Vei046: Created page with "==Usage== The Threshold Scan is used to evaluate the threshold of the analog front-end of the ALPIDE Sensor. It configure the ALPIDE to have a threshold '''X'''. It then inj..."

2022-01-24T14:19:16Z

Created page with "==Usage== The Threshold Scan is used to evaluate the threshold of the analog front-end of the ALPIDE Sensor. It configure the ALPIDE to have a threshold '''X'''. It then inj..."

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==Usage==

The Threshold Scan is used to evaluate the threshold of the analog front-end of the ALPIDE Sensor. It configure the ALPIDE to have a threshold '''X'''. It then injects a charge '''C1''' ranging from 0-50 DAC units to see the response in the pixel-matrix. The threshold of a pixel is determined by when it starts to respond to the injected charge. The result is presented for the entire pixel-matrix, where the average of the pixel thresholds are calculated.

==How To==
To run the test navigate to the test folder

<syntaxhighlight lang="bash">
$ cd tests

$ python3 threholdscan.py --board=BOARD --tctype=TCTYPE --chips=CHIPS
</syntaxhighlight>

The test outputs a time-and-date.root file located in ''production_tests/results/''

This file is automatically analyzed when you run the thresholdscan.py script. The analysis script is located in ''production_tests/plot/''. A plot with the results from the test is provided and stored in ''production_tests/results/plots/''. The plot will have the following name threshold_scan_chip_id_{}.png
The result and classification is also provided in the terminal. The ALPIDE sensor can get '''GOLD, SILVER, BRONZE''' or '''NOK''' as a classification based on the result of the test.

The config file for the test is located in ''production_tests/config/''. The DAC Settings section can be edited in order to alter the performance of the ALPIDE. It is mainly the following settings which are of interest for the test: VCASN, ITHR, IDB, VRESETD.

Threshold Scan - Revision history

Vei046: Created page with "==Usage== The Threshold Scan is used to evaluate the threshold of the analog front-end of the ALPIDE Sensor. It configure the ALPIDE to have a threshold '''X'''. It then inj..."