Energy spectra of delayed neutrons from the precursors 93,94,95Rb and 143Cs have been measured by use of an on-line mass spectrometer and a 3He neutron spectrometer. Details of the experimental techniques, data analysis, and error estimates are given. A comparison of delayed-neutron spectra for 87Br, 93,94,95Rb, and 143Cs measured by three different laboratories is presented. Peak structures are reproduced by all laboratories, but the relative intensities below 200 keV vary according to different measurement or data analysis techniques.