CISPR 16-1-1:2015 is available as CISPR 16-1-1:2015 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. CISPR 16-1-1:2015 specifies the characteristics and performance of equipment for the measurement of radio disturbance in the frequency range 9 kHz to 18 GHz. In addition, requirements are provided for specialized equipment for discontinuous disturbance measurements. This fourth edition cancels and replaces the third edition published in 2010, Amendment 1:2010 and Amendment 2:2014. This edition constitutes a technical revision. The contents of the interpretation sheet 1 of April 2018 have been included in this copy.