The first number is the sensed temperature of the CCD chip. The second is the sensed temperature of the case. Both are in degrees C. The last is the amount of power required to maintain the temperature.

Getting to and staying at 100% is not good because the temperature is basically uncontrollable at that point.

The physics of the situation is that the heat removed from the CCD chip (to make it cold) must be dissipated. This will raise the case temperature. I have fonud that as long as you keep the power number less than 80% the system works fine. However, if after the initial cool down (where the power used is 100%) the power ever gets back above 80%, then the system becomes unstable, in that in trying to cool, it needs to dissipate more heat which raises the case temperature which means it needs to increase cooling power to dissipate more heat which raises the case temperature which..... until it gets to 100% power.


My rule of thumb is that when you first power up the unit and connect to it, the set temperature for the CCD should be no colder than 30 degrees C less than the initial case temperature.

Ralph




Edward Registrato wrote:

> I am running Pictor ver 6.45. There are numbers at the bottom of the
> screen. Can anyone tell me what they mean?
>
> They read:
>
> a few mins later they read:
>
> a few mins later they read:
>
> and a few mins later they read:
>
> I would like to know what I am reading and could not find my book as a
> reference. I recognize there is some significance to these readings.
>
> Thanks
>
> ED REGISTRATO

View index by [date] [author] [subject]
Previous message: Re: [M]: apparent field of view, Henry Pfizenmayer
Next message: [M]: runaway R.A., Mantra E Books
Next message in thread: RE: [M]: pictor numbers, Edward Registrato
Previous message in thread: [M]: pictor numbers, Edward Registrato