HP RM500SL manual Recd real-ear to coupler difference, FastFacts 15.2 Recd facts

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15RECD (real-ear to coupler difference)

15.1Section overview

The RECD measurement procedure may be accessed by selecting RECD from the REM tests list or from the Audiometry poster within Speechmap. An optional RECD transducer is required for RECD measurements.

This section covers the following topics:

15.2: RECD facts

15.3: RECD coupler response

15.4: RECD real-ear response

15.5: RECD results

FastFacts 15.1: RECD (real-ear to coupler difference)

15.2 RECD facts

Individual RECD values are derived by comparing the real-ear SPL for a given test signal to the 2cc coupler SPL for the same test signal. These RECD values are used to: (1) convert HL threshold and UCL obtained using insert phones to SPL values, (2) simulate real-ear measurements from 2cc coupler measures (S-REM); and (3) derive 2cc coupler targets from real-ear aided targets.

If you use insert ear phones for audiometry OR if you verify using S-REM, you should measure RECD (preferred) or use age-related average RECD.

If you use headphones or sound field for audiometry AND you use REM for verification, RECD is not applied in any way and need not be measured.

If you use 2cc coupler targets, you should use measured or age-related RECD.

Insert phone audiometry with measured RECD and REM verification provides the best fitting accuracy, with S-REM verification being slightly less accurate. Insert phone HL data with age-related average RECD is next best.

This software provides average RECDs for 1 - 60 months, 6 - 10 years of age and Adult. A sampling of age-related foam-tip HA-2 RECD values is shown below.

Age/Freq	250	500	750	1000	1500	2000	3000	4000	6000

1 month	3	8	9	12	15	15	16	20	23

12 months	3	6	8	10	10	11	11	15	17

24 months	3	5	7	9	9	10	10	14	15

36 months	3	5	7	9	8	9	9	13	14

60 months	3	5	7	9	7	8	8	13	13

8 yrs - Adult	3	4	6	8	7	7	8	13	13

Values are from DSL 5.0 but differ from DSL in that values for 119 months have been used for ages >119 months. DSL 5.0 RECDs differ from DSL 4.1 RECDs.

FastFacts 15.2: RECD facts

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RM500SL User’s Guide Version 2.8

