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IEC 60904-9:2020 © IEC 2020
•
Wavelength calibration (drift, etc.).
•
Linearity of sensor(s) with intensity/integration time.
Uncertainty analysis typically requires application of Monte-Carlo simulation methods. As
different approaches are in use, which
may lead to different results, no
procedure can be
recommended at the moment.
5.3 Non-uniformity of irradiance in the test plane
5.3.1
General
Depending on the methods used to calibrate a simulator’s irradiance over the designated test
area, the non-uniformity of irradiance may be one of the major sources of uncertainty for
maximum power determination of PV devices. It shall be measured
at each required
irradiance level.
The irradiance non-uniformity in the designated test area of a large-area
solar simulator for
measuring PV modules depends on reflection conditions inside the test chamber (dark room)
or test apparatus. If these conditions change, the non-uniformity classification may also
change. For the purpose of non-uniformity classification, the test chamber or test apparatus
should therefore be considered an integral part of the simulator and should be described in
the simulator classification report and the technical drawing. Such a description may include,
for example: name and address of the
test chamber manufacturer, model number of the test
chamber, and the date and location for testing of irradiance non-uniformity.
The check of non-uniformity should be part of periodical service
and maintenance work in
order to confirm and maintain the classification in the course of the solar simulator operation.
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