The 42B is a wattmeter from Boonton. A Wattmeter is an instrument for measuring the electric power (or the supply rate of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
- Power and Frequency are both sensor dependent.
- Measures the range 1 nW to 10 mW (-60 dBm to +10 dBm) in 7 ranges.
- Operates over the 200 kHz to 18 GHz range.
- DC output linear with power.