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Operation Manual
Operation Manual
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Pediatric Audiometer PA5
Valid from serial 01
80691221 – 09/2009
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Operation Manual
PA5 Operation Manual Page 1
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Operation Manual
Table of Conten ts
Table of Contents ............................................................................. 1
Introduction ....................................................................................... 2
Intended Use ............................................................................ 2
Precautions ............................................................................... 2
Warranty ................................................................................... 4
Basic Functions ................................................................................ 6
Description of Control Panel ..................................................... 6
Description of Stimuli Panel ..................................................... 7
Batteries ............................................................................................ 8
Replacing Batteries .................................................................. 8
Approximate Battery Lifetime ................................................... 8
Auditory Behaviour .......................................................................... 9
Auditory Behaviour -Test Overview .......................................... 9
Description of Various Tests .................................................. 10
Auditory Behaviour Index for Infants ...................................... 11
Reflex Audiometry by Neonates ............................................. 12
Maturation of Auditory Response ........................................... 12
Technical Specification s ................................................................ 15
Unpacking / Inspection .................................................................. 17
Contents of Shipment ............................................................. 17
Reporting Imperfections ......................................................... 18
Trouble Shooting ............................................................................ 19
Recommended Literature .............................................................. 20
Appendix: General Maintenance Procedures ............................. 21
Return Report .................................................................................. 23
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Operation Manual
Introduction
Intended Use
The PA5 handheld paediatric screening audiometer is designed to
be a device for screening for hearing loss primarily amongst children.
Output and specificity of this type of device are based on the test
characteristics defin ed b y the user, and m a y var y depend ing on
environmental and operating conditions. The screening for hearing
loss using this kind of audiometer depends on the interaction with the
patient. However, for children not responding well, various test
possibilities allow the tester of having at least some evaluative result.
Thus, a “normal hearing” result should not allow for ignoring other
contra indications in this case. A full audiologic evaluation should be
administered if concerns about hearing sensitivity persist.
Precautions
Be sure to use only stimulation intensities,
which will be acceptable for the patient.
The transducers (headphones, bone
conductor, etc.) supplied with the instrument
are calibrated to this instrument - exchange of
transducers require a recalibration.
WARNING indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE is used to address practices not
related to personal injury
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Operation Manual
It is recommended that parts which are in
direct contact with the patient (e.g. earphone
cushions) are subjected to standard disinfecting procedure between
patients. This includes physically cleaning and use of a recognised
disinfectant. Individual manufacturer's instruction should be followed
for use of this disinfecting agent to provide an appropriated level of
cleanliness.
Always remove the batteries when the
instrument is left unused for more than a
month.
Although the instrument fulfils the relevant
EMC requirements precautions should be
taken to avoid unnecessary exposure to
electromagnetic fields, e.g. from mobile phones etc. If the device is
used adjacent to other equipment it must be observed that no mutual
disturbance appears.
Electric and electronic waste may contain
hazardous substances and therefore has to be
collected separately. Such products will be
marked with the crossed-out wheeled bin shown below. The
cooperation of the user is important in order to ensure a high level of
reuse and recycling of electric and electronic waste. Failing to
recycle such waste products in an appropriate way may endanger
the environment and consequently the health of human beings.
Disposal of batteries must be made according to national
regulations.
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Operation Manual
Warranty
INTERACOUSTICS warrants that:
• The TBS25 is free from defects in material and workman
ship under normal use and service for a period of 12
months from the date of delivery by Interacoustics to the
first purchaser.
• Accessories are free from defects in material and
workmanship under normal use and service for a period
of ninety (90) days from the date of delivery by
Interacoustics to the first purchaser.
If any product requires service during the applicable warranty
period, the purchaser should communicate directly with the local
Interacoustics service centre to determine the appropriate repair
facility. Repair or replacement will be carried out at Interacoustics’
expense, subject to the terms of this warranty. The product
requiring service should be returned promptly, properly packed,
and postage prepaid. Loss or damage in return shipment to
Interacoustics shall be at purchaser's risk.
In no event shall Interacoustics be liable for any incidental,
indirect or consequential damages in connection with the
purchase or use of any Interacoustics product.
This shall apply solely to the original purchaser. This warranty
shall not apply to an y subsequent owner or holder of the produc t.
Furthermore, this warranty shall not apply to, and Interacoustics
shall not be responsible for, any loss arising in connection with
the purchase or use of any Interacoustics product that has been:
• repaired by anyone other than an authorized
Interacoustics service representative;
• altered in any way so as, in Interacoustics judgement, to
affect its stability or reliability;
• subject to misus e or negligence or accident, or which has
had the serial or lot number altered, effaced or removed;
or
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Operation Manual
• improperly mainta ined or used in any manner other than
in accordance with the instructions furnished by
Interacoustics.
