Excellent SWR for reducing mismatch uncertainty Accurate calibration and traceability to US National Institute of Standards and Technology (NIST) Compatible with EPM (new N1913A/ 14A, E4418B/ 19B), EPM-P (E4416A/ 17A) and P-series (N1911A/ 12A) power meters, plus the E1416A VXI and discontinued 70100A and 43X power meter Accurate average power measurements over -70 to -20 dBm Frequency range 10 MHz to 18 GHz Diode power sensing element > The 8481D diode power sensor measures average power over the frequency range 10 MHz to 18 GHz and power range -70 to -20 dBm (50 dB dynamic range). The Keysight 11708A 30 dB attenuator is supplied with 8480 series power sensors with the D suffix, for calibration with the power meter 0 dBm, 50 MHz reference.