Daily Listen Checks and Calibration flashcards |

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-A DLC is when the clinician checks all the audiological equipment before testing a patient.
-Should be performed on all patients

Purpose of Daily Listen Checks?

• Save time
• If there is problem with the equipment, we would like to fix it or find a solution BEFORE the patient is seen
• Ensure that test results obtained are accurate
• Is the person not responding because they have a HL or is it
because our equipment isn't functioning?
• RED FLAGS: Asymmetrical HL, No response in soundbooth but patient can hear just fine in person.
• Professionalism

How do we run a daily listening check?

-You will need a partner to be in the sound booth. --First check, air conduction testing while using the headphones.
-The person in the booth should be able to hear the signal at each frequency (250-8000 Hz).
-Next, use the bone oscillator and to the same.
-Finally check sound field speakers.
-There is a checklist in the booths


Device that measures the immittance of the middle ear system, or how well the middle ear is functioning.

A Tympanometer includes...

• Tympanometry
• Acoustic Reflexes
• Acoustic Reflex Decay
• Eustachian Tube Function

Basic parts of a Tympanometer

• Immittance Bridge or the "Box" - holds the probe and stimulus tubes
• Probe tips - placed on the end of the probe, come in different sizes (adult - pediatric)

How do we run a daily listening check on a tympanometer?

• 1. You can check your own ear and should see normal
• 2. Use a 2 cc. Coupler that is in the clinic. You should see a volume of 2ml.

Otoacoustic Emmission (OAEs)

Device that tests the outer hair cell function of a person. You put a probe that plays an sound into each ear.
• Can be software installed on a computer
• Can be a handheld screener

How do we run a daily listening check on a OAEs?

Check BOTH ears!

• Make sure you can hear sounds playing out of each ear.
• If you have normal hearing you should have present OAEs

Daily listen checks for hearing screenings

always perform a listening check on the screening audiometer before taking it out of the clinic


•International Organization for Standardization (ISO)
•International Electrotechnical Commission (IEC): showing electronically it won't hurt anyone
•American National Standard Specification for Audiometers (ANSI): depending on the class of audiometers they are putting out the same thing
•Acoustical Society of America (ASA)
•ASHA: require that if we take out a portable audiometer we fill out checklist and it needs to be completed before you screen (ANSI and licensure board require the same)
•Texas Requirements: fill out green cards
•On the General Audiometer Checklist (Ideally all should be checked "no" but #12 should be checked "yes.")
•Required to check the Audiometers.

Parts of an audiometer

•Attenuator- intensity dial
•Frequency selector- lets you change the Hz you're testing
•Talk over dial
•Talk back dial
•VU meter- for speech

Types of Transducers

•Standard (regular headphones)
•Inserts (makes sound louder so you have to adjust for that)
•High freq. or Supra-aural headphones (whole ear is inside & lets us test 8K Hz)
•Sound field (height, distance, and locations matter in terms of calibration)
•Bone oscillator (calibrated on forehead or mastoid)

Parts of speech audiometer

•External inputs
•VU meter
•Talk over/talk back

Microphone caliration

Has to be calibrated to each voice, use VU meter and strive for 0. Adjust while giving instructions

External inputs calibration

-Tape players, CDs, iPods, MP3s.
-Must be calibrated daily.
-Tones usually played at a 1000 Hz, but you need to adjust the tone at 0 on the VU meter.

VU meter calibration

-If you listen/use the microphone, it has to be calibrated through your voice. Strive to be right at 0.
-Works for your voice and external inputs

Talk over

my voice; make sure it's not turned up all the way; so pt. hears you

Talk back

pt's voice; to hear them

Types of Audiometers: 1-4

-1 is the best for diagnostics. Has all inputs
-4 is pure tones. NO speech, best for hearing screenings.
-Some may be able to turn up louder than they are calibrated for, so always check

Types of Audiometer: channels

-Internal components that let you take a particular signal, specifically pure tone, control the frequency and you can handle ears separately with 2 channels
-1 Channel: can only use one transducer at a time
-1 ½ Channels: let's you do some things at the same time; just can't do two different transducers
-2 Channel: very expensive; handles ears complete separately

Types of Audiometers: A-C

-Type A: (the best) let's you do anything (i.e. microphone, CD) for speech testing.
-Type C: limited options (maybe a tape); least amount of speech ability

What type of audiometer do we usually take to schools?


Calibration of audiometers

•To ANSI standards
•Annually → most people hire a company to calibrate
•Quarterly →only if we test in noisy environments, only for OSHA
•Monthly→ booths
•Daily checks → we do this if we are the 1st person in the clinic

Parts of an Immittance Bridge

•Probe (3 holes)- mic, pressure, sound generator
•Daily Check- cavities (if volume off, could be holes), shelf-check

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