Tests 1 and 2 below should be done each time the setup is moved or significantly reconfigured, though in the future only one or two long integration time FDI scans would likely be required to confirm the absence of light leakage.

1. Check for dark (background) light leakage This tests leaks in the camera housing, the camera shutter is closed through out. The sphere source should be turned on because it is a source of ambient light. The fibers are uncapped but stuck into the tube, the curtains down, the room lights off
1. Light sources off, all Fibers darked, Image sequence: BI images only
2. Take 10 BI images @ 600 second integration time (check the first scan for leaks before proceeding with the full set) Integration time is called Exposure time on the camera software
3. Take 10 BI images @ 0.1 second integration time
4. Analysis
1. Check the BI images (1b) for light leaks
2. Images from 1b. are offset + dark current + any light leaks
3. Images from step 1c. are offset + dark current (zero for short integration times) + leaks (also zero for short Integration times)
4. 1b - 1c should show a non-spectral shift to higher ADU for the longer integration time images
5. (1b – 1c )/Int time = dark current for CCD @ -75 C

Confirm no light leakage before proceeding. Light leakage here would be from light leaks in the camera housing