Campbell-scientific CM3 Kipp and Zonen Pyranometer Manual de usuario descargar pdf (Pagina 9)

CM3 Pyranometer

If a 21X is used to measure the CM3 and it powers a 12 VDC sensor or 12

VDC radio, the current drawn off the 12 VDC supply may cause a difference in

ground potential between the 21X ground terminals and the reference ground

point in the datalogger. This ground potential results in an offset on single

ended measurements. This offset can be as large as +60 mV. Thus, single

ended measurements should be avoided. The offset does not, however, affect

differential measurements. While the 21X is the logger most susceptible to this

condition, the other dataloggers can be affected if the amount of power is too

large or the power return line is connected to analog ground (AG).

FIGURE 4-1. CM3 Wiring

Color

Function CR10(X),

CR510

21X/CR7 CR23X

Red Signal Differential

Channel - H

Differential

Channel - H

Differential

Channel - H

Blue Signal Reference Differential

Channel - L

Differential

Channel - L

Differential

Channel - L

White Signal Ground AG

≡≡

Clear Shield G

≡≡

White = Signal Ground

Blue = Signal Reference

Red = Signal

Clear = Shield

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Campbell-scientific CM3 Kipp and Zonen Pyranometer Manual de usuario Pagina 9