The IEC 60118-7 standard changed dramatically in 2005. The new version is almost identical to the ANSI S3.22-2003 standard (the telecoil tests remain different). The following table contains the major changes from IEC 94 to IEC 05.
|Reference frequency||Single frequency: 1600 Hz or 2500 Hz||High frequency average (HFA) of 1000, 1600, and 2500 Hz (or special purpose average, as specified)|
|Full-on Gain||Measured at 60 dB SPL for most hearing aids, or 50 dB SPL for high gain hearing aids||Measured at 50 dB SPL for all hearing aids|
|Reference Test Gain (RTG)||Either OSPL90 at ref freq minus 75 or Full-on gain at ref freq minus 7 dB||HFA-OSPL90 – 77|
|Harmonic distortion||Measured at 70 dB at 1/3 octave frequency specified by the manufacturer between 400 and 1600 Hz||Measured at 500 Hz @ 70 dB SPL, 800 Hz @ 70 dB SPL, 1600 Hz @ 65 dB SPL|
|Equivalent Input Noise||Measured with no input Subtract RTG from result.||Measured with no input. Subtract HFA Gain obtained with a 50 dB SPL input.|
|Battery current||Measured at 60 dB SPL input at reference frequency||Measured at 65 dB at 1000 Hz|
|Telecoil||Measured at 10 mA/m at full-on gain.||Measured at 31.6 mA/m at RTG.
A second result measured at 10 mA/m at full-on gain
|I/O||Not required||AGC aids tested at 2000 Hz plus optional 250, 500, 1000, and 4000 Hz frequencies|
|Attack/release||Not required||AGC aids tested at 2000 Hz plus optional 250, 500, 1000, and 4000 Hz frequencies|