Kippzonen CNR 4 Net Radiometers User Manual download pdf (Page 22)

Figure 2.4 The directional response, or cosine response, of the pyranometer:

On the horizontal axis, the zenith angle is shown (0E zenith angle equals 90E angle of incidence).

The vertical axis shows the deviation from the ideal cosine behaviour expressed in percents.

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Kippzonen CNR 4 Net Radiometers User Manual Page 22