Presentations text content in 1 THE AUDIOMETER and TEST ENVIRONMENT
Slide1
1
THE AUDIOMETER and TEST ENVIRONMENT
HEARING CONSERVATION PROGRAM
28 Jan 2013
Slide2Learning Objectives
Describe the critical components of the audiology test environment
Identify the equipment required for audiology testingExplain required audiometer calibration and equipment checks
List infection control proceduresTroubleshoot temporary and permanent equipment problems
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Slide33
FOUNDATION of Accurate and
Valid Hearing Tests
is the1. Test Environment
2. Test Equipment
Test Environment
Test Equipment
Hearing
Test
Results
Slide4Equipment Used for Testing
Test boothAudiometer
Computer and data management software – DOEHRS-HC
Headphones/earphonesHand switch or response button
Artificial (electroacoustic) ear -- “Bio-Joe” --
or human listener with normal hearing4
Slide5Audiometric Sound Booths
5Sound Booths Sound treated
Nearly Sound Proof
Slide6Audiometric
Booth Certification Required annually
Performed by Industrial Hygienist
or Audiologist or trained
technician Decibel (dB) Levels
inside & outside booth
pierside
& underway
Displayed clearly
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Slide7Excessive Noise in Booth
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Slide8Excessive Noise Solutions
Repair and/or replace equipmentPatients remove jackets, electronic devices
OHC Technicians control talking and noise in test area
Change testing schedule due to
interference from exterior noise
Relocate test booth
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Slide9What is an Audiometer?
Electronic instrumentMeasures hearing sensitivityGenerates pure tone signals of known frequency and intensity
Manual
Audiometer
MicroprocessorAudiometer
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GSI 61 Audiometer
Benson Medical Inc
CCA-200 mini
Slide10Audiometers Used by
OHC TechnicianMICROPROCESSOR
Software controls testingPatient controls stimulus
Tests 1-8 patientsAutomatic STS calculations
MANUAL
Examiner controls testing
Examiner controls stimulus
Tests 1 patient
Manual calculations of STS
Continued….
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Slide11MICROPROCESSOR
Prints forms : 2215, 2216, Non HC, 2217 Data uploaded to central data repository
Semi-manual capability
Requires maintenance, software upgrades, data backup, calibration
MANUAL
Manual audiograms
Data transcribed into computer database before upload
Manually operated
Requires maintenance and calibration
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Slide12Three Coordinated Systems
Testing - Storing - Collecting
Defense Occupational & E
nvironmental H
ealth Readiness S
ystem -- Hearing
C
onservation or
D
ata
R
epository
DOEHRS-HC
Hearing
Conservation
COLLECTS
demographic
and hearing test data
(1-8 patients)
DOEHRS-DR
Data
Repository
STORES
demographic & hearing data worldwide
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CCA-200
Microprocessor Audiometer
PERFORMS
hearing test
RETRIEVES
data from
DOEHRS-HC
Slide13Other System Components
Electroacoustic Simulator (“Bio-Joe”)Verifies calibration status of audiometer
Attached to audiometer for Biological Calibration check
Headphones or Earphones
Calibrated with an audiometer as unitSwapping headphones changes calibration
Must be repaired together
Hand switch
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Slide14Testing
Equipment Checks14
Slide1515
Slide16Functional Listening Check
Daily hands-on check of hardware
Visually check equipment
earphone headband tension
earphone cushions and diaphragms cords, connections and response button
Listen to pure tones through headphones
frequency and intensity changes
tone quality
crosstalk and static
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Slide17Daily Biologic Calibration Check
Verifies calibration values of audiometer (Day 2-365) have not changed significantly from (Day 1) baseline
Performed daily before first employee is tested
Bio-Joe should be used as primary calibrator normal hearing listener acceptable; as secondary
Bio-Joe thresholds range from 60 - 80 dBHL
Permitted deviations from initial baseline values
± 5 dB at 500-4000 Hz
± 10 dB at 6000 Hz
DD 2217 form established as legal record;
maintained for 5 years
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Slide18Daily Biologic Calibration Check #2
If audiometer fails calibration
check all connections check placement & condition of earphones repeat calibration check
Use alternate listener if problem persists
If audiometer fails calibration with 2nd listener
send out for repair (with earphones) use backup audiometer if available
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Slide19Causes for
Failed Calibration CheckImproper earphone placement
Poor connections at jack panel or to audiometerWorn out or flattened earphones
Annual electroacoustic calibration expired
Malfunctioning artificial ear (Bio-Joe)Malfunctioning audiometer
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Slide20Audiometer Care and
End of Day ProceduresClean earphones & cords
(if not done in a.m.)Hang earphones on hook – NOT on Bio-Joe
Back up
audiometric data on external driveExport audiometric data to DOEHRS-DR daily
Completely shut down system to prevent
data corruption
(before CAC removal)
Store or dispose of employee data
re: HIPAA regulations
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Slide21Infection Control Procedures
Objects touch . . . blood, mucous, ear drainage, cerumen
, other bodily fluidsClean and
sterilize after each useProbe tips for tympanometry
Otoscope speculae
(non-disposable)Ear gauges
Critical Equipment
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IF
THEN
Slide22Infection Control Procedures …
Non-Critical EquipmentClean and Disinfect
disposable germicidal pre-moistened wipeshospital grade disinfectant
HeadphonesHeadbands
Response buttonsEnvironmental surfaces
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Slide23SUMMARY
FOUNDATION of Accurate Valid
Hearing Tests Quiet Environment
Calibrated Working
Equipment
Equipment
Test Environment
Hearing Test
Results
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Slide24QUESTIONS?
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1 THE AUDIOMETER and TEST ENVIRONMENT
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