Plot
[info] |
Symbol
[info] |
Source* |
OPS?** |
Average [info] |
Thresholds [info] |
N_data |
Data downloads |
Remarks |
| method |
value |
unit |
method |
value |
| 1 |
• | QC1DB |
yes (18) |
MEDIAN |
194.00000 |
ADU |
3SIG | ± 3.36490 |
63 |
this |
last_yr |
all
|
Q2, median bias, low gain |
| 2 |
• | QC1DB |
yes (18) |
MEDIAN |
196.00000 |
ADU |
3SIG | ± 1.50269 |
63 |
this |
last_yr |
all
|
Q1, median bias, low gain |
| 3 |
• | QC1DB |
yes (18) |
MEDIAN |
188.00000 |
ADU |
3SIG | ± 8.73813 |
63 |
this |
last_yr |
all
|
Q2, median bias, high gain |
| 4 |
• | QC1DB |
yes (19) |
MEDIAN |
194.00000 |
ADU |
3SIG | ± 2.30507 |
63 |
this |
last_yr |
all
|
Q1, median bias, high gain |
| 5 |
• | QC1DB |
yes (18) |
MEDIAN |
199.00000 |
ADU |
3SIG | ± 3.07809 |
63 |
this |
last_yr |
all
|
Q3, median bias, low gain |
| 6 |
• | QC1DB |
yes (18) |
MEDIAN |
193.00000 |
ADU |
3SIG | ± 1.70389 |
63 |
this |
last_yr |
all
|
Q4, median bias, low gain |
| 7 |
• | QC1DB |
yes (18) |
MEDIAN |
200.00000 |
ADU |
3SIG | ± 9.80078 |
63 |
this |
last_yr |
all
|
Q3, median bias, high gain |
| 8 |
• | QC1DB |
yes (18) |
MEDIAN |
194.00000 |
ADU |
3SIG | ± 2.63178 |
63 |
this |
last_yr |
all
|
Q4, median bias, high gain |
|
|
|
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: to indicate if OPSLOG data are included
|
This plot
Trending plots for bias QC parameters.
All bias parameters are measured in the central 1600x1800 pixels of the
detectors. The median bias level and the rms of the master should show a
stable trend without sudden jumps or increase/decrease. The read-out
noise is calculated from the difference of the first two raw frames.
Some outliers with high values are occasionally observed due to cosmic
ray events.
Bias frames are usually measured daily during day-time. They come in two
different varieties: with low gain (used for imaging) and with high gain (used
to calibrate the spectroscopic modes).
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
|
