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Test Box Measurement

Standard and Non Standard Tests

QuestionAnswer
SSPL Frequency response at full volume with an input of 90dB
OSPL90 Output SPL with input of 90dB at full volume
Maximum Gain Gain of hearing aid measured at full volume with an input of 50dB
Gain at Reference Test Frequency Maximum gain measured at the reference test frequency
Reference Test Gain Gain measured at a simulated user setting with an input of 60dB
Harmonic Distortion Total harmonic Distortion measured at the reference test gain at a variety of frequencies
Input Noise Internal noise of the hearing aid with no input signal
Battery Current Amount of current used by the battery as measured with the battery pill
Induction Coil Sensitivity Signal strength of the induction coil at full volume with the hearing aid moved to achieve maximum response
AGC Knee Point Measured using an input output function (point at which compression ratio/gradient changes
AGC Attack and Release Times Time taken for compression to be start and stop where a loud sound is applied
Frequency Response Gain – frequency response at the reference test gain
Input - Output Curves Measured at one frequency with different input levels, output levels are measured and plotted to measure gain at each level
Non - Standard test using composite signals (2) Gain frequency response curve at any input level Output frequency response curve at any input level
Non - Standard test using pure tones (4) Distortion frequency curves Input output curves Gain frequency response curve at any input level Output frequency response curve at any input level
Created by: Youworktoohard