Celestron CG-4 User Manual download pdf (Page 29)

INSTALLATION

3.3 ELECTRICAL CONNECTION

The CG 4 is provided with a 10 m, 6 wire shielded cable (8 wire for the

Pt-100 version). The following colour code is used:

Red : Plus thermopile

Blue : Minus thermopile

White : Case

Black : Shield

Thermistor

Yellow

Green

Pt-100 (optional)

Yellow : Pt 100 (combined with brown)

Brown : Pt 100 (combined with yellow)

Green : Pt 100 (combined with grey)

Grey : Pt 100 (combined with green)

A surge arrester is installed to lead off induced lightning currents to

the case. It is recommended to ground the case for this reason. The

surge arrester is noble gas filled, has infinite impedance and recovers

after breakdown. Breakdown voltage is 90 V. Peak pulse current is 10

kA.

The shield is isolated from the case, so no shield-current can exist.

Shield and white lead may be connected to the same ground at the

readout equipment. The cable must be firmly secured to minimise

spurious response during stormy weather (deforming standard cable

produces voltage spikes, a tribo electric effect and capacitance effect).

Kipp & Zonen pyrgeometer cables are of low noise type, however take

care that the terminals '+' and '-' at a connection box have the same

temperature, to prevent thermal EMF's.

A junction box or connector with a metal outer case is advised.

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Celestron CG-4 User Manual Page 29