Measurements made at RTGP (cont.)
Harmonic Distortion
- Occurs when new frequencies are generated that are harmonics of the original signal
- Input = 70 dB SPL and measure total harmonic distortion at 500 and 800 Hz
- Input = 65 dB SPL and measure total harmonic distortion at 1600 Hz
Equivalent Input Noise Level = (Ln: EIN)
- Input = 60 dB SPL, determine average coupler SPL’s at 1000, 1600, and 2500 Hz
- Remove the 60 dB SPL input and measure inherent noise of the HA
Battery Current
- Input = 65 dB SPL at 1000 Hz