European Southern Observatory New Technology Telescope

General :
Observations :
Operations :

Procedure Change in
Grating Housing Exchange

At the end of the grating housing exchange procedure :

• DO NOT ANY MORE DISABLE THE grtr FUNCTION :
  this unfortunately prevents Echelle name to be written into image headers:
  the emmi config panel will put the grtr function in simulation when mounting Echelle#10 or #14
  and reset it for all other gratings including #9. No other precaution is necessary.
• For the time being (from june 2003 on) do not connect anymore
  the motor and encoder cables to the Echelle dummy connectors!
  They produce antenna read out noise on CCD.
  
  

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