC 20 02 2008"
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[[Image:injshapergood.jpg|thumb|none|400px|figure 1.3: Shaper in(blue)/output(green) when injecting a signal in a good channel.]] | [[Image:injshapergood.jpg|thumb|none|400px|figure 1.3: Shaper in(blue)/output(green) when injecting a signal in a good channel.]] | ||
[[Image:injshaperbad.jpg|thumb|none|400px|figure 1.4: Shaper in(blue)/output(green) when injecting a signal in a bad channel.]] | [[Image:injshaperbad.jpg|thumb|none|400px|figure 1.4: Shaper in(blue)/output(green) when injecting a signal in a bad channel.]] | ||
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| + | == CDC HVB version 3 == | ||
| + | Can be downloaded here: | ||
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| + | [[media:cdcpcbv3.tgz|cdcpcbv3.tgz]] | ||
Revision as of 18:16, 12 February 2008
Shaper board
The 16 channel cable preAmp - shaper board arrived today at CMU. Time to take data. After connecting the the cable to the shaper board some problem showed up. Channel 1-2-3 (starting from 0) showed a gain that is a factor of 10 lower than the other channels. Worrisome is that before this behavior already showed up in channel 2 (1 month ago) but after reconnecting the cable it disappeared. Also now, sometimes channel 2 recovers but channel 1 and 3 always stay at the low gain. I saved some scope traces and I believe they are pointing towards a problem close to the 3M connector.
In figure 1.1 a CDC signal can be seen in a good channel (channel 0) in figure 1.2 a CDC signal is shown in a bad channel (ch. 3), notice the difference in the vertical scale.
When injecting a signal in the shaper board no problem is visible. Injecting happens in a different input connector than the 3M one. In figure 1.3 and 1.4 one can see this for a good and bad channel respectively.
CDC HVB version 3
Can be downloaded here:
