IEC 60904-9:2020 © IEC 2020
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NOTE Spatial non-uniformity of irradiance corresponding to Class A+ is consistent with the requirements specified
in IEC 60904-2 for calibration of reference devices using simulated sunlight.
If spectral match evaluation is performed in the restricted wavelength range according to
Table 1, only the
classifications A, B and C are permitted for each
solar simulator
characteristic (backward compatibility to previous Edition of this document).
Practical examples for different applications of solar simulators are given in IEC TR 60904-14.
5.1 Introductory remarks
It is the intent of this document to provide guidance on the
required solar simulator
performance data to be taken, and the required locations in the designated test area for these
data to be taken. It is not the intent of this document to define the
possible methods to
determine the simulator spectrum or the irradiance at any location on the test plane. It is the
responsibility of the simulator manufacturer or test laboratory to
provide information upon
request for test methods used in the determination of the performance in each classification.
The classification of a solar simulator does not provide full information about sources of
measurement uncertainty that are related to PV performance measurements obtained with a
classified solar simulator. Such uncertainties are dependent on the actual measurement
devices and procedures used and need to be evaluated.
In general, the classification of solar simulators will depend on a number of factors. Also most
simulators can be operated at different working points (for example different irradiances). In
this case, the classification is only valid for the conditions similar to those during classification
assessment. If the intended use of the solar simulator includes a change of irradiance levels,
classification shall be performed and reported at these irradiance levels ± 50 W/m
2
.
Classification of a solar simulator is not constant but subject to various factors:
– Ageing of lamp with operation time.
– Exchange of lamp(s.)
– Lamp power setting.
– Use of any inserts in the beam of light such as optical filters or (light reducing) masks or
meshes.
– Ageing or soiling of any inserts.
– Reflections from the surroundings such as properties of dark room walls.
–
Pulse duration, if applicable.
Accordingly, classification only refers to the actual operating conditions. Ideally, classification
as stated in the product specification or test report shall cover the
range of operating
conditions during practical use. Classification should be reviewed periodically.
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