The Agilent 11693A provides protection for the input circuits of spectrum analyzers, amplifiers, counters, and other alternative instruments from high power levels with effects that are minimal on measurement performance. The Agilent 11693A microwave limiter (0.1 to 12.4 GHz, useable to 18 GHz), counters input signals more than 1 milliwatt up to one-watt average power & ten watts peak power.