EKO INSTRUMENTS CO., LTD. - Pyranometer MS-60/60S - Instruction Manual Ver. 4
Pg. 29
A - 2 . P y r a n o m e t e r C h a r a c t e r i s t i c s
Table A-2. Pyranometer Characteristics [see also CIMO Guide, WMO No. 8, 2008]
Response Time
The time [seconds] of a pyranometer sensor to reach 95% of its final output signal.
[ISO 9060: 2018 added] If the response time reach to 95% is less than 0.5 seconds, "fast
response" is attached to the applicable class as a subcategory.
Zero Off-Set a
Response [dark-signal] to 200W/m2 net thermal radiation [ventilated]
Zero Off-Set b
Response [dark-signal] to 5K per hour change in ambient temperature
Total Off-set c
[ISO 9060: 2018 added] Total zero off-set including the effects a], b] and other sources
Non-Stability
Rate of change [%] of the pyranometer sensitivity per year.
Nonlinearity
Percentage deviation from the responsivity at 500W/m2 due to any change of irradiance
within the range 100W/m2 to 1,000W/m2.
Directional
Response
Also referred to as cosine error [W/m2]; 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 1,000W/m2
[ISO 9060: 2018 modified] Include the zenith angle of zenith angle 90 ° or more.
Spectral error
[ISO 9060: 2018 added] Maximum spectral mismatch error of Pyranometer [%] with respect to
spectral irradiance at AM 1.5 and AM 5 under multiple atmospheric conditions on fine weather
against the reference standard spectral irradiance defined by IEC60904-3: 2016 Photovoltaic
devices -
”Measurement principles for terrestrial photovoltaic [PV] solar devices with reference
spectral irradiance data.”
Spectral
selectivity
Percentage deviation of the product of spectral absorptance and spectral transmittance from
the corresponding mean within the range
0.35μm to1.5μm.
Spectrally flat
Pyranometer
[ISO 9060: 2018 added] If the spectral selectivity is less than 3 %, "spectrally flat" is attached
to the applicable class as a subcategory.
Temperature
Response
[ISO 9060: 2018 modified] Percentage maximum output error due to any change of ambient
temperature between -10 to 50
℃
against the output at 20
℃
.
Tilt Response
[ISO 9060: 2018 modified] Percentage deviation from the responsivity at 0
̊ tilt [horizontal] due
to change in tilt from 0
̊ to 180 ̊ at 1,000W/m2.
Additional
processing
errors
[ISO 9060: 2018 added] Error generated when converting the analog output of Pyranometer
or Pyrheliometer into a digital signal with a signal converter etc.