Audioscan Verifit 2 - Manual (Page 77)

Verifit ® User's Guide Version 4.2 © June 2015
2. Select the WRECD coupling method that will be used on the ear. Audioscan software supports both
foam eartips and personal earmolds, however this choice must be made prior to measurement.
3. If no RECD calibration exists or the measurement interval has been exceeded, go to 15.3: Calibration of
WRECD transducer. If a valid transducer calibration exists, select [Measure real ear].
4. Couple a standard insert earphone foa m eartip to the nozzle of the WRECD transducer. If using an
earmold, seal any vent at its outer surface.
5. Refer to Positioning the probe tube and insert the probe tube into the ear canal to within 2 - 5 mm of the
eardrum.
6. Insert the foam tip or earmold into the ear, being careful not to advance the probe tube further into the ear
canal. Insertion depth should be as used with insert phones. Allow the foam tip to fully expand in the ear.
Insertion depth should be as used with insert phones.
7. Select to generate the real-ear response curve (magenta) and the WRECD curve (blue). If the WRECD
curve is negative and unstable in the low frequencies, check the seal of the foam tip. Increase the tip size
and/or apply a lubricant to the foam tip to improve the seal. If the WRECD curve deviates more than 10 dB
from the average in the 4 - 6 kHz region, check for proper probe placement and possible blockage of the tube
by the foam tip or cerumen.
8. When these curves are stable, select to save them.
For comparison purposes, the age-related average WRECD is shown as a dotted curve on the screen. If you have
accessed WRECD from the main menu, you may click the Age box to change the age for this reference curve.
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