– 12 –
IEC 60904-9:2020 © IEC 2020
Note 1 to entry: A low value of SPD is in principle more desirable than a high value of SPD. Values for SPD may
exceed 100 %. In this document no requirements for this parameter are defined.
Note 2 to entry: The parameter SPD is also used for characterizing light sources in non-photovoltaic applications
(EN 13032-1). No specific guidance can be given at this time regarding its use for assessing
PV module power
measurement uncertainties.
4 Classification of solar simulator characteristics
Table 3 gives the performance requirements for the three characteristics spectral match, non-
uniformity of irradiance and temporal instability of irradiance.
For the spectral match, all six intervals shown in Table 1 or Table 2 shall agree with the ratios
in Table 3 to obtain the respective classes.
– Spectral irradiance of solar simulators shall be evaluated in the extended wavelength
range according to Table 2.
– Solar simulators in use and solar simulators in production/sale that have
been classified
under Edition 2 of this document make an exception. Spectral irradiance of these can be
re-evaluated according to the same method (that of Edition 2) in the restricted wavelength
range. For that purpose Table 1 shall be referenced. This exception
shall ensure the
backward compatibility, if required.
– If a significant change of PV technology occurred in the production
of PV devices, the
customer is encouraged to perform spectral classification in the extended wavelength
range and use Table 2 to re-evaluate the simulator. In addition the sensitivity analysis for
spectral mismatch uncertainty as of Annex A shall be applied.
– The method used for the spectral classification renewal (restricted or extended wavelength
range) should be clearly stated in the report.
Refer to Clause 5 for procedures to measure and calculate the three characteristics of the
simulator (spectral match, non-uniformity of irradiance and temporal instability of irradiance).
In addition the parameters SPC and SPD shall be calculated. These results for SPC and SPD
are informative.
If stated by the manufacturer a number of flashes or on-time to stabilize irradiance should be
done prior to the classification.
These requirements apply to both steady state and pulsed solar simulators.
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