This warranty is in lieu of all other warrant ies, express or im plied,
and of all other obligations or liabilities of Interacoustics, and
Interacoustics does not give or grant, directly or indirectly, the
authority to any representative or other person to assume on
behalf of Interacoustics any other liability in connection with the
sale of Interacoustics products.
INTERACOUSTICS DISCLAIMS ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FOR FUNCTION OF FITNESS FOR A
PARTICUL AR PURPOSE OR APPLI C AT I ON .
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Operation Manual
Basic Functions
Description of Control Panel
Indication of stimul u s mode: Indication
LEDs informing the user of the present
stimulus mode: Tone, NB or WN.
Light:
Light button to switch on the three red
LEDs, which are arranged in a triangle
above the speaker in order to condit ion the
orientation reflex.
Stimulus:
Stimulus button to present the selected
stimulus Tone, NB or WN.
Select:
Select button to select between the three
different stimuli Tone, NB or WN.
Intensity dB HL:
With the intensity control switch intensities
between 20 and 80 dB HL can be selected
in steps of 10 dB when the distance
between the ear and the loudspeaker is 50
cm.
The PA5 is switched off by leaving the
intensity control switch in the “Off” position.
Frequency kHz:
With the frequency control switch it is
possible to select between the following
frequencies: 0.5, 1, 2, 3, and 4 kHz.
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Description of Stimuli Panel
Loudspeaker:
The loudspeaker is to be found
underneath the black grid. When used
the grid should be positioned in a
distance of 50 cm (20 inches) from the
ear in order to obtain the intensities
printed on the Control Panel.
LEDs:
Three LEDs arranged in a triangle for
conditioning of the orientation reflex.
Headphone Connector:
Connector for single Headphone
TDH39S (optional). When the
headphone is connected P A5 wil l
automatically go to Pure Tone
stimulation and correct calibration for
Pure Tone Audiometr y with TD H39S wil l
be applied.
The connector is a 3.5 mm stereo Jack.
Pin assignment:
Tip = Not used
Ring = Signal
Sleeve = Signal
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Batteries
Replacing Batteries
To replace old batteries unscrew the small black lid in the narrow
end of PA5 and the batteries can be removed. Replace with three
new AA batteries. When ins erting the ne w batt eries please make
sure that they are inserted correctly according to the small drawing in
the bottom part of the control panel.
PA5 contains 3 batteries, size LR6, AA or Mignon. Alkaline or
rechargeable (NiMH or NiCa).
Approximate Battery Lifetime
The battery lifetime using alkaline battery type:
With the instrument switched off: 12 months
With 80 dB tone switched on: 10 hours
With 80 dB tone and light switched on: 4 hours
Battery Level indication:
When the batteries need to be replaced the LED indication for
the present used stimulus will gradually reduce in light
intensity and finally switch off.
Note: Always remove the batteries when the instrument is left
unused for more than a month.
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Auditory Behaviour
Auditory Behaviour -Test Overview
Waking
up
Respiration
Aud.
APR
COR
VRA
Recommended
age group
(month)
0 - 3
0 - 4
0 - 12
4 - 15
6 - 30
Preferred
Frequency:
500 Hz
x x
1000 Hz
x x
2000 Hz
x x x x
3000 Hz
x
x
x x x
4000 Hz
x
x
x x x
Tone Duration
(Sec)
1.5-2 1-2
0.5–1
0.5–1
0.5-1
Time between
Stimulation (sec)
30 20
10-20
10-20
10
MRL1 (sound
cabin) (dBHL)
40-80
40-80
40-80
30-60
20-40
Distance to test
ear (cm)
10-50
10-50
10-50 50-100 50-100
Condition of
child:
- sleeping
x x
- half asleep
x
x
x
- awake
x x x
- playing
(x)
(x)
- playing alert
x x
Recom. no. of
PA5s for the test:
1
1
1
2
2
1
MRL: Minimum Response Level (Matkin 1977).
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Description of Various Tests
As found by Professor Sanford E. Gerber complex signals like White
Noise (WN) assure better responsiveness on neonates and up to the
age of approximately seven months than e.g. pure tones and Narrow
Band Noise. Therefore PA5 has the possibility of stimulating with
WN.
The AP R Test:
The Auropalpebral Reflex is a startle reflex of the eyelid
elicited by relatively strong sounds, approximately 80 - 100 dB
SPL (PA5 is calibrated in dB HL).
The test can be performed on neonates from the day of birth
and it is not based on co-operation with the newborn child.
Other responses than the APR can be arousal from sleep,
crying or diminished acti vit y.
