Frye FONIX 7000 - Manual (Page 126)

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FONIX 7000 Hearing Aid Analyzer
For some aids, the analyzer will pause the test and tell you to turn the aid down
to reference test gain. Adjust the volume of the aid until it comes within 1 dB
of the target gain. Take care not to move the aid from its position. If you must
move it in order to adjust the gain control, replace as close as possible to its
original position. Push [START] to complete the test.
To delete the displayed results, press [F4] and use [∨, ∧] to select DELETE ALL
CRVS. Press [>] to perform the deletion.
5.2.3 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 sig-
nal. (Note: This test may not elicit a true reading of maximum gain for hear-
ing 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 non-
linear circuit.
For a more detailed explanation of these terms, consult the ANSI S3.42-1992
standard.