EKO MS-802 - Pyranometer Characteristics

EKO INSTRUMENTS CO., LTD. - Pyranometers MS-802/802F/402/402F/602 - Instruction Manual Ver.13
Pg. 26
A-2. Pyranometer Characteristics
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 40℃ 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.