Difference between revisions of "CDC 19 12 2007"
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Thanks to Fernando we have a new reference measurement; he measured the noise of the interposer+preAmp+signal cable: his measurement is shown in figure 1. | Thanks to Fernando we have a new reference measurement; he measured the noise of the interposer+preAmp+signal cable: his measurement is shown in figure 1. | ||
| + | [[Image:interposer-preAmp-signalcable_noise_fernando.jpg|thumb|none|400px|figure 1: interposer+preAMp+signal-cable (taken from Fernando's report) (x-y divisions: 20 ns - 20 mV).]] | ||
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| + | The differential signal was measured with the cable between the CDC-straw-wire and the HV-distribution board disconnected on the CDC side. The measured signal is shown in figure 2. | ||
| + | [[Image:HV-board-preAmp-signal_cable_CDCdis2.jpg|thumb|none|400px|figure 2: HV-board+preAmp+signalcable signal (pink) with cable between CDC and HV distribution board disconnected on the CDC side.]] | ||
| + | No oscillations are observed! If one compares to figure 1 the comparison is reasonable, but I think Fernando has a better oscilloscope! | ||
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| + | For the sake of completeness, the cable between the CDC and the HV distribution board was also disconnected on the side of the HV-board, this signal can be seen in figure 3. | ||
| + | [[Image:HV-board-preAmp-signal_cable_HVDdis2.jpg|thumb|none|400px|figure 3: HV-board+preAmp+signalcable signal (pink) with cable between CDC and HV distribution board disconnected on the HV distribution board side.]] | ||
| + | Again, no oscillations. | ||
| + | |||
| + | Conclusion: the oscillations are caused by the input signals on the preAmp | ||
Revision as of 19:47, 12 December 2007
Interposer, preAmp, and signal cable
This is the continuation of CDC_12_12_2007.
Thanks to Fernando we have a new reference measurement; he measured the noise of the interposer+preAmp+signal cable: his measurement is shown in figure 1.
The differential signal was measured with the cable between the CDC-straw-wire and the HV-distribution board disconnected on the CDC side. The measured signal is shown in figure 2.
No oscillations are observed! If one compares to figure 1 the comparison is reasonable, but I think Fernando has a better oscilloscope!
For the sake of completeness, the cable between the CDC and the HV distribution board was also disconnected on the side of the HV-board, this signal can be seen in figure 3.
Again, no oscillations.
Conclusion: the oscillations are caused by the input signals on the preAmp
