Celestron CG-4 User Manual download pdf (Page 44)

FREQUENTLY ASKED QUESTIONS (FAQ’S)

7 FREQUENTLY ASKED QUESTIONS (FAQ’s)

The most frequently asked questions are listed below.

For an update, please refer to the Kipp & Zonen website:

http://www.kippzonen.com

1. What are typical values for downwelling atmospheric long wave

radiation?

Clouded sky

(Lnet = 0 W/m

)

Clear sky

(Lnet = -150 W/m

)

Ambient

temperature

in W/m

-20 °C 230 80

0 °C 315 165

+30 °C 480 330

2. The values calculated with the formula, given in chapter 4, show

a very strange value. What could be the reason?

- Check whether the (instrument) temperature (T

) is given in

Kelvin.

- Check that the net radiation (Uemf / S) is a negative value, if not,

the wires are possibly interchanged.

3. What is the primary entry point for humidity?

The desiccant cartridge and cable gland have equal chances to

transport some moisture, but also the silicon glue of the window is not

fully watertight. However,

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Celestron CG-4 User Manual Page 44