HP RM500SL manual Recd real-ear response, Allow the foam tip to fully expand in the ear

15.4 RECD real-ear response

Connect the RECD transducer to the RECD jack to the left of the test chamber. Prepare the system for REM tests. See 10.3: Calibration of REM probe microphone.

2)Press <Tests> then highlight and <PICK> [RECD] from the REM tests list.

3)If no coupler response exists or the measurement interval has been exceeded, go to 15.3:RECD coupler response.

4)If a valid coupler response exists, highlight and <PICK> [Measure real ear].

5)Refer to 10.8: 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 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.

7)Press <Continue> to generate the real-ear response curve (pink) and the RECD curve (cyan). If the RECD 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 RECD 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, press <Continue> to save them.

For comparison purposes, an age-related average RECD is shown as a dotted curve on the screen. If you have accessed RECD from the REM tests list, you may highlight and <PICK> the Age box to change the age for this reference curve.

FastFacts 15.4: RECD real-ear response

0611 RM500SL User’s Guide Version 2.8 Page 62