IEC 60904-9:2020 © IEC 2020
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Figure 1 – Locations for spectral irradiance measurement of
a rectangular test area (left) and a circular test area (right)
b) Spectral irradiance should be reported in tabular form with
a minimum of one data point
per 10 nm interval in the total wavelength range 300 nm to 1 200 nm. Averaging of data
points is permitted to reduce the number of data points.
c) The spectral irradiance data taken at all test locations should be integrated (trapezoid type)
in the total wavelength range (400 nm to 1 100 nm or 300 nm to 1 200 nm) and the
percentage contribution of the 6 wavelength intervals defined in Table 1 or Table 2 to the
integrated irradiance determined.
d) For each test location calculate the spectral match for each wavelength
interval, which is
the ratio of calculated percentage for the simulator spectrum and the AM1.5 reference
spectral irradiance.
e) For each test location the data comparison with the reference
spectrum shall indicate the
spectral match classification as per the following:
Class A+: Spectral match within 0,875 to 1,125 for each
wavelength interval, as
specified in Table 3. This classification can be only assigned if spectral match
evaluation is performed according to Table 2.
NOTE Class A+ is restricted for the case that spectral match is evaluated over the extended
wavelength range of 300 nm to1 200 nm.
Class A:
Spectral match within 0,75 to 1,25 for each wavelength interval, as specified
in Table 3.
Class B:
Spectral match within 0,6 to 1,4
for each wavelength interval, as specified in
Table 3.
Class C:
Spectral match within 0,4 to 2,0 for each wavelength interval, as specified in
Table 3.
f) All intervals shown in Table 1 or Table 2 shall agree with the spectral match ratios in
Table 3 to obtain the respective classes.
g) The spectral classification of the solar simulator is determined by the test location and
interval with worst case spectral match.
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