A measurement comparison of noise temperature has been carried out between four National Metrology Laboratories in coaxial line at 30 MHz, 60 MHz and 1 GHz. The identification of this intercomparison is CCEM.RF-K18.CL. Two noise sources have been measured. The following four national laboratories participated in this intercomparison: NPL (United Kingdom), NIST (United States of America), BNM-LNE (France) and VNIIFTRI (Russia). The National Physical Laboratory (United Kingdom) acted as the pilot laboratory for the comparison. It can be seen that, there is generally good agreement between the laboratories.

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E-field probes used for measurement of worker exposure are usually calibrated in continuous wave (CW) conditions. For many types of probe, the response in realistic environments (modulated signals, multi-frequency and pulsed signals) differs from the response to CW conditions. However, to fully characterize a field probe in all possible environments would be an infinite task.In this paper we consider the effect of multiple CW signals and of several common communications formats on the indication given by a field probe with the objective of identifying simple tests which could act as a predictor of the performance alteration in non-CW environments.