This part of IEC 60904 gives guidance for the measurement of the spectral responsivity (SR) of multi-junction photovoltaic devices. It is principally intended for non-concentrating devices, but parts may be applicable also to concentrating multi-junction PV devices.
The requirements for measurement of SR of single-junction PV devices are covered by IEC 60904-8 whereas this standard describes the additional requirements for the measurement of SR of multi-junction PV devices.