Power Sensor 100kHz-2GHz, 75ohm The Agilent (now Keysight) 8483A thermocouple power sensor is designed for use with the EPM series, EPM-P series, 70100A, E1416A and the discontinued 43x power meters, and provides extraordinary accuracy and stability. The 8483A power sensor gives you extremely low SWR, and is traceable to the U.S. National Institute of Standards and Technology (NIST). This sensor is the only 75 ohm impedance sensor in the 8480 series.