Primary Solar Cell Standards Comparison of Extraterrestrial Synhetic Calibration

First results of a comparison between two sets of reference cells are presented of which one was calibrated using an extraterrestrial method in the frame of a CNES balloon flight while the other set was calibrated using the SI-traceable synthetic differential spectral responsivity method of the German metrological institute PTB. Measuring a representative set of 3G28 triple-junction solar cells from AZUR SPACE Solar Power GmbH against the two different sets of reference cells gave results which were in very good agreement with each other especially when taking into account the non-ideal conditions that had to be coped with during this study.