IEC 60904-2:2015 pdf download

10-20-2020 comment

IEC 60904-2:2015 pdf free download.Photovoltaic devices – Part 2: Requirements for photovoltaic reference devices.
IEC 60904-2:2015 gives requirements for the classification, selection, packaging, marking, calibration and care of photovoltaic reference devices. This standard covers photovoltaic reference devices used to determine the electrical performance of photovoltaic cells, modules and arrays under natural and simulated sunlight.
4 Selection of reference device
4.1 General requirements
Depending on their intended use, reference devices need to meet different requirements in and electrical circuit. The spectral responsivity of the reference device, for example, is determined by the transmission of any protective cover in front of the device and the spectral sponsivity of the device itself. Therefore the overall spectral responsivity can be adapted by using suitable filters as or in addition to the protective cover.
If a shunted reference cell is to be used for low irradiance measurements, either a dedicated cell can be constructed with the restriction of formula(1), where the short circuit current is considered at the desired low irradiance rather than at STC. Alternatively a shunted cell can have a larger shunt resistor, but requires a separate calibration for each irradiance and temperature it is to be used at.
It is recommended that the shunt resistor be a removable 4-wire resistor. to allow for periodic checking of the reference device stability by taking an I-V curve per IEC 60904-1.

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