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4
OPERATION
After completing the installation the pyranometer will be ready for
operation.
The irradiance value (E) can be simply computed by dividing the
output signal (U
) of the pyranometer by its sensitivity (S
emf
shown in formula 1, or by multiplication of the voltage value with the
reciprocal of the sensitivity, often called the calibration factor. The
CM 4 pyranometer sensitivity is given in the supplied calibration
certificate.
For calculation of the solar irradiance the following formula must be
applied:
=
E
S
E
= Global radiation
U
= Output of pyranometer
emf
S
= Sensitivity of pyranometer
ensitivity
U
emf
ensitivity
2
[W/m
[μV]
[μV/W/m
4. OPERATION
) as
ensitivity
(Formula 1)
]
2
]
27
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