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--- on_sky_testing [2026/02/04 22:33] – 10.253.229.157
+++ on_sky_testing [2026/04/24 19:54] (current) – holtz
@@ Line 1: / Line 1: @@
+====April 2026====
+A new iodine cell was installed.
+We implemented a shutter in the direct calibration channel.
+We got the repaired liquid cooled CCD back from QHY and installed it, along with the TCube Edge chiller.
+When revisiting spectrograph focus, the Esatto focuser would intermittently time out. As a result, it's uncertain whether the reported focus position is repeatable, e.g., after homing the focuser. Given potential repeatability issues, the focuser was just moved until acceptable images were reached, which is at a currently reported value of 398000. After settling on that, the Esattor focuser was powered off through the Wanderer PowerBox to remove the light source. A final image at this focus is UT260424/specfoc.0035.fits. 2D profiles for 5 ThAr lines, and 1D FWHM are as follows:
+{{:test:UT260424_focus2d.png?direct&400}}
+{{:test:UT260424_focus1d.png?direct&400}}
 ====November 2025====