The FP etalon is a delicate instrument, particularly sensitive
to humidity and temperature variations. Troubles could come from the fact
that the FP has lost the settings of the parallelism, in that case you
have to reinitialize the CS100 or from the control room
by clicking on "reset" in the bottom of
the "reductor focal" window or by doing directly the reset at the CS100.
You may also check the connexions between the CS100 and the FP.
Also for a calibration lamp exposition, do not forget
to put the mirror on and to remove it when you want to do an observation.
Also think to check if the right calibration lamp is
on and if the right filter is in position.
References
Fabry Perot Interferometry Vaughan
Manual de Instalacion del PUMA R. Langarica, A. Bernal,
M. Rosado, F. Cobos, F. Garfias, L. Gutie Cobos, F. Garfias, L. Gutierrez, C. Tejada,
S. Tinoco, MU-97-02 September 1997, UNAM technical publication.
El PUMA: un espectrografo nebular para el estudio de la
cinematica de galaxias y del medio interestelar M. Rosado,
A. Bernal, R. Langaria, F. Cobos, F. Garfias, L. Gutierrez, C. Tejada,
S. Tinoco, E. Lecoarer in Memorias
Sommet XII Congreso de Instrumentacion, Ed Sociedad Mexicana de Instrumentacion
Sept 1997 p 390.
MOS/SIS Fabry Perot mode, CFHT User's Manual, Martin & Arsenaud