Differences

This shows you the differences between two versions of the page.

--- on_sky_testing [2026/02/04 22:18] – 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====
@@ Line 5: / Line 20: @@
 Spectrograph refocussed. Images look more circular in middle of chip at lower focus values, but extracted images show more variation in resolution at the lower values.
-Images ffrom 433000 to 438000 in steps of 1000 near center of chip.
+Images from 433000 (left) to 438000 (right) in steps of 1000 near center of chip:
 {{:test:specfoc_433000_438000.png?direct&400}}
 Extracted FWHM/Resolution from the same sequence:
-|{{:test:specfoc_433000.png?direct&400}}|{{:test:specfoc_434000.png?direct&400}}|{{:test:specfoc_435000.png?direct&400}}|{{:test:specfoc_436000.png?direct&400}}|{{:test:specfoc_437000.png?direct&400}}|{{:test:specfoc_438000.png?direct&400}}|
+|{{:test:specfoc_433000.png?direct&250}}|{{:test:specfoc_434000.png?direct&250}}|{{:test:specfoc_435000.png?direct&250}}|{{:test:specfoc_436000.png?direct&250}}|{{:test:specfoc_437000.png?direct&250}}|{{:test:specfoc_438000.png?direct&250}}|
+Not overly satisfying, but adopted 437000.
 ====Guiding tests====