The EICO ModeL 379 is a sine and square wave generator that provides highly stable sinusoidal voltages throughout the frequency range of 20 Hz to 2 mHz, and square-wave voltages ranging from 20 Hz to 200 kHz. Designed to generate the frequencies required for testing all audio and supersonic equipment, its low distortion sine-wave signals, coupled with its very sharp square-wave signals, make the Model 379 especially suitable for checking high-fidelity amplifiers and transducers. This instrument is also ideal for testing sonar apparatus. FEATURES 1. The oscillator consists of a low distortion Sultzer feedback circuit that uses a high-impedance input FET for increased frequency stability 2. Sine-wave and square-wave voltages are generated simultaneously at the same frequency, and are made available at separate output terminals. 3. The output level of each of the two channels is independent of the other. Each channel is equipped with its own OUTPUT LEVEL control (SINE WAVE or SQUARE WAVE). 4. The sine-wave output provides continuous coverage of all the frequencies from 20 Hz to 2 mHz in five bands. The sinusoidal voltage may be varied from zero to 6. 5 volts when driving a 600-ohm load. 5. Amplitude variations in the sine-wave signals are maintained within ±1 db throughout the four lower bands and ±2 db on the highest band. Distortion, rated at 0.25%, is less than 0.1% over a good portion of the audio spectrum. The continuous coverage of all frequencies from 20 Hz to 2 mHz makes this -unit ideal for testing speaker systems. 6. The square-wave output can be varied from 0 to 10 volts peak-to-peak and covers all frequencies from 20 Hz to 200 kHz. These correspond to bands 1 through 4. In band 5, the square-wave channel is automatically disabled- With a rise time of less than 0.1 microsecond at 20 kHz, the waveform is ideally suited for square-wave testing the finest high-fidelity amplifiers. 7. The instrument power supply incorporates a power transformer for maximum safety, eliminating shock hazard.