1. Select LowRes15 from Grat iconFOR LONG SLIT (PRISM MODE)
Grat pop-up menu2. Select slit (0.3,0.5,0.8,1.6 or 3.0 x 15arcsec)
12. Use 'cal_prism_xx' macros.
Set cal_prism to any of these values
1. Select LowRes60 from Grat icon
Grat LowRes60 option2. Select slit (0.3,0.5,0.8,1.6 or 3.0 x 60arcsec)
12. Use 'cal_prism_xx' macros, where xx is the slit width.
The procedure is as for B. except: 1. Select LongXD 1.9-4.2um from Grat icon
Grat LongXD 1.9-4.2 option8&9. As 8&9 for procedure A. except that the ITIME is usually limited by the bright sky background at 4 microns. Also, because the sky is effectively more variable at thermal wavelengths, nods to sky should be done about once every 30sec. 12. Use 'cal_lxd_1.9_xx' macros, where xx is the slit width. cal lxd 1.9 options
The procedure is as for B. except: 1. Select LongXD 2.3-5.5um from Grat icon
Long Single Order
The procedure is as for B. except: 1. Select Short Single Order 0.9-2.5um from Grat icon
Short Single Order
1. Select Long Single Order 3.1-5.5um from Grat icon
Long Single Order
2. Select slit (0.3,0.5,0.8 x 60arcsec) In this mode the maximum slit width is limited to 0.8arsec to avoid saturating on the flat field lamps. If this is a problem it may be possible to increase the array well-depth by changing the array bias voltage. This may only be done after consultation with your support astronomer.
Desired slit sizes
4. Select desired order sorting filter in OS Flt (Long4, L5 or L6)
Long OS Flt options
7. Start guiding in Guidedog XUI '(see IR Guiding)' or with the off-axis visible guider. IR guiding must done through the order sorting filter in the OS Flt wheel.
12. Use corresponding XD macro for calibration. (Eg. for L5 and 0.5 arcsec slit use 'cal_lxd_1.9_0.5' macro.