PMT response curves are not always linear.
This has an effect on both the pulse height and integral. Moreover the HiSPARC electronics have ADCs which only go to -2 V. Larger signals are saturated. We need to account for these effects.
Old power supplies:
New power supplies:
As can be seen the old power supply barely reaches 2 V, this differs from PMT to PMT, and may be influenced by the high voltage on the PMT. This means the signals are unlikely to reach the saturation threshold of the HiSPARC ADCs, this can easily be checked for detectors in the pulse height histograms. Saturated signals may require more effort to reconstruct.
Todo:
- Account for ADC saturation
- Account for non-linearity
- Check pulse height versus pulse integral (if linear -> new pmt)
- Check maximum pulse height
PMT response curves are not always linear.
This has an effect on both the pulse height and integral. Moreover the HiSPARC electronics have ADCs which only go to -2 V. Larger signals are saturated. We need to account for these effects.
Old power supplies:
New power supplies:
As can be seen the old power supply barely reaches 2 V, this differs from PMT to PMT, and may be influenced by the high voltage on the PMT. This means the signals are unlikely to reach the saturation threshold of the HiSPARC ADCs, this can easily be checked for detectors in the pulse height histograms. Saturated signals may require more effort to reconstruct.
Todo: