TDC calibration

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

Dt 100ns 8742 pic.jpg


The data look like:

R8742 tdc.jpg


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

Dt 100ns 8736 pic.jpg


The data look like:

R8736 tdc.jpg

Looking at the data it can be concluded that TDC measures the time difference between the fall side of the start signal and the fall side of the stop signal.

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


Dt 200ns 8737 pic.jpg


The data look like:

R8737 tdc.jpg

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.

R8738 tdc.jpg


The data look like:

Dt 300ns 8738 pic.jpg

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:

Dt 400ns 8739 pic.jpg

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:

Dt 800ns 8740 pic.jpg

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:

Dt 1000ns 8741 pic.jpg

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]

Calibration plot.png