Celestron CG-4 Bedienungsanleitung PDF herunterladen (Seite 31)

INSTALLATION

Kipp & Zonen supplies shielded low-noise extension cables up to

lengths of 200 m which are coupled by waterproof connectors to the

CG 4 cable. The lead resistance is 8 Ohm/100 m.

A considerable input bias current of the readout equipment can

produce a voltage of several micro Volts across the impedance of the

pyrgeometer. The correct measured zero signal can be verified with a

resistance replacing the pyrgeometer impedance at the input

terminals.

The pyrgeometer can also be connected to a computer or data

acquisition system. A low voltage analogue input module with A to D

converter must be available for thermopile readout. The span and

resolution of the A to D converter in the module must allow a system

sensitivity of about 1 bit per W/m

. For calculation of the downward

radiation, temperature data has to be converted to absolute body

temperatures in Kelvin units. A thermistor connection to the Campbell

data logger is shown in figure 3.4

The connection of the Pt-100 is shown in figure 3.5

Figure 3.4 Example of a CG 4 with a thermistor connected to a Campbell

data logger

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Celestron CG-4 Bedienungsanleitung Seite 31