FONIX® 8000 - Frye Electronics

Automated Test Sequences 113
5.2.4 Viewing ANSI 92 Results
1. Family of composite gain curves made at 50, 60, 70, 80 and 90 dB SPL,
2. NSPL90—Maximum RMS output sound pressure level (SPL) produced with
a 90dB RMS speech-weighted noise input SPL signal.
3. Full-On Noise Gain—Maximum RMS gain with a 60dB SPL noise input signal.
(Note: This test may not elicit a true reading of maximum gain for hearing
aids with an onset of non-linear operation below 60dB.)
4. Target Reference Gain—This information is only displayed when the actual
gain is greater than the calculated desired setting of gain. This target is used
to adjust the hearing aid’s actual gain to a level of ±1 dB of the target. The
figure is calculated by adding the 60dB SPL input + 17dB and subtracting it
from the NSPL90 RMS output. (NSPL90 D-77 = desired setting of gain)
5. Actual Reference Gain—The measured amount of gain when the hearing aid
is set to the reference test position.
6. Noise I/O Curve –This demonstrates the compression or limiting of the nonlinear
circuit.
For a more detailed explanation of these terms, consult the ANSI S3.42-1992
standard.
Figure 5.2.4—ANSI 92 test results