FIELD: instrumentation engineering. SUBSTANCE: test system has tunable sine-signal generator 1, scaling amplifier 2, selector switch 3, acoustic test chamber 4, audio signal source 5, object 6 to be tested, test microphone 7, magnetic loop 8, OR gate 9, two controlled amplifiers 10, 11, filter unit 12, two switches 13, 19, detecting unit 14, analog-to-digital converter 15, scale range setting unit 16, control unit 17, counter 18, main storage 20, data input unit 21, recording unit 22, comparison unit 23, fast Fourier transform unit 24, amplitude setting unit 25, voltage setting unit 26, resistance setting unit 27, adjustable power supply 28. Magnetic loop, audio signal source, object under test, and microphone are installed in test chamber. EFFECT: improved design. 2 cl, 4 dwg
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