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The grating characteristics are:
- Grating rest position.
- This is the position of the grating mechanism
when no power is applied to the drive coils. The grating is returned to
this position at the end of each measurement with the grating in order
to minimize the popwer input to the ISO cryostat.
- Grating scan range
- The set of positions over which the Grating may be
moved is limited by the design of the mechanism (the range of the
mounting pivot movement). The Grating Scan range defines this set
of positions to be those for which the drive current is less than
12 mA.
- Grating spectral element
- This is the Full Width Half Maximum of the of
the instrument spectral response, in the Grating Mode, to an unresolved
spectral line. It determines the resolving power of the instrument in
medium resolution observations.
N.Trams, ISO Science Operations Team
Using inputs from:
C.Gry, T. Lim, LWS Instrument Dedicated Team
A.Harwood, P.E.Clegg, B.Swinyard, K.King, LWS Instrument Team
S.Lord, S.Unger, IPAC.