HP RM500SL - Manual (Page 54)

0611 RM500SL User’s Guide Version 2.8 Page 54
10.7 Positioning the client
FastFacts 10.7: Positioning the client
10.8 Positioning the probe tube
FastFacts 10.8: Positioning the probe tube
Sound reflections from nearby surfaces (including the operator) can cause large
measurement errors. 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 speaker at least
1.5 m (5 feet) away from any hard surfaces.
2) The speaker mounted in the lid of the test chamber is used for real-ear
measurements. It is normally used with the lid in a near-vertical position but the
elevation may be changed by opening the lid past vertical.
3) Position the client directly in front of, and facing, the front REM speaker at a
distance of 18” to 36” (45 to 90 cm) from the center of the head. The speaker
and the head should be at approximately the same level.
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.