IET 1840-A Overview
Output Power Meter The 1840A Output Power Meter measures audio-frequency power into any desired magnitude of load impedance. Its important uses include the measurement of power output of oscillators, amplifiers, preamplifiers, transformers, transducers, and low-frequency lines. Power: 0.1 mW to 20 W, 40Hz to 20kHz Impedance: 0.6 ohm to 32kohms