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| Switching gain mode | AHL-H | AHL-L | AML-M | AML-L |
|---|---|---|---|---|
| pedestal H(M)-from dark, L-evaluated | 3332 | 1825 | 3295 | 2601 |
| offset (B) from fit | 4584 | 3077 | 3679 | 2985 |
| offset (B) difference H(M)-L | 1507 | 694 | ||
| gain (G) from fit | 47 | 0.52 | 15.4 | 0.49 |
Denote
- p - pedestal
- B - fit base-level offset parameter, <intensityADU> = B + G * <event-index-from-0-pulser>
- G - gain
Current (plots above and results in table) naive version of L-pedestals evaluation
- pL = pH - (BH-BL)
Possible correction for difference between B and pGabriel's version
- pL = pH BL - (BH-BL) + (BH-pH)*GL/GH,
last term accounts for the difference between B and p in H- and L-gain modes, where
- p - pedestal
- B - fit base-level offset parameter
- G - gain
- this correction increase pedestals ~0.5-0.7%
Gabriel's version
- pL = BL - (BH-pH)*GL/GH
L-pedestals using Gabriel's formulae for AHL-L and AML-L
Questions
- do we need to account for the difference between offset (B) and pedestal (Gabriel's version)
- the same difference may be between fit B(L) and pedestal(L) OR it is smaller due to the gain?
- is current procedure correct?
- if not
- what is correct procedure?
- or what could we calibrate with charge injection?
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