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4.5.2 Test Procedure.
The device under test shall be subjected to successively higher powers and allowed to reach thermal equilibrium at each increment (approximately 2 h). Power shall be determined as the square of applied rms voltage, as measured with a “true rms” voltmeter, divided by Zmin. The rated power of the device shall be that power the device can withstand for 2 h without permanent change in acoustical, mechanical, or electrical characteristics greater than 10%. |
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