CCAS DMI focus Curve Test v1

The purpose of this test is to determine the best stacking DMI position to give the smallest stack size at a given temperatures. Thus the winds can not be to high and the temperature should not change by more than about 1.5 C during the test.

Procedure:

• Stack the mirror as usual to get your mirror prepped for quick stacks
• Turn off the DMIFocus option in AOA software
• Move the focus to the starting DMI position (for winter probably 26.2115, summer 26.210)
• To measure the DMI position go to the DMI on the VNC and zoom in on the plot until you can get a good DMI value out to 5 digits
• Stack at the starting position (2 times on each side but end always on the same side)
• Run a measurement curve on the HEFI.
• Record: DMI value, EE50, EE80, HEFI focus, MARS focus, Tout, Tdome, Ttruss, Wind dir, Wind speed, UT time
• move +300 in focus and repeat
• Test ends when you pass through a minimum stack size (should be better than 0.5") and reach stack minimum of greater than 0.8".