Additional Features: Frequency range: 10 MHz to 18 GHz VSWR: < 1.3:1 Nominal ENR 15 dB Low SWR for reducing noise figure (NF) measurement uncertainty Individually calibrated ENR values at specific frequencies to enhance accuracy Since the 346B is broadband, it eliminates the necessity for several sources at different frequency bands. The low SWR of the noise source reduces a major source of measurement uncertainty; reflections of test signals. The Agilent 346B's high ENR, low SWR, and variety of connectors make it a general-purpose noise source.