TDC calibration

run# 8742: delay dt=59 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

run# 8736: delay dt=100 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

run# 8737: delay dt=200 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

The mean of the peak is at 165.5 channel

run# 8738: delay dt=300 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

The mean of the peak is at 335.7 channel

run# 8739: delay dt=400 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

The effect of multiple pulsing appeared at this point. It should be fixed before the production runs start.

The mean of the peak is at 511.5 channel

run# 8740: delay dt=800 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

The mean of the "main" peak is at 1197 channel

run# 8741: delay dt=1000 ns between the rise side of the common start pulse and the fall side of the fake stop signal.

The data look like:

The mean of the "main" peak is at 1548 channel

Calibration procedure summary

Delay between fall sides of start/stop, ns	Average TDC ch #
100	165.5
200	335.7
300	511.5
700	1197
900	1548

TDC calibration plot:

regression line fit y = 1.724728814 x - 7.940677966

The TDC calibration is [math]\frac{dt}{ch}= \frac{1}{slope}=\frac{1}{1.7245}=0.5798\frac{ns}{ch}[/math]