Automated Test Sequences 67
4.4.3 Viewing the results
See Figure 4.4.3 for an an example of ANSI 92 results.
1. NSPL90: RMS of Composite signal response curve taken at 90 dB SPL
2. FULL-ON NOISE GAIN: RMS of response curve taken with the Composite signal at 60 dB SPL
minus RMS of the input signal
3. TARGET REF GAIN: Calculated reference test gain
4. ACTUAL REF GAIN: Measured reference test gain
5. CRV 5-9: Response curves at varying amplitudes
6. I/O: Input/output measurement using Composite signal
Figure 4.4.3. —ANSI 92 results
4.5 IEC
The IEC (International Electrotechnical Commission) test sequence allows you to test hearing aids
according to the IEC 118-7 standard, the performance part of the IEC hearing aid standard, as
amended in 1994.
4.5.1 Setting up the aid for testing
When possible, follow the procedure recommended by the hearing aid manufacturer when setting
up the aid to perform an IEC test sequence. Otherwise, use the following guidelines:
• Set the controls of the aid to give the greatest possible output and gain. For AGC aids, this is
usually accomplished by setting the aid for the minimum compression
• Set the aid for the widest frequency response range.
• Make sure the gain control of the aid is full-on.
