HP RM500SL - Manual (Page 62)

0611 RM500SL User’s Guide Version 2.8 Page 62
15.4 RECD real-ear response
FastFacts 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 then highlight and
[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
[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 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 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 the Age box to change the age for this reference curve.