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Contents USER’S Guide Table of Contents General SetupGetting Started General OperationHearing Instrument Tests Setup Ansi S3.22 Hearing Aid TestsOther Hearing Instrument Tests REM Manual Control Speechmap Fitting Procedures TroubleshootingSpeechmap Technical Details About RM500SL Section overviewHelp is available on the following topics by pressing Help FastFacts 1.3 Electronic users guide Warranty, Trademarks, Acknowledgements FastFacts 1.4 Warranty, trademarks, acknowledgementsElectromagnetic Compatability EMC CisprFastFacts 2.1 Getting started Unpacking and connecting FastFacts 2.2 Unpacking and connectingGetting Started Following topics are covered in this sectionMicrophone connection FastFacts 2.3 Microphone connectionFastFacts 2.4 Microphone care Battery pill use and care FastFacts 2.5 Battery pill use and careMicrophone care Coupler microphone Probe microphoneMouse, keyboard, barcode scanner FastFacts 2.6 Mouse, keyboard, barcode scannerGeneral Operation External printer, auxiliary audio outputsFastFacts 2.7 External printer, auxiliary audio outputs Section overview This section covers the following topicsInput device operation Function KeypadFastFacts 3.2 Input device operation Barcode data input FastFacts 3.3 Barcode data inputKeypad keys Function Button FastFacts 3.4 Keypad keysMenus, lists and buttons Setup Box List Box FastFacts 3.5 Menus, lists and buttonsFastFacts 3.7 Program memory removal and replacement Screen messagesGeneral Setup FastFacts 4.1 General setup Date and time setupFastFacts 4.2 Date and time setup Software updatingDisplay settings FastFacts 4.3 Display settings Saving test setupFastFacts 4.4 Saving test setup Networking FastFacts 5.1 Networking Networking requirementsFastFacts 5.2 Networking requirements Networking setup FastFacts 5.3 Networking setupSingle computer connection On the RM500SL, seeFastFacts 5.4 Single computer connection Printing and Storing Results FastFacts 6.1 Printing and storing resultsInternal printer paper loading To load a new roll of paperFastFacts 6.2 Internal printer paper loading FastFacts 6.4 Local printer setup Barcodes, headers and comments on printoutsPrinting to a USB memory stick FastFacts 6.5 Printing to a USB memory stickNetwork printer setup FastFacts 6.6 Network printer setupPrinting to a network file FastFacts 6.8 Data storage to a network fileHearing Instrument Tests Setup FastFacts 7.2 HIT a or B display Graph or table formatFastFacts 7.3 Graph or table format Output or gain scale FastFacts 7.4 Output or gain scaleHide or Show HIT curves To change the averaging frequenciesFastFacts 7.7 Ansi test frequencies HIT calibration facts FastFacts 7.8 HIT calibration factsFastFacts 7.9 Calibration of HIT reference microphone Calibration check for coupler microphone FastFacts 7.10 Calibration check for coupler microphoneCoupling the hearing instrument Positioning the hearing instrument FastFacts 7.12 Positioning the hearing instrumentAnsi S3.22 Hearing Aid Tests FastFacts 8.2 Ansi S3.22-1996 factsAnsi S3.22-2003 facts Turn the instrument onFastFacts 8.4 Ansi 1996 Linear and AGC tests Ansi 2003 Linear and AGC tests FastFacts 8.5 Ansi 2003 Linear and AGC testsAnsi test results FastFacts 8.6 Ansi test resultsAnsi input-output curves FastFacts 8.7 Ansi input-output curvesAnsi telecoil terminology FastFacts 8.8 Ansi telecoil terminologyAnsi telephone simulator Tmfs test FastFacts 8.9 Ansi telephone simulator Tmfs testTelecoil test results FastFacts 8.10 Telecoil test resultsOther Hearing Instrument Tests Turn the hearing instrument onFastFacts 9.2 Harmonic distortion Multicurve procedure FastFacts 9.3 Multicurve procedure Multicurve resultsFastFacts 9.4 Multicurve results FastFacts 9.6 Battery drain test Spectral analysis in MulticurveManual control procedure FastFacts 9.8 Sound level meter using manual controlReal-Ear Measurement Setup FastFacts 10.2 REM calibration factsCalibration of REM probe microphone FastFacts 10.3 Calibration of REM probe microphoneCalibration check for probe module Max TM SPL setup FastFacts 10.5 Max TM SPL setup 10.6 ABR nHL to eHL setupFastFacts 10.6 ABR nHL to eHL setup Positioning the client FastFacts 10.8 Positioning the probe tubeREM Screen Setup FastFacts 11.3 Graph, table or 2cc target formatREM Manual Control SPL or HL scaleFastFacts 11.4 SPL or HL scale Hide or show REM curves FastFacts 11.5 Hide or show REM curvesFastFacts 12.3 Sound level meter using REM probe Manual control measurementsSensory Loss Simulator Sensory loss simulator descriptionFastFacts 13.2 Sensory loss simulator operation Occlusion Effect Test Occlussion effect measurementTurn the hearing aid OFF FastFacts 14.1 Occlusion effect measurementRecd real-ear to coupler difference FastFacts 15.2 Recd factsRecd coupler response FastFacts 15.3 Recd coupler responseRecd real-ear response Allow the foam tip to fully expand in the earFastFacts 15.4 Recd real-ear response Recd results FastFacts 15.5 Recd resultsInsertion Gain FastFacts 16.1 Insertion gain Insertion gain in SPLFastFacts 16.2 Insertion gain in SPL Insertion gain in HL FastFacts 16.3 Insertion gain in HLAudiometric data entry To enter data from a barcode see 3.3 Barcode data inputTo enter assessment data and parameters manually FastFacts 16.4 Audiometric data entryReur measurement procedure FastFacts 16.5 Reur measurement procedureRear measurement procedure FastFacts 16.6 Rear measurement procedureSII calculation in Insertion gain FastFacts 16.7 SII calculation in Insertion gainSpeechmap FastFacts 17.1 Speechmap 17.2 Speechmap factsFastFacts 17.2 Speechmap facts DSL 5.0 in Speechmap FastFacts 17.3 DSL 5.0 in SpeechmapDSL 5.0 changes FastFacts 17.4 DSL 5.0 changes NAL-NL1 in SpeechmapFastFacts 17.5 NAL-NL1 in Speechmap Using Speechmap FastFacts 17.6 Using SpeechmapTo enter audiometric data, see 18.2 Assessment data entry 0611 RM500SL User’s Guide Version REM or S-REM mode FastFacts 17.9 REM or S-REM mode17.10SII calculation in Speechmap FastFacts 17.10 SII calculation in SpeechmapSpeechmap Fitting Procedures To enter assessment data manuallyFastFacts 18.2 Assessment data entry Assessment data choices FastFacts 18.3 Assessment data choicesFrom 18.3 Assessment data choices FastFacts 18.4 Assessment data choicesFitting to targets for soft speech FastFacts 18.5 Fitting to targets for soft speechFitting to targets for loud sounds FastFacts 18.6 Fitting to targets for loud soundsFitting to targets for mid-level speech FastFacts 18.8 Open fittings in SpeechmapFM fitting and verification FastFacts 18.9 FM fitting and verificationSpeechmap Technical Details FastFacts 19.2 Speechmap stimuliStimulus levels FastFacts 19.3 Stimulus levelsMicrophone location effects Microphone Location Effects FastFacts 19.4 Microphone location effectsSpeech signal analysis FastFacts 19.5 Speech signal analysisTroubleshooting FastFacts 20.1 Troubleshooting Self test failuresFastFacts 20.2 Self test failures FastFacts 20.4 HIT curves inconsistent No HIT reference mic. detected FastFacts 20.7 No HIT reference mic. detectedInvalid HIT calibration Invalid HIT Calibration FastFacts 20.10 Invalid REM calibration20.11REM speaker overdriven FastFacts 20.12 Barcode scanner malfunctionTechnical Specifications Storage & TransportationGeneral HIT ChamberGlossary Page Page Page References Page Page 0611 RM500SL User’s Guide Version Verifit and RM500SL Test Signals and Analysis Test signalsIntroduction Broad-band signals Loud Vocal Effort Effect re nominal band SPL Analysis of broad-band signals Pink noise signal analysisVerifit / RM500SL Speechmap 07/05/06 Example of speech envelope and Ltass 07/05/06 Ltass for Speechmap speech signals at average vocal effort Ltass Dynamic