One or more detectors do not read out or the Data Taking Package is frozen

If all the detectors read out, then everything is working and you are good to proceed with your observations.

If one or more of the detectors still do not read out or the SCP or DTP freezes, the next step is to try running the detector reset script.

In the event want to only reset one or two of the detectors. You can specify which detectors are reset by modifying the script as follows:

Open ~/igrins_admin/igm_rcv.py in a text editor
On line 33 it should say,
ers = [’S’,’H’,’K’]
The list ers tells the script which detectors to reset. Here all three detectors will be reset. Comment out line 33 and below set ers equal to what detectors you want to reset.
For example, if the SCP was freezing but the DTP still showed the H and K band dectors reading out, you only would want to reset the slit-view camera detector, so comment out line 33 of ~/igrins_admin/igm_rcv.py and below it add ers = [’S’] as follows:
#ers = [’S’,’H’,’K’]
ers = [’S’]
ATTENTION: If you in anyway unsure what the above means, it is safest for you to leave the ~/igrins_admin/igm_rcv.py file alone and continue onto the next steps.

Next try running the detector reset script as following:

Close the SCP and DTP if you have not already done so. If one or both are frozen, use the ICS Hub → Kill Processes to close them.
Open a terminal
cd ~/igrins_admin
source run_det_restart.sh
Put in the igrins password used to log into the Instrument Control Computer.
Wait a minute while it runs.
If you see nothing but a bunch of zeros scrolling by for a few minutes, the script did not work and you will need to press control c to kill the script and then proceed to the instructions for power cycling the detector controllers below.
If the script works, when it is finished reopen the SCP and DTP.
Take a single + test exposures to confirm all three detectors read out.
If everything works, and you modified ~/igrins_admin/igm_rcv.py, be sure to undo any changes you made to ~/igrins_admin/igm_rcv.py by setting line 33 back to just and deleting anything you added below that line:
ers = [’S’,’H’,’K’]

Note: Resetting the H-band detector can leave a strong electronic signal on the detector that looks like a bright column. It will slowly fades away over time. Take a 30 second test exposure to see if it is there. You might want to wait 10-20 minutes before continuing observations to allow time for most of the signal to fade away.

If running the detector restart script does not resolve the issue, you will need to power cycle the detector readout electronics controllers. Do the following:

Move the telescope to Zenith.
Raise the east platform enough you can access the IGRINS electronics rack mounted to the side of IGRINS.
If you see the backside of the IGRINS electronics rack, you will find three power switches for three detector controllers, as shown in the attached photo.
Turn all three switches off
Wait about 10 seconds.
Turn all of them back on.
Lower the east platform back to the ground.
Go back to the control room and on the Instrument Control Computer do the following to run the detector restart script…
Close the SCP and DTP (if they are open). If one or both are frozen, Use ICS Hub → Check Processes to kill them.
Open a terminal
cd ~/igrins_admin
source run_det_restart.sh
Put in the igrins password used to log into the Instrument Control Computer.
Wait a minute while it runs.
When it is finished reopen the SCP and DTP.
Take a single and test exposures to confirm everything works.
If everything works, and you modified ~/igrins_admin/igm_rcv.py, be sure to undo any changes you made to ~/igrins_admin/igm_rcv.py by setting line 33 back to just and deleting anything you added below that line:
ers = [’S’,’H’,’K’]

Hopefully this will get everything running correctly and you can proceed with your observations. If not, try contacting an IGRINS Team Member for help.

Note: Again be aware that restarting the H band detector can leave a bright column of signal, that will slowly fade away. Consider waiting 10-20 minutes before (re)starting observations to allow time for it to fade. After that, any residual signal should be weak enough to subtract out during the data reduction process.