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SP Lite2 Silicon Pyranometer

FIGURE 2. SP Lite2 Electrical Circuit

1.2 Spectral Properties

The spectral properties of the SP Lite2 are mainly determined by the spectral

response of the photodiode, which is shown in Figure 3, below.

FIGURE 3. Spectral Sensitivity of Pyranometers Compared with Solar

Radiation

The SP Lite2 is calibrated for solar radiation under clear sky conditions. The

spectrum for these conditions, at sea level, is also shown in Figure 3.

Unfortunately, however, the actual solar spectrum varies as a function of cloud

cover, season and solar elevation. Since the pyranometer does not have a flat

sensitivity across the whole solar spectrum, the accuracy of its response will

vary. However, the error range across the whole spectrum has been proven to

be small. The maximum total estimated error will only be in the region of ±5%

when compared to the calibration conditions.

Wavelen

(

)

Spectral response of

thermopile pyranometer

Solar radiation curve at

sea level

Spectral response of

silicon pyranometer

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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Campbell SP-LITE Bedienungsanleitung Seite 6