The Type 1382 Random-Noise Generator (Figure 1-1} provides a high level of electrical noise at its output terminals. This type of signal is useful in room-acoustics studies, loudspeaker and microphone tests, psychoacoustic tests, filter tests, crosstalk measurements, calibration checks on recording systems, modulation of signal generators and test oscillators, shaker-driven vibration tests, and airborne vibration tests. It can also be used for tests of the rms response of meters, observation of resonances in systems, electrical averaging of resonant responses, comparisons of effective bandwidths, and for other tests when a signal with a high peak-to-rms factor is useful, as in overload testing. The choice of spectra and the provision of a balanced output make the Type 1382 Random-Noise Generator particularly suitable for audio and acoustical applications. A pair of these generators can be used as signal sources for the demonstration of various degrees of correlation, possible errors of random sampling, and other concepts of statistical theory. A companion instrument, the Type 1381 Random-Noise Generator, produces white noise over the range from 2 Hz to upper cutoff frequencies of 2, 5, or 50 kHz. Its output noise can be clipped, if desired, at 2, 3, 4, or 5 a.