Frye FONIX FP40D - Manual (Page 64)

56 FONIX FP40 Portable Hearing Aid Analyzer
Here are the major differences between ANSI 03 and ANSI 96:
• When you set up an AGC aid for an ANSI 03 test sequence, you will start with its compression
controls set to minimum (with the compression knee point set as high as possible). Just before
the input/output measurements, the test sequence will pause to allow you to set the compres-
sion controls of the aid to maximum (with the compression knee point set as low as possible).
In ANSI 96, AGC aids are tested with their compression controls set to maximum for all mea-
surements.
• When you adjust the gain control of the hearing aid midway through the ANSI 03 automated
test sequence, the measured reference test gain value needs to be within 1.5 dB of the target
value. In ANSI 96, the measured valued needs to be instead of within 1 dB of the target value.
• The EIN formula in ANSI 03 uses a 50 dB SPL input instead of the 60 dB SPL input used in
ANSI 03. With ANSI 96, any aid with a compression knee point below 60 dB SPL showed arti-
ficially high EIN results. This means that ANSI 03 EIN test results should be better (lower) for
AGC aids.
4.1.1 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 ANSI test sequence. Otherwise, use the following guidelines:
• Set the controls of the aid (except the compression controls) to give the greatest possible out-
put and gain.
• Set the aid for the widest frequency response range.
• Set AGC aids to achieve minimum possible compression.
• Make sure the gain control of the aid is full-on.
Follow the instructions from Section 3.3 to set up the aid in the test box for testing.
4.1.2 Setting up the analyzer for testing
To enter the ANSI 03 screen:
1. From the Main Coupler Screen, look at the FP40’s display above the F4 function key. If it says
“AN03,” skip to step 6.
2. Press F1 – Menu.
3. Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY
DEFIN.
4. Press START/STOP to choose AN03. This will let you use the F4 function key to enter the
ANSI 03 screen from the Main Coupler Screen.
5. Press F1 to return to the Main Coupler Screen.
6. Press F4 to enter the ANSI 03 screen.