This part of IEC 62627 reports the measurement results of two round robin test programs each carried out on SC/PC and SC/APC plug style fixed attenuators. The work was initiated at Cenelec TC 86BXA in June 2003 in order to get a clear understanding on the accuracy and repeatability of the spectral attenuation loss measurements on fixed attenuators.

Out of these results recommendations are made for attenuation tolerance values that can be used in the performance standards.