HP RM500SL manual Positioning the client, FastFacts 10.8 Positioning the probe tube

10.7 Positioning the client

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.

FastFacts 10.7: Positioning the client 10.8 Positioning the probe tube

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.

FastFacts 10.8: Positioning the probe tube

0611 RM500SL User’s Guide Version 2.8 Page 54