Goal - To understand the time line cycle of the Meade Deep Sky Imager =
pro (DSIpro) Camera when used to collect images for time sensitive =
applications, ie The Pluto Occultation.

Equipment
-DSIpro fitted with a Pentax 28mm lens controlled by DELL laptop PC.
-KIWI OSD system consisting of PC164c video camera (NTSC), 6" monitor, =
KIWI OSD, GPS system to supply time standard, Canon Camcorder.
-Subject, a 12volt 1.3AH battery fitted with a Red LED, mounted on the =
bed of my lathe and the feed set as fast as it could go.

Method Summary
Setup the DSIpro camera and make 1 second exposures of a moving subject =
while at the same time video the activity with a time inserter equipment =
(KIWI OSD) and then correlate the two processes.

Method Details
1) the laptop's clock was synced by use of the internet feature of "date =
& time" control panel.
2) the KIWI OSD system was setup and a GPS fix was obtained.
3) the video camera was pointed at the laptop screen that was showing =
the date & time control panel and it was found that the laptop was 0.320 =
seconds slow to UTC
4) the DSIpro was setup to record 1 second exposures, saving all RAW =
frames, in FITS format, with combine images unchecked.
5) Both the DSIpro and the video camera were pointed at the subject and =
the Battery/LED assembly was fed along the bed of my lathe.=20
6) Inspect the frames. The first frame is effected by acceleration of =
the lathe and has been omitted.  The last frame is incomplete and has =
been omitted as well.  The middle two frames provide a good continuity.
7) look through the videotape to find the corresponding section and note =
the KIWI OSD display.

Analysis
1) The first scan shows 10:53:04UT in the FITS header.  The next scan is =
10:53:06 UT  Both these scans are assembled into one image, labeled and =
is attached to this email.
2) Inspection of the LED streak reveals that the accumulation of photons =
is not consistent over the duration of the exposure cycle.
2) A .mpg movie file also attached, is inspected and the interesting =
points of the exposure of the DSIpro can be estimated.
3) Analysis of the first scan and the movie reveal...
a) the 10:53:04 UT scan starts at 10:53:02.195UT and the LED leaves a =
wide trail to the right =20
b) the width of the streak varied in width and at 10:53:03.263UT the =
solid streak ends and changes to show only half of an interlaced field.
c) at 10:53:03.695 UT the exposure ends.
d) during the next 0.501 seconds the file is transferred and processed =
within the PC and in the last 0.196 seconds the header is created and =
the file written to disk.
e) at 10:54:04.196 the next exposure commences.

Conclusions.
The time given in the FITS Header is for the END of the =
exposure/download cycle
The exposure time is 1.5 seconds.
There is a dead time or image download time of 0.5 seconds