Difference between revisions of "TDC calibration"
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| − | '''run# 8742''': delay dt=59 ns between the | + | '''run# 8742''': delay dt=59 ns between the rise side of the common start pulse and the fall side of the fake stop signal. |
[[File:dt_100ns_8742_pic.jpg | 500 px]] | [[File:dt_100ns_8742_pic.jpg | 500 px]] | ||
| Line 10: | Line 10: | ||
| − | '''run# 8736''': delay dt=100 ns between the | + | '''run# 8736''': delay dt=100 ns between the rise side of the common start pulse and the fall side of the fake stop signal. |
[[File:dt_100ns_8736_pic.jpg | 500 px]] | [[File:dt_100ns_8736_pic.jpg | 500 px]] | ||
| Line 19: | Line 19: | ||
[[File:r8736_tdc.jpg | 500 px]] | [[File:r8736_tdc.jpg | 500 px]] | ||
| − | + | ||
| − | '''run# 8737''': delay dt=200 ns between the | + | '''run# 8737''': delay dt=200 ns between the rise side of the common start pulse and the fall side of the fake stop signal. |
| Line 32: | Line 32: | ||
The mean of the peak is at 165.5 channel | The mean of the peak is at 165.5 channel | ||
| − | '''run# 8738''': delay dt=300 ns between the | + | 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# 8738''': delay dt=300 ns between the rise side of the common start pulse and the fall side of the fake stop signal. | ||
[[File:r8738_tdc.jpg | 500 px]] | [[File:r8738_tdc.jpg | 500 px]] | ||
| Line 44: | Line 47: | ||
| − | '''run# 8739''': delay dt=400 ns between the | + | '''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 data look like: | ||
[[File:dt_400ns_8739_pic.jpg| 500 px]] | [[File:dt_400ns_8739_pic.jpg| 500 px]] | ||
| + | |||
| + | 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 | The mean of the peak is at 511.5 channel | ||
| − | '''run# 8740''': delay dt=800 ns between the | + | '''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 data look like: | ||
| Line 60: | Line 66: | ||
The mean of the "main" peak is at 1197 channel | The mean of the "main" peak is at 1197 channel | ||
| − | '''run# 8741''': delay dt=1000 ns between the | + | '''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 data look like: | ||
| Line 67: | Line 73: | ||
The mean of the "main" peak is at 1548 channel | The mean of the "main" peak is at 1548 channel | ||
| + | |||
| + | '''Calibration procedure summary''' | ||
{| border="1" | {| border="1" | ||
| − | | Delay, ns || Average TDC ch # | + | | Delay between fall sides of start/stop, ns || Average TDC ch # |
|- | |- | ||
| 100 || 165.5 | | 100 || 165.5 | ||
| Line 85: | Line 93: | ||
regression line fit '''y = 1.724728814 x - 7.940677966''' | 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> | ||
[[File:calibration_plot.png | 500 px]] | [[File:calibration_plot.png | 500 px]] | ||
Latest revision as of 15:24, 19 March 2015
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
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# 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
