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: http://www.mrao.cam.ac.uk/~jsy1001/dimmwit/finder/userman.html
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...Using the window manager menu (COAST finders)User Interface Layout
...From an xterm (COAST finders)
...From an xterm (DIMMWITs)
File MenuThe Panel Controls and Indicators
View MenuOpen Config...
Save Config
Save as...
Data Parameters...
Connect Telescope
Disconnect Telescope
Exit
ToolbarCCD Menu
Statusbar
Tracking MenuConnect CCD
Disconnect CCD
Fullscreen
1D DIMM Mode
2D DIMM Mode
Transverse DIMM Mode
Help MenuSelect Target
Select Region
Subframe
Start Tracking
Stop Tracking
Manual Control
Save Movie
Stop Recording Movie
About...
CCD Readout
BinningVideo Display
Exposure
Clear Charge
Stretch ContrastStatus
Correct Gamma
Fast 1D Grid
Fast 2D Grid
Fast Trans Grid
Show Scale
X and Y Offset Signals
Telescope Secondary and Beam Splitter Status
Progress Bars
Status Bar
ssh coast@dimmwit finder
The single board computer at each telescope contains a configuration file that lists aspects of finder operation that are unique to that telescope. Finder running on each telescope configures itself according to this file. The contents of the file are described in more detail here .
Open Config...
The default file name is "finder.conf" but with this menu item the user can choose to load a different configuration as long as it has a " .conf" suffix.Saves the current configuration under the filename finder.conf . NOTE: If the crosshair position changes while finder is running, finder will automatically update finder.conf when quitting
Save Config
Save as...
Saves the current finder configuration under a new name. This might be useful if the user wants to record the current crosshair position before doing experiments where it will be temporarily changed.
Invokes the data file dialog, which tells finder (or DIMMWIT) how to save files when the "
Data Parameters... Shift+P
Save Movie " action (in the tracking menu) is chosen. The file format depends on whether finder or DIMMWIT is in 1D DIMM mode or not. Normally, the file is a 3D FITS file with the image stored in the x and y dimensions and successive images in time in the z dimension. In 1D DIMM mode, the file is a 2D FITS file with spatial information in x and successive snapshots in time in the y axis. See "
Save Movie " and "
1D DIMM Mode" for more information.
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In the file parameters section:
In the FITS parameters section:
- Under "Base file name" you can enter the path and file name you want to save files to. On COAST finders, the default directory is recommended as it is NFS mounted to oberon and has much higher capacity than the local silicon hard drive. On DIMMWITs you should choose a directory that is NFS mounted on your computer, again because the local silicon hard drive capacity is limited (information on how to NFS mount your computer's hard drive on DIMMWIT can be found here).
- If you choose "Insert date/time in filename when saving" the base filename you have specified above will have the current date and time (down to the millisecond) inserted. Hence even if you just keep pushing the "
" button over and over, each file you make will have a unique file name. Note that this option is forced on if you want to acquire more than one file on a single trigger.
- The "On trigger acquire" allows you to specify how many files to sequentially acquire and how many frames each one should have.
- This allows you to save up to 99 files sequentially without having to manually initialise the acquisition of each one.
- If you want a simple 2D FITS file, specify one file with one frame.
- Be aware that a frame can take several seconds to acquire if you are in full screen mode so a large series will take a while in that case.
- On the other hand, each image in the DIMM modes only takes a few milliseconds to acquire so you can take large numbers of frames.
- NOTE: The maximum number of frames in 1D DIMM mode is 131072 ( 217 ). In 2D and transverse mode it is 65536 (216). You do not have to remember these numbers, if you type in a larger number than 131072 it will be automatically reduced to this maximum and if you try to acquire a 2D DIMM file with more than 65536 frames you will be warned and the number will again be reduced to the allowed maximum.
- 131072 frames is just over 4 minutes 22 seconds in DIMM 1D mode, 65536 frames is just over 3 minutes 16 seconds in 2D DIMM mode.
- The "Acquire until stopped" item is deprecated and has been disabled.
