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Contents Section 1 Test and Measurement Pat Brown 1.1 Test and Measurement 1.1.1 Why Test? 1.2 Electrical Testing 1.3 Acoustical Testing 1.3.1 Sound Level Measurements 1.3.1.1 Conclusion 1.3.2 Detailed Sound Measurements 1.3.2.1 Sound Persistence in Enclosed Spaces 1.3.2.2 Amplitude versus Time 1.3.2.3 The Transfer Function 1.3.3 Measurement Systems 1.3.3.1 Alternate Perspectives 1.3.4 Testing Methods 1.3.4.1 FFT Measurements 1 2 2 3 4 10 11 12 13 16 17 19 19 20