otometrics Aurical Hit - 5 Testing hearing instruments; 5.1 Calibrating the reference microphone

5 Testing hearing instruments
Testing a hearing instrument involves the following main tasks:
1. Calibrating the reference microphone
Otometrics recommends that you calibrate the reference microphone daily or weekly. Set up the interval to suit your pur-
poses. See Calibrating the reference microphone ► 9.
2. Positioning the hearing instrument
General instructions are described in
• Traditional BTE hearing instruments ► 11
• Thin-tube hearing instruments ► 12
• ITE hearing instruments ► 13
3. Testing
When you have positioned the hearing instrument correctly, you can test it using the OTOsuite HIT module as described
in How to perform a standard test ► 14 , or you can perform coupler-based fitting as described in the AURICAL FreeFit
and the Probe Microphone Measurements User Manual.
5.1 Calibrating the reference microphone
1. Launch OTOsuite and select the HIT module in the Navigation panel.
2. Position the microphones in the center of the test chamber.
3. Position the reference microphone (1) pointing straight down from above and
centered 1-2 millimeters above the coupler measurement microphone (3).
4. During calibration the microphones must have the exact same distance to the
main loudspeaker (2), along the Z axis. You can ensure this by looking at the
test chamber from the side when you adjust the reference microphone pos-
ition for calibration.
5. Close the lid.
6. Select Tools > AURICALHIT Calibration > Reference Microphone.
7. Follow the on-screen instructions.
Otometrics - AURICALHIT
9
5 Testing hearing instruments