- You can record a brief description in each of the fields provided or leave them at their default settings. This information will be written into a standard FITS header when finder saves the file.
(NOTE: This command will not work with DIMMWIT unless it is on the COAST network.)
Connect Telescope Shift+T
Connects this finder to the telescope controller via local ethernet. If the connection is successful the "Disconnect Telescope" menu item and button will become available, otherwise there will be an error dialog and you should refer to the troubleshooting guide for suggestions as to what to do next.
The telescope controller IP address and the port number to use are determined by the configuration file . The port number is important because the telescope controller uses it to distinguish which finder it is talking to. The appropriate port numbers are here . It is important to get the port number right, as it is otherwise possible to have a finder feeding signals back to a different telescope!
NOTE: If finder can't find or does not understand its configuration file, it will default to port 2700 (the centre telescope). So if a finder is unexpectedly communicating with the centre telescope, look for a missing or broken finder.conf.Disconnects finder from the telescope controller. If finder is connected to the telescope controller and the latter program forces disconnection (for example, by quitting), finder now also disconnects gracefully .
Disconnect Telescope Shift+D
Exit Ctrl+Q
Quits finder. If the configuration has changed (new crosshair position) finder will inform you before exiting.
NOTE: Finder is reasonably robust when told to quit unexpectedly while connected to everything and tracking. However, it is best not to tempt fate and to shut it down gracefully:
- Click on the "
" to disconnect from the telescope.
- Click on the "
" to disconnect from the CCD.
- Select "Exit" from the "File" menu.
Toolbar
Hides/shows part of the toolbar. Of limited use.
Statusbar
Turns status messages (at the bottom of the display) on/off.
Connects finder to the CCD controller. If all is well, readout will begin immediately. If not, you will be informed and should refer to the troubleshooting guide for ways to rectify the problem.
Connect CCD Ctrl+C
NOTE: If the camera head does not have power (for example, a telescope beam splitter is out) the display will remain dark.
Disconnects finder from the CCD controller. If you try to quit finder before doing this you will see an error message asking you to disconnect first.
Disconnect CCD Ctrl+D
Causes finder to start reading out the entire CCD. The following operations are cancelled if they were running:
Fullscreen Ctrl+F
This is a good button to press if something has gone wrong, as all feedback is cancelled and the entire field of the CCD is displayed.
- Subframing.
- Tracking.
- Either DIMM mode.
Initiates high speed CCD readout in a way that is suitable for one-dimensional DIMM measurements.
1D DIMM Mode Alt+1
1D DIMM mode tries to maximise readout rate for seeing measurements:
Note:
- Readout is initiated by a periodic USB interrupt to the microcontroller.
- Firstly, 64 lines of CCD charge are clocked into one line, the readout register.
- Secondly, 64 pixels from the readout register are each clocked out and digitised.
- The results from the readout are sent to the single board computer over the USB link.
- The cycle repeats every two milliseconds.
- The result is spatial information in the horizontal dimension at 500Hz.
- Because there is no charge clearing, charge produced anywhere on the CCD will eventually be read out. Hence:
- There are many 64x64 regions on the CCD besides the corner that are also useful.
- These regions are marked out when the "Fast 1D Grid " check box is ticked.
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1D DIMM mode also differs from normal readout in other ways:
Dropouts in acquisition files can occur if acquisition is disturbed. Hence:
- The display changes to display the 64 pixel line of charge.
- Most controls are disabled.
- 1D DIMM mode can be stopped by selecting "
Fullscreen".
- Selecting "
Save Movie" produces a 2D "strip chart" FITS file:
- The horizontal dimension is spatial.
- The vertical is time in 2ms increments.
- Up to four minutes of data can be saved.
- Data is saved in finder computer memory and saved to file after the event.
- Don't move the mouse or interact with the display in any way while saving movies.
Initiates high speed CCD readout in a way that is suitable for two-dimensional DIMM measurements.
2D DIMM Mode Alt+2
NOTE: This mode works with both MX516 and HX516 cameras whether they have had the the hardware modification described above or not.
2D DIMM mode tries to maximise readout rate for seeing measurements: