IEC 61326-2-1:2012 specifies more detailed test configurations, operational conditions and performance criteria for equipment with test and measurement circuits (both internal and/or external to the equipment) that are not EMC protected for operational and/or functional reasons, as specified by the manufacturer. This second edition cancels and replaces the first edition published in 2005. This edition constitutes a technical revision. The main technical changes are: Update with respect to IEC 61326-1:2012. This publication is to be read in conjunction with IEC 61326-1:2012.