Plot ? |
Symb ? |
Source * |
Average ? |
Thresholds ? |
N_ data |
QC1 parameter |
Data downloads |
Remarks |
method |
value |
unit |
method |
value |
1 |
| QC1DB |
none |
|
counts |
VAL | 2000,19000 |
87 |
mean_raw |
this |
last_yr |
all
|
Flat field level, all Medusa1 settings, 'Normal' read mode only |
1 |
| QC1DB |
none |
|
counts |
none | |
48 |
mean_raw |
this |
last_yr |
all
|
L543.1 only (for reference) |
2 |
+ | QC1DB |
none |
|
counts |
VAL | 2000,19000 |
86 |
mean_raw |
this |
last_yr |
all
|
as plot 1, Medusa2 |
2 |
+ | QC1DB |
none |
|
counts |
none | |
44 |
mean_raw |
this |
last_yr |
all
|
L543.1 only (for reference) |
4 |
∗ | QC1DB |
none |
|
counts |
VAL | 2000,24000 |
16 |
mean_raw |
this |
last_yr |
all
|
as plot 1, IFU1 |
4 |
∗ | QC1DB |
none |
|
counts |
none | |
13 |
mean_raw |
this |
last_yr |
all
|
L543.1 only (for reference) |
5 |
▲ | QC1DB |
none |
|
counts |
VAL | 2000,24000 |
18 |
mean_raw |
this |
last_yr |
all
|
as plot 1, IFU2 |
5 |
▲ | QC1DB |
none |
|
counts |
none | |
13 |
mean_raw |
this |
last_yr |
all
|
L543.1 only (for reference) |
6 |
| QC1DB |
none |
|
counts |
VAL | 2000,24000 |
39 |
mean_raw |
this |
last_yr |
all
|
as plot 1, Argus |
6 |
| QC1DB |
none |
|
counts |
none | |
17 |
mean_raw |
this |
last_yr |
all
|
L543.1 only (for reference) |
|
*Data sources: QC1DB: QC1 database; LOCAL: local data source
|
Plot 1 scores: 8|
| data source: | giraffe_flat (QC1 database) |
dataset: (numbers below apply to this dataset) | mean_raw | |
average: | none |
fixed thresholds: | 2000...19000 | counts |
N_data plotted: | 87 |
[click plot for closeup] |
Plot 2 scores: 8|
| data source: | giraffe_flat (QC1 database) |
dataset: (numbers below apply to this dataset) | mean_raw | + |
average: | none |
fixed thresholds: | 2000...19000 | counts |
N_data plotted: | 86 |
[click plot for closeup] |
Plot 4 scores: 1|
| data source: | giraffe_flat (QC1 database) |
dataset: (numbers below apply to this dataset) | mean_raw | ∗ |
average: | none |
fixed thresholds: | 2000...24000 | counts |
N_data plotted: | 16 |
[click plot for closeup] |
Plot 5 scores: 2|
| data source: | giraffe_flat (QC1 database) |
dataset: (numbers below apply to this dataset) | mean_raw | ▲ |
average: | none |
fixed thresholds: | 2000...24000 | counts |
N_data plotted: | 18 |
[click plot for closeup] |
Plot 6 scores: 1|
| data source: | giraffe_flat (QC1 database) |
dataset: (numbers below apply to this dataset) | mean_raw | |
average: | none |
fixed thresholds: | 2000...24000 | counts |
N_data plotted: | 39 |
[click plot for closeup] |
This plot
This is the Health Check plot for the signal level in the GIRAFFE
flat field calibration data. We display the QC1 parameter mean_raw
(QC.OUT1.MEAN.RAW) of the first input raw frame. This plot monitors all
setups for the 'normal' read mode. Check the "per_WLN" plot for the same data set, plotted over
wavelength.
The purpose of this plot is to guarantee that
all flat field calibration data have an exposure level which is good enough
to record the pixel-to-pixel gain variations.
For reference, the data from the Health Check setting L543.1 are highlighted.
You can study them separately in the "HEALTH" plot of this group.
Data from other read modes ('Slow' and 'Fast') are not trended here. These setups are rarely
used and the trending plots would be sparsely populated.
The data are checked against upper and lower limits. The lower limit is the
most important one. From the CCD trending plot
(no. 1), it follows that a single flat must have a minimum flux level of
roughly 20.000 ADU at the fibre peak, in order to be dominated by the
pixel-to-pixel gain pattern rather than by photon noise. From the topology of
the flat frame
signal, it follows a corresponding mean_raw value of about 7000 ADU. Assuming
three input flats creating a single master fiber flat, we derive an
approximate lower limit of 2000 ADU. This value is marked as lower threshold
in the plots.
In the same way, the IFU flats require
about 3000 ADUs on average.
The upper limit is derived from the saturation limit.
Note: All blue setups (below about 400 nm) may score red since their mean raw flux is rather low, often
below the thresholds.
This is usually not an issue since it is compensated by an increased number of raw files.
General information
Click on any of the plots to see a close-up version.
The latest date is indicated on top of the plot.
If configured,
- data points belonging to the latest date are specially marked
- 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
|