HP RM500SL manual FastFacts 20.4 HIT curves inconsistent

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20.3 HIT high distortion or noise

High distortion and/or noise numbers in an ANSI test

vThere may be a leak between the hearing instrument under test and the coupler it is connected to. For BTE type instruments, check the integrity of the #13 tubing at the end of the coupler where it joins with the ear hook. Look for cracks. ITE type instruments need to have a good seal between the hearing instrument and the coupler. In addition, all vents need to be closed from the faceplate side of the hearing instrument.

vAmbient room noise may be leaking into the test chamber. Air conditioners, computer fans and similar noisemakers can yield artificially high noise figures. Check the sealing of the test chamber. Try turning off suspected noise sources to identify the cause.

vVibration may be coupled into the test chamber from other equipment on the same table or wooden floor. Computers, fans and air conditioners may be the source of the vibration. Try turning off suspected sources to identify the cause. Relocate the source or the RM500SL or mount it on a foam pad.

FastFacts 20.3: HIT high distortion or noise 20.4 HIT curves inconsistent

The HIT curves keep changing from test to test.

vThe battery may be close to end of life or starved for air (zinc-air cells) because of a tight seal on the battery compartment. Try a fresh battery or using the optional RM500SL battery pill.

vThe HIT reference microphone (the white one in the test chamber) is incorrectly positioned. In order to control sound pressure levels precisely at the microphone inlet of the hearing instrument, the HIT reference microphone must be positioned as close as possible to the hearing instrument’s microphone without actually touching it.

vThe noise or feedback reduction features are attempting to reject the test signal. These need to be disabled prior to tests with tones or noise.

vThe instrument is on the verge of feedback due to a poor seal to the coupler, unplugged vent or a crack in the tubing on the BTE coupler.

FastFacts 20.4: HIT curves inconsistent

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RM500SL User’s Guide Version 2.8

