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  Are you suspicious that your A/D converter may have a stuck bit? This problem is described in detail in the Massey & Jacoby CCD Data: The Good, the Bad, and the Ugly reprint, found in many domes. The ramp exposure gives us the opportunity for sampling many data values in a single exposure: the shutter is opened, and the chip is read down while still exposing to light. We are still in the process of experimenting with this new feature, and future versions of this manual will provide some diagnostic examples.
Tue Feb 14 07:48:00 MST 1995