Difference between revisions of "Pedestal"
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| + | ====Pedestal mean==== | ||
Pedestal mean (channels) vs time - each point is an average of 1000 events | Pedestal mean (channels) vs time - each point is an average of 1000 events | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="480pt"|[[Image:pedestal_mean_1-1450V.jpg|thumb|none|480px|Pedestal mean - 1450V - half ADC range (ch 4096 ~ 0.5V)]] |
| + | |width="480pt"|[[Image:pedestal_mean_2-1450V.jpg|thumb|none|480px|Pedestal mean - 1450V - half ADC range (ch 4096 ~ 0.5V)]] | ||
|} | |} | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="480pt"|[[Image:pedestal_mean_3-1450V.jpg|thumb|none|480px|Pedestal mean - 1450V - half ADC range (ch 4096 ~ 0.5V)]] |
| + | |width="480pt"|[[Image:pedestal_mean_4-1450V.jpg|thumb|none|480px|Pedestal mean - 1450V - half ADC range (ch 4096 ~ 0.5V)]] | ||
|} | |} | ||
| − | + | ====Pedestal sigma==== | |
| − | + | Pedestal sigma (channels) vs time - each point is an average of 1000 events | |
| − | + | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="480pt"|[[Image:pedestal_sigma_1-1450V.jpg|thumb|none|480px|Pedestal sigma - 1450V - half ADC range (ch 4096 ~ 0.5V)]] |
| + | |width="480pt"|[[Image:pedestal_sigma_2-1450V.jpg|thumb|none|480px|Pedestal sigma - 1450V - half ADC range (ch 4096 ~ 0.5V)]] | ||
|} | |} | ||
| − | |||
| − | |||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="480pt"|[[Image:pedestal_sigma_3-1450V.jpg|thumb|none|480px|Pedestal sigma - 1450V - half ADC range (ch 4096 ~ 0.5V)]] |
| + | |width="480pt"|[[Image:pedestal_sigma_4-1450V.jpg|thumb|none|480px|Pedestal sigma - 1450V - half ADC range (ch 4096 ~ 0.5V)]] | ||
|} | |} | ||
| + | ====Just one event==== | ||
| + | Pedestal for one event | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="960pt"|[[Image:pedestal_event_1.jpg|thumb|none|960px|Pedestal for one event]] |
|} | |} | ||
| + | Pedestal for one event - switched channels 1 and 15 between shaper and ADC | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="960pt"|[[Image:pedestal_event_switched_1_15.jpg|thumb|none|960px|Pedestal for one event]] |
|} | |} | ||
| + | This shows that switching ADC contributes about 100ch to the difference in pedestal. | ||
| + | ====One event, different preamps==== | ||
| + | To see if the largest and smallest pedestals are correlated with the shaper channels. All the plots use the same scale, x-axis is time, from 0-4096, each bin is 8ns, and y-axis is channels from 0 - 1024, the ADC max is 4096 but the pedestals were all below 800ch. | ||
{| border="1" cellpadding="2" | {| border="1" cellpadding="2" | ||
| − | |width=" | + | |width="960pt"|[[Image:pedestal_event_diff_preamps.jpg|thumb|none|960px|Pedestal for one event, preamps 3 and 4, ADC half range]] |
|} | |} | ||
Latest revision as of 10:28, 16 July 2010
Pedestal mean
Pedestal mean (channels) vs time - each point is an average of 1000 events
Pedestal sigma
Pedestal sigma (channels) vs time - each point is an average of 1000 events
Just one event
Pedestal for one event
Pedestal for one event - switched channels 1 and 15 between shaper and ADC
This shows that switching ADC contributes about 100ch to the difference in pedestal.
One event, different preamps
To see if the largest and smallest pedestals are correlated with the shaper channels. All the plots use the same scale, x-axis is time, from 0-4096, each bin is 8ns, and y-axis is channels from 0 - 1024, the ADC max is 4096 but the pedestals were all below 800ch.
