Plot
? |
Symb
? |
Source
* |
OPS?
** |
Average ? |
Thresholds ? |
N_
data |
QC1
parameter |
Data
downloads |
Remarks |
| method |
value |
unit |
method |
value |
| 1 |
• | QC1DB |
yes (0) |
MEDIAN |
7258.08057 |
counts |
VAL | 2000,19000 |
25 |
mean_raw |
this |
last_yr |
all
|
flat field level, L543.1 setting; Medusa1 |
| 2 |
+ | QC1DB |
yes (0) |
MEDIAN |
7164.24756 |
counts |
VAL | 2000,19000 |
27 |
mean_raw |
this |
last_yr |
all
|
as plot 1, Medusa2 |
| 4 |
[7] | QC1DB |
yes (0) |
MEDIAN |
8082.06934 |
counts |
VAL | 3000,24000 |
12 |
mean_raw |
this |
last_yr |
all
|
as plot 1, IFU1 |
| 5 |
[20] | QC1DB |
yes (1) |
MEDIAN |
8396.35449 |
counts |
VAL | 3000,24000 |
11 |
mean_raw |
this |
last_yr |
all
|
as plot 1, IFU2 |
| 6 |
• | QC1DB |
yes (0) |
MEDIAN |
5994.37793 |
counts |
VAL | 3000,24000 |
14 |
mean_raw |
this |
last_yr |
all
|
as plot 1, Argus |
| |
|
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: to indicate that OPSLOG data are included
|
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 the L543.1
HC flat data only.
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.
Check the other plots of this group for data from any measured flat
field, sorted over time ("ALL") or over wavelength ("per WLN").
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 plot.
In the same way, the IFU flats require
about 3000 ADUs on average.
The upper limit is derived from the saturation limit.
General information
Click on any of the plots to see a close-up version.
If applicable, the latest values from Paranal ops logs are plotted as blue dots. More information about those values, including a download option, is available in the OPSLOG section on top of the page.
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
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