Appendix iv, Classification according to wmo guide 1996, Cmp/cma series manual – Campbell Scientific Kipp and Zonen CMP-Series Pyranometers User Manual
Page 33: Page 32
CMP/CMA series manual
Page
32
Appendix IV
classification According to WMO Guide 1996
Characteristics
CMP 22
CMP 21
CMP 11
CMA 11
CMP 6
CMA 6
High
quality
Good
quality
Moderate
quality
ISO 9060 classification
Secondary
standard
Secondary
standard
Secondary
standard
First class
Secondary
standard
First class
Second
class
Response time (95 percent
response)
5 s
5 s
5 s
18 s
< 15 s
< 30 s
< 60 s
Zero offset:
(a) Response to 200 W/m
2
net thermal radiation
(ventilated)
(b) Response 5 K/h change
in ambient temperature
± 3 W/m
2
± 1 W/m
2
± 7 W/m
2
± 2 W/m
2
± 7 W/m
2
± 2 W/m
2
± 15 W/m
2
± 4 W/m
2
± 7 W/m
2
± 2 W/m
2
± 15 W/m
2
± 4 W/m
2
± 30 W/m
2
± 8 W/m
2
Resolution (smallest detectable
change)
± 1 W/m
2
± 1 W/m
2
± 1 W/m
2
± 1 W/m
2
± 1 W/m
2
± 5 W/m
2
± 10 W/m
2
Stability (change per year,
percentage of full scale)
< 0.5
< 0.5
< 0.5
< 1
± 0.8
± 1.5
± 3.0
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
2
)
± 5 W/m
2
± 10 W/m
2
± 10 W/m
2
± 20 W/m
2
± 10 W/m
2
± 20 W/m
2
± 30 W/m
2
Temperature response (percentage
of maximum due to any change of
ambient temperature within an
interval of 50 K)
± 0.5
-20
0
C-+50
0
C
± 1
-20
0
C-+50
0
C
± 1
-10
0
C-+40
0
C
± 4
-10
0
C-+40
0
C
± 2
± 4
± 8
Non-linearity (percentage deviation
from the responsivity at 500 W/m
2
due to any change of irradiance
within the range 100 to 1000 W/m
2
)
± 0.2
± 0.2
± 0.2
± 1
± 0.5
± 1
± 3
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)
± 2
± 5
± 10
Tilt response (percentage deviation
from the responsivity at 0
° tilt,
horizontal, due to change in tilt from
0
° to 90° at 1000 W/m
2
irradiance)
± 0.2
± 0.2
± 0.2
± 1
± 0.5
± 2
± 5
Achievable uncertainty, 95 percent
confidence level
Hourly totals
Daily totals
1 %
2 %
2 %
5 %
3%
2%
8%
5%
20%
10%