IEC 61326-2-1 Ed. 1.0 b:2005, Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 2-1: Particular requirements ... criteria for sensitive test and measurement

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.