Table of Contents
Advertisement
APPENDIX I
Characteristics
ISO 9060 classification
Response time (95 percent response)
Zero offset:
2
(a) Response to 200 W/m
net thermal radiation
(ventilated)
(b) Response 5 K/h change
in ambient temperature
Resolution (smallest detectable
change)
Stability (change per year,
percentage of full scale)
Directional response of beam
radiation
(The range of errors caused by
assuming that the normal incidence
responsivity is valid for all directions
when measuring, from any direction,
a beam radiation whose normal
incidence irradiance is 1000 W/m
Temperature response (percentage
of maximum due to any change of
ambient temperature within an
interval of 50 K)
Non-linearity (percentage deviation
from the responsivity at 500 W/m
due to any change of irradiance
within the range 100 to 1000 W/m
Spectral sensitivity (percentage of
deviation of the product of spectral
absorptance and spectral
transmittance from the corresponding
mean within the range of 0.3 to 3 μm)
Tilt response (percentage deviation
from the responsivity at 0° tilt,
horizontal, due to change in tilt from
2
0° to 90° at 1000 W/m
irradiance)
PYRANOMETER CLASSIFICATION
ACCORDING TO WMO GUIDE 1996
High
Good
quality
quality
Secondary
First class
standard
< 15 s
< 30 s
± 7 W/m
± 15 W/m
2
± 2 W/m
2
± 4 W/m
± 1 W/m
± 5 W/m
2
± 0.8
± 1.5
± 10 W/m
2
± 20 W/m
2
)
± 2
± 4
2
± 0.5
± 1
2
)
± 2
± 5
± 0.5
± 2
Moderate
quality
Second class
< 60 s
2
± 30 W/m
2
2
± 8 W/m
2
± 10 W/m
2
2
± 3.0
2
± 30 W/m
2
± 8
± 3
± 10
± 5
43
Advertisement
Table of Contents
