LOW-FREQUENCY WAVE ANALYZER TMB TYPE 272-1A.
DAVID TAYLOR MODEL BASIN WASHINGTON D C
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A low frequency wave analyzer for use in the measurement and spectrum analysis of complex low audio frequency signals is described. The instrument was designed particularly for use in the detection, identification and analysis of underwater sounds, however, its use is not limited to this particular application. By means of this instrumentation, the frequency and intensity of the fundamental and five of its harmonics may be simultaneously determined. Provision is made for direct reading, recording and visual A-scope presentation. The tuning ratio is approximately 3 to 1. The tuning range of each of the six channels may be selected by plug-in circuit elements. Plug-in elements furnished with the prototype model cover the fundamental range of five to fifteen cps, and seventh, eighth, ninth, tenth, and eleventh harmonics of this range. Single dial tuning control is provided. Tracking of the six channels is accurate within plus or minus 1 percent. Author
- Test Facilities, Equipment and Methods