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Contents USER’S Guide General Setup Table of ContentsGetting Started General OperationOther Hearing Instrument Tests Hearing Instrument Tests SetupAnsi S3.22 Hearing Aid Tests REM Manual Control Speechmap Technical Details Speechmap Fitting ProceduresTroubleshooting Help is available on the following topics by pressing Help About RM500SLSection overview FastFacts 1.3 Electronic users guide FastFacts 1.4 Warranty, trademarks, acknowledgements Warranty, Trademarks, AcknowledgementsCispr Electromagnetic Compatability EMCFastFacts 2.2 Unpacking and connecting FastFacts 2.1 Getting started Unpacking and connectingGetting Started Following topics are covered in this sectionFastFacts 2.3 Microphone connection Microphone connectionFastFacts 2.5 Battery pill use and care FastFacts 2.4 Microphone care Battery pill use and careMicrophone care Coupler microphone Probe microphoneFastFacts 2.6 Mouse, keyboard, barcode scanner Mouse, keyboard, barcode scannerExternal printer, auxiliary audio outputs General OperationFastFacts 2.7 External printer, auxiliary audio outputs Section overview This section covers the following topicsFastFacts 3.2 Input device operation Input device operationFunction Keypad FastFacts 3.3 Barcode data input Barcode data inputFastFacts 3.4 Keypad keys Keypad keys Function ButtonFastFacts 3.5 Menus, lists and buttons Menus, lists and buttons Setup Box List BoxScreen messages FastFacts 3.7 Program memory removal and replacementFastFacts 4.1 General setup Date and time setup General SetupFastFacts 4.2 Date and time setup Software updatingFastFacts 4.4 Saving test setup Display settingsFastFacts 4.3 Display settings Saving test setup FastFacts 5.2 Networking requirements NetworkingFastFacts 5.1 Networking Networking requirements FastFacts 5.3 Networking setup Networking setupFastFacts 5.4 Single computer connection Single computer connectionOn the RM500SL, see FastFacts 6.1 Printing and storing results Printing and Storing ResultsFastFacts 6.2 Internal printer paper loading Internal printer paper loadingTo load a new roll of paper Barcodes, headers and comments on printouts FastFacts 6.4 Local printer setupFastFacts 6.5 Printing to a USB memory stick Printing to a USB memory stickFastFacts 6.6 Network printer setup Network printer setupFastFacts 6.8 Data storage to a network file Printing to a network fileFastFacts 7.2 HIT a or B display Graph or table format Hearing Instrument Tests SetupFastFacts 7.3 Graph or table format Output or gain scale FastFacts 7.4 Output or gain scaleFastFacts 7.7 Ansi test frequencies Hide or Show HIT curvesTo change the averaging frequencies FastFacts 7.8 HIT calibration facts HIT calibration factsFastFacts 7.9 Calibration of HIT reference microphone FastFacts 7.10 Calibration check for coupler microphone Calibration check for coupler microphoneCoupling the hearing instrument FastFacts 7.12 Positioning the hearing instrument Positioning the hearing instrumentFastFacts 8.2 Ansi S3.22-1996 facts Ansi S3.22 Hearing Aid TestsFastFacts 8.4 Ansi 1996 Linear and AGC tests Ansi S3.22-2003 factsTurn the instrument on FastFacts 8.5 Ansi 2003 Linear and AGC tests Ansi 2003 Linear and AGC testsFastFacts 8.6 Ansi test results Ansi test resultsFastFacts 8.7 Ansi input-output curves Ansi input-output curvesFastFacts 8.8 Ansi telecoil terminology Ansi telecoil terminologyFastFacts 8.9 Ansi telephone simulator Tmfs test Ansi telephone simulator Tmfs testFastFacts 8.10 Telecoil test results Telecoil test resultsFastFacts 9.2 Harmonic distortion Other Hearing Instrument TestsTurn the hearing instrument on FastFacts 9.4 Multicurve results Multicurve procedureFastFacts 9.3 Multicurve procedure Multicurve results Spectral analysis in Multicurve FastFacts 9.6 Battery drain testFastFacts 9.8 Sound level meter using manual control Manual control procedureFastFacts 10.2 REM calibration facts Real-Ear Measurement SetupFastFacts 10.3 Calibration of REM probe microphone Calibration of REM probe microphoneCalibration check for probe module FastFacts 10.6 ABR nHL to eHL setup Max TM SPL setupFastFacts 10.5 Max TM SPL setup 10.6 ABR nHL to eHL setup FastFacts 10.8 Positioning the probe tube Positioning the clientFastFacts 11.3 Graph, table or 2cc target format REM Screen SetupSPL or HL scale REM Manual ControlFastFacts 11.4 SPL or HL scale Hide or show REM curves FastFacts 11.5 Hide or show REM curvesManual control measurements FastFacts 12.3 Sound level meter using REM probeFastFacts 13.2 Sensory loss simulator operation Sensory Loss SimulatorSensory loss simulator description Occlussion effect measurement Occlusion Effect TestTurn the hearing aid OFF FastFacts 14.1 Occlusion effect measurementFastFacts 15.2 Recd facts Recd real-ear to coupler differenceFastFacts 15.3 Recd coupler response Recd coupler responseFastFacts 15.4 Recd real-ear response Recd real-ear responseAllow the foam tip to fully expand in the ear FastFacts 15.5 Recd results Recd resultsFastFacts 16.2 Insertion gain in SPL Insertion GainFastFacts 16.1 Insertion gain Insertion gain in SPL FastFacts 16.3 Insertion gain in HL Insertion gain in HLTo enter data from a barcode see 3.3 Barcode data input Audiometric data entryTo enter assessment data and parameters manually FastFacts 16.4 Audiometric data entryFastFacts 16.5 Reur measurement procedure Reur measurement procedureFastFacts 16.6 Rear measurement procedure Rear measurement procedureFastFacts 16.7 SII calculation in Insertion gain SII calculation in Insertion gainFastFacts 17.2 Speechmap facts SpeechmapFastFacts 17.1 Speechmap 17.2 Speechmap facts FastFacts 17.3 DSL 5.0 in Speechmap DSL 5.0 in SpeechmapFastFacts 17.5 NAL-NL1 in Speechmap DSL 5.0 changesFastFacts 17.4 DSL 5.0 changes NAL-NL1 in Speechmap To enter audiometric data, see 18.2 Assessment data entry Using SpeechmapFastFacts 17.6 Using Speechmap 0611 RM500SL User’s Guide Version FastFacts 17.9 REM or S-REM mode REM or S-REM modeFastFacts 17.10 SII calculation in Speechmap 17.10SII calculation in SpeechmapFastFacts 18.2 Assessment data entry Speechmap Fitting ProceduresTo enter assessment data manually FastFacts 18.3 Assessment data choices Assessment data choicesFastFacts 18.4 Assessment data choices From 18.3 Assessment data choicesFastFacts 18.5 Fitting to targets for soft speech Fitting to targets for soft speechFastFacts 18.6 Fitting to targets for loud sounds Fitting to targets for loud soundsFastFacts 18.8 Open fittings in Speechmap Fitting to targets for mid-level speechFastFacts 18.9 FM fitting and verification FM fitting and verificationFastFacts 19.2 Speechmap stimuli Speechmap Technical DetailsFastFacts 19.3 Stimulus levels Stimulus levelsFastFacts 19.4 Microphone location effects Microphone location effects Microphone Location EffectsFastFacts 19.5 Speech signal analysis Speech signal analysisFastFacts 20.2 Self test failures TroubleshootingFastFacts 20.1 Troubleshooting Self test failures FastFacts 20.4 HIT curves inconsistent FastFacts 20.7 No HIT reference mic. detected No HIT reference mic. detectedFastFacts 20.10 Invalid REM calibration Invalid HIT calibration Invalid HIT CalibrationFastFacts 20.12 Barcode scanner malfunction 20.11REM speaker overdrivenStorage & Transportation Technical SpecificationsGeneral HIT ChamberGlossary Page Page Page References Page Page 0611 RM500SL User’s Guide Version Introduction Verifit and RM500SL Test Signals and AnalysisTest signals Broad-band signals Loud Vocal Effort Effect re nominal band SPL Pink noise signal analysis Analysis of broad-band signalsVerifit / 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