QHYCCD QHY8L - Manual (Page 10)

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About controlling for BLOOMING
QHY8L CCD chip have the -100dB anti-
overflow foundation. Anti-overflow capacity is
slightly lower than QHY8L of-100dB. So there is
possible to overflow for shooting very bright target.
For the overflow problem of SONY CCD chip,
please install mechanical shutter to solve. If
mechanical shutter is indeed necessary, please
consult QHYCCD or your area dealer.
Protection of Cooler
The double cooler of QHY8L can reach to 33-35
Centigrade difference in environmental
temperature. So need to avoid thermal shock.
Thermal shock means internal stress of cooler
happen to change due to expansion or
contraction caused by the rapid changes in
temperature of cooler. Strong thermal shock will
shorten use age of cooler or even irreparable
defect of cooler.
The method of avoiding thermal shock is this: To
avoid reaching maximum power of cooler when
booting machine. Ensure to increase gradually
power of cooler. When stopping machine work ,
after reduce gradually power of cooler shutdown
and turn off the power of machine.