IEC 60904-9:2020 © IEC 2020
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Figure 3 – Evaluation of STI for a short pulse solar simulator
5.4.2
Solar simulators for irradiance exposure
For steady-state solar simulators used for irradiation endurance tests only the value of LTI is
relevant for classification. The following procedure is used to determine the LTI:
a) Record the irradiance variations in the time period of interest by using
a suitable
irradiance sensor and an appropriate averaging time. If multi-lamp systems are used a
representative number of locations in the designated test area shall be specified.
b) Determine maximum irradiance and minimum irradiance from data measured in step a).
c) Determine the LTI using the data from step b), formula (2).
d) Apply the calculated value of LTI to determine the classification in Table 3.
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