FORS1 trending system: HISTORY plot
Last update: 2007-03-08T13:56:48 (UT)
same group: med_mast_H ron_raw_H ron_mast_H fp_raw_H struct_raw_H
close window history: 2005   2006   2007   HEALTH
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Plot Symbol
[info]		 Source* Average [info] Thresholds [info] N_data Data downloads Remarks
method value unit method value
1 •QC1DB MEDIAN0.214 ADU 3SIG± 0.292 23 this | last_yr | all 4port readout (Garching)
2 •QC1DB MEDIAN0.258 ADU 3SIG± 0.335 26 this | last_yr | all 4port readout (Garching)
4 •QC1DB MEDIAN0.304 ADU 3SIG± 0.235 14 this | last_yr | all 4port readout (Garching)
5 •QC1DB MEDIAN0.304 ADU 3SIG± 0.297 24 this | last_yr | all 4port readout (Garching)
6 •QC1DB MEDIAN0.090 ADU 3SIG± 0.133 12 this | last_yr | all 1port readout (Paranal)
3 xQC1DB MEDIAN11.200 ADU 3SIG± 10.866 157 this | last_yr | all Temperature at Instrument Focus
*Data sources: OPSLOG: Paranal ops logs; QC1DB: QC1 database; LOCAL: local text file
This plot

The difference between the first raw bias and the second raw bias (in ADU) shifted by 10x10 pixels, is computed (per port). This is the combination of fixed pattern noise and read out noise (scaled by sqrt(2)). The population standard deviation of this difference is computed and divided by the square root of 2. The read out noise contribution evaluated as QC OUTi RON is then quadratically subtracted from the total noise.  

General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
  • you can download the data for each parameter set if the 'Data downloads' link shows up