centigrade. The sensitivities are about 2 mV/J*cm
- 2
*min
- 1
Their spectral range,including the wavelength is from 0.3 to
3u.
For the standardisation of pyranometers, the preferred method
is comparison with a standard pyrheliometer using the sun as
a source. More often, one pyranometer is checked against
another. This method requires a high quality reference
instrument which is regularly calibrated against a recognized
standard.
- Pyranometers with an appropriate device (disc or shadow
ring) to screen off direct solar radiations are used to
measure the sky radiation. For the measurement of reflected
global radiation (albedo) pyranometers are exposed
downwards.
- For measurements of shortwave radiation falling from the
sun and sky and from soil or another reflection on a freely
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