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Verifit User’s Guide Version 2.8
Page 61
10.8 Positioning the client
FastFacts 10.8: Positioning the client
10.9 Positioning the probe tube
FastFacts 10.9: Positioning the probe tube
Sound reflections from nearby surfaces (including the operator) can cause large
measurement errors, especially if the client moves between REUR and REAR
measurements. Room noise can increase test time, cause errors and alter the
operation of the hearing instrument being evaluated.
1)
Choose a quiet location and position the client and the real-ear speakers at
least 1.5 m (5 feet) away from any hard surfaces.
2)
Position the client directly in front of, and facing, the front REM speaker at a
distance of 45 to 90 cm (18” to 36”) from the center of the head.
3)
Position the back speaker (if used) directly behind and facing the back of the
client’s head so that front and rear speakers are at the same height and are at
the same distance from the center of the client’s head.
1)
Use an otoscope to ensure there is no ear canal obstruction (e.g. cerumen) and
to get a sense of ear canal length.
2)
Install a new probe tube on the probe module. Set the black marker ring
approximately 28 mm from end of probe tube for adult females, approximately
30 mm from end of probe tube for adult males and approximately 20-25 mm
from end of probe tube for children. These positions may be modified based on
the otoscopic examination. (Tip - the probe module body is 28 mm long.)
3)
Hang the probe module on the ear, as
shown.
The reference microphone
should face outwards
.
4)
Adjust the blue cord until the probe module
is snug against the head, directly below the
earlobe (cheek level). To facilitate this, clip
the probe module cable to clothing on the
side opposite the test ear and draw the
cable snug.
5)
Hold the front blue cord so that it passes
behind the ear canal entrance and pass
the end of the probe tube in
front
of the
blue cord and into the ear canal.
6)
Carefully slide the probe tube into the ear
canal until the marker ring approaches the
intertragal notch. Then let the front blue
cord move forward to hold the probe tube
in place.
Use an otoscope to verify that
the tube is 2 to 5 mm from the eardrum.
