The Model 204B Oscillator (figure 1-1) is a transistorized battery-powered instrument which produces sine-wave signals in the 5-cps to 560-kc range. The output is 10 milliwatts into 600 ohms and is continuously adjustable over at least a 40-db range. Into the rated load of 600 ohms, frequency response is within ±3%. The oscillator output is floating, isolated from power line ground and instrument chassis.