Differences

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

--- en:ost:telescope:probleme [2021/12/07 16:43] – rhainich
+++ en:ost:telescope:probleme [2026/01/15 14:51] (current) – [Resolved problems that should no longer occur] rhainich
@@ Line 170: / Line 170: @@
 ===== Telescope: =====
+==== Focuser of the CDK20 does not run the complete range of ~35000μ ====
+<WRAP group>
+<WRAP twothirds column>
+**Problem description:**
+PWI3 shows clearly negative position values when driving in or the focuser does not run in the positive range (when driving out) up to the maximum ~35000μ.
+**Solution:**
+The focuser has "swallowed" and the encoder delivers wrong values. This can be fixed by clicking on ''Home'' (see picture) in the Focuser tab of PWI3 under ''Find Home and Reset'' and then on ''YES''. This will reset the focuser and reinitialize the home position, restoring the normal focus range.
+</WRAP>
+<WRAP third column>
+{{ ost:software:pwi3_homing_focuser.png }}
+</WRAP>
+</WRAP>
 ==== Wobbling Camera/spectrograph ====
@@ Line 218: / Line 232: @@
 **Solution:**
-The cameras' interior is not in a vacuum and moisture can get in, causing icing on the cooled CCD chip. To prevent this, the cameras have dry cartouches with desiccants. If icing appears, the cartouches need to be regenerated ([[en:ost:telescope:setup#ccd_cameras|see this article]]). During that observational night, wait for approximately one hour until the ice sublimates from the CCD chip.
+The cameras' interior is not in a vacuum and moisture can get in, causing icing on the cooled CCD chip. To prevent this, the cameras have dry cartouches with desiccants. If icing appears, the cartouches need to be regenerated ([[en:ost:ccds:grunddaten#maintenance|see this article]]). During that observational night, wait for approximately one hour until the ice sublimates from the CCD chip.
 ==== ST-8: shutter error ====
@@ Line 252: / Line 266: @@
 **Solution:**
-The filter wheel needs to be reinitialized. The corresponding menu can be found via //Filter// and //Filter Setup//. Select the "FW-5" filter wheel from the drop down menu and confirm the settings with a click on the //OK// button. Afterwards the filter wheel should work again.
+The filter wheel needs to be reinitialized. The corresponding menu can be found via ''Filter'' and ''Filter Setup''. Select the "FW-5" filter wheel from the drop down menu and confirm the settings with a click on the ''OK'' button. Afterwards the filter wheel should work again.
@@ Line 273: / Line 287: @@
 [{{:ost:telescope:tracking_error.png?900|Tracking errors of a globular cluster (M 13, left panels) and an open cluster (right panels)}}]
+/*
 [{{https://polaris.astro.physik.uni-potsdam.de/ftp/tracking_error/animation_20140515_5s.gif?550&nocache|300 exposures of NGC 6819 at intervals of 5 seconds, dated 15 May 2014}}]
 [{{https://polaris.astro.physik.uni-potsdam.de/ftp/tracking_error/animation_20140808_NGC6819_5s.gif?550&nocache|201 exposures of NGC 6819 at intervals of 5 seconds, dated 8 August 2014, after calibration of the [[en:ost:telescope:setup#a-PEC|Periodic Error Control]]}}]
 [{{https://polaris.astro.physik.uni-potsdam.de/ftp/tracking_error/animation_20140515_1s.gif?550&nocache|300 exposures of NGC 6819 at intervals of 1 second, dated 15 May 2014}}]
 [{{https://polaris.astro.physik.uni-potsdam.de/ftp/tracking_error/animation_20140808_NGC6819_1s.gif?550&nocache|805 exposures of NGC 6819 at intervals of 1 second, dated 8 August 2014, after calibration of the [[en:ost:telescope:setup#a-PEC|Periodic Error Control]]}}]
+*/
 ++++