Item No. 8105088 – 12/2013 Page 5 of 7
6. Perform the Open Fit calibration:
Open Fit Calibration steps:
1. Position the probe tube in the patient’s ear canal.
2. Place the hearing aid, connected to the hearing aid fitting software, inside the patient’s ear.
3. MUTE or SWITCH OFF the hearing aid.
4. Choose the stimulus (ex: ISTS) and click on START to perform the calibration. The calibration values will
now be stored inside the system and the reference mic will be turned off.
5. UNMUTE the hearing aid
6. Proceed with Real Ear Measurements.
The purpose of this process is to ensure that the REM system is not actively regulating the output of the
stimulus speaker. The reason why we want to disable this is because there is sound leakage from the Open
Fitting onto the REM headset’s reference microphone. Therefore the stimulus delivered is inaccurate. By
storing the distance from the speaker via this measurement the speaker can then stimulate according to
that fixed point. It is important to ensure the patient maintains their position during this type of
measurement.
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