Missing data points in CCD QA plots

[kadglass]

Some of the CCDs are missing their data points on the CCD QA plots (e.g., r1-CD, r4-AB,...). Segev suggested this might be due to missing calibration darks that are raising errors in qproc.

[daqiii]

yes, the controls for these ccds were tweaked yesterday and we need new darks for them. Klaus Get Outlook for iOS<https://aka.ms/o0ukef>

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________________________________ From: Kelly Douglass ***@***.***> Sent: Friday, August 16, 2024 12:30:43 AM To: desihub/nightwatch ***@***.***> Cc: Subscribed ***@***.***> Subject: [desihub/nightwatch] Missing data points in CCD QA plots (Issue #426) Some of the CCDs are missing their data points on the CCD QA plots (e. g. , r1-CD, r4-AB,. . . ). Segev suggested this might be due to missing calibration darks that are raising errors in qproc. — Reply to this email directly, view it on GitHub, Some of the CCDs are missing their data points on the CCD QA plots (e.g., r1-CD, r4-AB,...). Segev suggested this might be due to missing calibration darks that are raising errors in qproc. — Reply to this email directly, view it on GitHub<https://urldefense.com/v3/__https://github.com/desihub/nightwatch/issues/426__;!!KGKeukY!yiHQccBZT3nlG4NlzFwo8gj35_C4YMinpMf6Ythity1Qn6POQgkb_kzKRRi_nuqkYDYS4VYEck2-Iv4RvxxTryKc2A$>, or unsubscribe<https://urldefense.com/v3/__https://github.com/notifications/unsubscribe-auth/ABQ5P64VIZIGEMJPIFGLF7LZRV57HAVCNFSM6AAAAABMTLRUOKVHI2DSMVQWIX3LMV43ASLTON2WKOZSGQ3DSNBUGU3DQMQ__;!!KGKeukY!yiHQccBZT3nlG4NlzFwo8gj35_C4YMinpMf6Ythity1Qn6POQgkb_kzKRRi_nuqkYDYS4VYEck2-Iv4RvxzscL37tw$>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[sybenzvi]

Looking further: this is more serious than I thought as several amps (e.g., r1c and r1d) have been missing readnoise, bias, and cosmic rates since the start of April. If this was raised in the nightlog, I missed it before now. Next steps:

• Identify cameras and spectrographs with missing QA plots (it looks like amps in r1, r4, r6, r7, z3, z7 are affected)
• Regenerate the QA files for the affected amps
• Update Nightwatch so it is visually obvious when data are missing

[kadglass]

Luke pointed out that some of the CCDs are now in 2-amp mode, which could be these "missing" data points. The conversion from 4- to 2-amp mode started in April, so the timing appears to coincide with the above comment. Perhaps all that's needed, then, is an update to Nightwatch to switch the ones in 2-amp mode to only have AB options (or something similar).

[sybenzvi]

Of course. Duh!

Rather than change the plots, I'll probably just add a note to the page so that observers (and I) don't get tripped up on this in the future.