Affinity
2.0
Additional Information Page 161
2.6.4.1 Calibrate for Open Fit
Calibrate for open fit is the best way to cope with open fittings. Calibrate for open fit is done with the hearing
aid in place muted or switched off.
During a stimulus presentation the reference microphone supervises the amplitude of the signal. It records
how much of the signal leaks out of the ear canal at each frequency and adjusts the input level accordingly.
This keeps the input at the correct level across the frequency range.
After the measurement is done the reference microphone switches off.
The adjustments across the frequency range will now be remembered and used as correction values for the
following aided Real-Ear Measurements.
Since the reference microphone does not monitor the input level anymore the client MUST avoid
movements during the aided Real-Ear Measures. If movements occur precision is compromised and the
measures will not be accurate.
Note: Calibrate for Open Fit can be added as a part of the individual test protocol in the REM440 setup the
same way that other tests are added (see section 2.6).
Calibrate for open fit procedure:
1. Select Calibrate for open fit in the main screen.
2. Carefully insert the hearing aid without changing the position of the probe tube.
3. Press START and follow the instructions in the pop-up. Ensure that it is MUTED/switched off!
4. Press OK to continue with the measure.
The visual appearance of Calibrate for open fit will differ depending on the selected stimulus.
Measurements performed after Calibrate for open fit needs to be performed with the same stimulus as was
used in Calibrate for open fit. However, you can now do multiple Calibrate for open fits. After performing
these, only the stimuli that have been used for the Calibrate for open fits are selectable for the aided
measures (E.g. REIG, REAR).
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