I have read all the explanations, done the tests, tried many combinations but have failed to find the right settings that minimise the waiting time in ACP when the object I am imaging crosses the Meridian. I am part of a survey consortium looking at particular stars for up to four hours per night total time using a repeating sequence that takes up to five minutes to cycle through. No individual exposure is longer than 2 minutes. Needless to say it's very difficult to avoid going through the Meridian with such a long dwell time on a single target.
The minimum delay time ACP inserts is about 40minutes when crossing the Meridian and no exposures are done during this time. I have set the ACP flip points at zero (flip at the Meridian) and the Track Past at 50min with a 5min assurance time. I know from testing that the DDM85 will slew to 200min past the Meridian without flipping but I cannot use this as the OTA hits the pier in some configurations.
So, I obviously have failed to grasp what ACP, AutoSlew, and the DDM85 are doing at the Meridian with my repeated exposure configuration. Can someone suggest a set of parameters that will reduce the waiting time? And why these work?
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wemartin
I have read all the explanations, done the tests, tried many combinations but have failed to find the right settings that minimise the waiting time in ACP when the object I am imaging crosses the Meridian. I am part of a survey consortium looking at particular stars for up to four hours per night total time using a repeating sequence that takes up to five minutes to cycle through. No individual exposure is longer than 2 minutes. Needless to say it's very difficult to avoid going through the Meridian with such a long dwell time on a single target.
The minimum delay time ACP inserts is about 40minutes when crossing the Meridian and no exposures are done during this time. I have set the ACP flip points at zero (flip at the Meridian) and the Track Past at 50min with a 5min assurance time. I know from testing that the DDM85 will slew to 200min past the Meridian without flipping but I cannot use this as the OTA hits the pier in some configurations.
So, I obviously have failed to grasp what ACP, AutoSlew, and the DDM85 are doing at the Meridian with my repeated exposure configuration. Can someone suggest a set of parameters that will reduce the waiting time? And why these work?
Bill
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