Kippzonen CM 4 Pyranometer Instrukcja Użytkownika Pobierz pdf (Strona 25)

Figure 3.1: Circuit diagram of the CM 4 Pyranometer and connection to

readout equipment.

It is evident that application of attenuator circuits to the CM 4 output

in order to modify the calibration factor is not recommended because

the temperature response will also be affected. However, recorders

with a variable voltage range can be set so that the result can be

read out directly in W/m

A considerable input bias current in the readout equipment can

produce a voltage of several micro-volts across the impedance of the

pyranometer. The correct measured zero signal can be verified with

a resistance replacing the pyranometer impedance at the input

terminals.

With the availability of a low voltage analogue input module with A/D

converter the pyranometer can be connected to a computer or data

acquisition system. The span and resolution of the A/D converter in

the module must allow a system sensitivity of about 1 bit per W/m

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 52 53

Brak uwag

Kippzonen CM 4 Pyranometer Instrukcja Użytkownika Strona 25