QHYCCD QHY600, Руководство пользователя

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QHY600
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operating system. If the pause time is too long, the buffer with small storage capacity in the USB will
be full, resulting in the loss of the upcoming data. It is also possible to cause partial data loss of one
frame to form a bad frame. For short exposures, this may not cause too much problems, but for long
exposures, this means losing a long exposure image. The
1GB
（
8Gbit
）
/ 2GB
（
16Gbit
）
DDR3 buffer solves this problem by storing and transmitting the entire frame of images. Even if the
USB transfer is paused for a long time, no data will be lost.
Another advantage is that when using some computers that are not running fast or have poor support
for USB3.0, it will make the video images more delicate and smooth. These computers can't transfer
high-speed data well, and the data will often be lost. With DDR. A buffer that buffers a lot of image
data and sends it to the computer. Even if USB 3.0 frequently suspends transmission, it will ensure
that data is not lost. There are options in SharpCap to turn DDR buffering on or off. The current version
of the ASCOM driver has been working in DDR mode.
4. How to protect the refrigerator?
The QHY600's chiller can achieve an ambient t
emperature difference of nearly 35 °C. You should
avoid thermal shock during use. The so-called thermal shock refers to the internal strong stress that
the refrigerator has to withstand due to the thermal expansion and contraction principle when the
temperature of the refrigerator suddenly rises or falls. The thermal shock of the distance shortens the
life of the refrigerator. Even completely damage the refrigerator.
Therefore, when you start using the chiller to adjust the CMOS temperature, you should avoid turning
the chiller to maximum power and gradually increase the chiller power. If the power of the chiller is
high before disconnecting the power supply, you should also gradually reduce the power of the chiller
and then disconnect the power supply.
5. Horizontal banding Optimize
It is a common behavior for CMOS sensor which contains some horizontal banding. Normally speaking
the random horizontal banding can be removed with multiple frame stacking so it will not effect the
image. The periodic horizontal banding cannot be removed with stacking so it will bring some problem
for the image. For QHY600, by adjust the USB traffic in both Single Frame mode and Live Frame
mode, you can adjust the frequency point of the CMOS sensor driver and it can optimize the horizontal
banding appeared on the image. This optimized is very effective to remove the periodic banding in
some conditions.
A typical Periodic Horizontal Noise under certain USB_TRAFFIC value