High Resolution Echelle Spectrometer     Technical Page

Summary

• Cross-disperser won't stop moving
• Shutter appears to fail

Cross-disperser won't stop moving

Symptom

When a cross disperser move is requested, the XDANGL keyword starts changing and never stops; it cycles continuously within a certain range of values.

Problem

The cross disperser motor is confused.

Solution

1. From the window manager's pulldown menu, select the HIRES Control Menu option, then release on the item labeled Stop Cross-disperser Oscillation.
2. Alternatively, type the following command on lehoula:

   stop_cd_drift

3. If this does not halt the cross-disperser, contact your support astronomer.

Shutter appears to fail

Symptom

During a non-dark, exposure the color-coded box on the expose GUI stays black indicating a closed shutter.

Problem

From what we can tell so far (Sep 2006) the shutter is actually opening, but somehow the switch is not quite making so that the software thinks it is closed.

Solution

No solution needed, unless the exposure level implies that the shutter really was closed. This is something we have never seen happen (Sep 2006).

Contacts at Keck for HIRES are     (primary),     (secondary).