Filter Wheel Setup and Uses

This is just the standard filter wheel setup used on the Canadian Brewer Spectrophotometer Network. Other networks may differ

	Filter Wheel 1				Filter Wheel 2
Position	Steps	Attenuation	Filter	Notes	Steps	Filter	Notes
0	320	FP	Film Polarizer	0	0	Clear
1	256	2.0	GQD2	Used for most measurements	64	0.5	ND1
2	192	3.0	ND6	Not used (Future Autosighting?)	128	1	ND2
3	128	0	Clear	Used during FZ, FM	192	1.5	ND3
4	64	4.5	GDQ2+2.5	Not Used	256	2.0	ND4
5	0	1.7	GDQ1	Used for DT/RS Measurement*	320	2.5	ND5

In order to use Position 5 in filter wheel one in DT/RS, this must be enabled in IC Enter IC, and go down to “Second film polarizer” and press [key]h[/key]. This will change the name to “FW1@5 for DTRS” The Canadian Brewer Spectrophotometer Network has done this achieve higher counts during DT/RS test. The ideal counts for DT is 3 million counts on the high intensity and 1 million counts on the low intensity. For RS we are aiming for 1 million counts for best results.

Shown below is the expected DI for filter wheel 1