From Tim Hardy

[Preben Noerregaard]

Hi Tim

This is the flushing mode we are using as standard on our
Loral 2k3eb's. All serials, SW, OG and RG are held  high during
the parallel clocking.

It is true that,  especially at high flat levels, there may be remaining 
charge is the image. For this reason we run the parallels typically 
10-20% more than the length of the parallel (2200 cycles for a 2kx2k)
and complete the procedure with a similar sweep of the serial reg. 

The potential barrier between the serial and up to the parallel may
be too weak on your TK512, so it simply doesn't work on your CCD.

Cheers, Preben
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Preben Noerregaard
Copenhagen University Observatory
Juliane Maries Vej 30,  DK 2100 Copenhagen O
Tel: +45 35 32 59 44, Fax: +45 35 32 59 89
email: preben at astro.ku.dk
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