The COR Test:
The Paediatric Audiometer PA5 can perform Conditioned
Orientation Audiometry based on a technique described by
Suzuki and Ogiba (1961). The phenomenon called
“Orientation Reflex” is not a learned response, but a natural
reflex movement elicited by sound or visual stimulation.
If the visual stimulation elicits a reflex which is conditioned by
a tone, the child will look towards the visual stimulation, e.g.
flashing light, as soon as the tone is heard. If the conditioning
is effective the child will look in the direction of the sound
source even before the visual stimulation is presented. The
COR method requires cooperation from the child.
The VRA Test:
The Paediatric Audiometer PA5 can perform the Visual
Reinforcement Audiometry (Liden and Kankunen, 1969),
which is an extension and modification of COR, where the cooperation with the child is less important. Liden and Kankunen
accept not only the sound localisation orientation reflex, but
also four other reactions: reflex reactions (body and face),
search reactions, orientation reactions and spontaneous
reactions.
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Auditory Behaviour Index for Infants
Age
Reaction on
noisemaker
(approx.
dB SPL)
Reaction
on warbled
pure tones
(dB HL)
Reaction
on Speech
(dB HL)
Expected
Response
0–6 weeks
50-70 dB
78 dB (+ 6)
40-60 dB
Eye-widening,
eye-blink, stirring
or arousal from
sleep, startle.
6-16 weeks
50-60 dB
70 dB (+ 10)
40 dB (+ 2)
Eye-widening,
eye-shift, eye
blink, quieting:
beginning
rudimentary
head turn by four
month.
4-7 months
40-50 dB
51 dB (+ 9)
21 dB (+ 8)
Head turn on
lateral plane
towards sound:
listening attitude.
7-9 months
30-40 dB
45 dB (+ 15)
15 dB (+ 7)
Direct
local isation of
sounds to side,
indirectly below
ear level.
9-13 months
25-30 dB
38 dB (+ 8)
8 dB (+ 7)
Direct
local isation of
sounds to side,
directly below
ear level
indirectly above
ear level
13-16 months
25-30 dB
32 dB (+ 10) 5 dB (+ 5)
Direct
local isation of
sounds.
16-21 months
25 dB
25 dB (+ 10)
5 dB (+ 1)
Same.
21-24 months
25 dB
26 dB (+ 10)
5 dB (+ 2)
Same.
Stimulus as
PA5
(From Northern and Downs: Hearing in Children) Copyright © 1974 the
Williams and Wilkins company. By permission of publisher and author).
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Reflex Audiometry by Neonates
The reflex pattern elicited by sound can be divided into the following
types of reflexes (Relke and Frey 1966). The sound intensity is 75 –
90dB.
Breathing Reflex
The breathing rhythm is changing when the sound is heard
and should stabilise after 5-10 seconds.
Auropalpebral Reflex (APR)
The open eyelids will be closed fast and clear.
Moving Reflex
The neonatal child will move heavily after a quiet period.
Crying Reflex (Scream)
The face of the child will indicate discomfort and shortly after
followed by weeping or a scream.
Astonishment Reflex
Crying and body movements stop momentarily as if the child is
asking: “What is going on”?
Waking up Reflex
The breathing rate is accelerating; the child starts moving,
wakes up and opens the eyes.
Maturation of Auditory Response
Newborn to 2 months of age
Arousal from sleep. MRL2 in
quiet surroundings 50-70 dB.
MRL in noisy surroundings: 90
d
2
Minimum response level, dB HL. The MRL levels are recorded in sound cabins. In
noisy surroundings the levels will have to be correspondingly higher.
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3-4 months of age
Rudimentary head turn,
horizontally.
MRL: 50-60 dB.
4-7 months of age
Sound localisation to the side
only, not above or below eye
level.
MRL: 40-50 dB.
7-9 months of age
Sound localisation to the side
and
Indirect
MRL: 30-40 dB.
below. (Not above).
9-13 months of age
Sound localisation to the side
and
direct
below.
MRL: 25-35 dB.
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13-16 months of age
Sound localisation to the side,
below and indirect above.
MRL: 25-35 dB.
16-21 months of age
Direct sound localisat ion to
the side, below, indirect
above.
MRL: 25-35 dB.
21-24 months of age
Locates directly sound at any
angle.
MRL: 25-30 dB.
(Above illustrations and explanations are inspired by Northern, J.L.,
Downs, M.P.: Hearing in Children. 2. ed. William A. Wilkins,
Baltimore, 1978).
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Technical Specifications
Standards:
Audiometer: IEC 60645-1, Type 5
Sound Pressure Level of the loudspeaker: ISO 389-7
Sound Pressure Level of the headphone: ISO 389-1
EMC: IEC 60601-1-2
Medical CE-Mark:
The CE-mark indicates that Interacoustics A/S meets the
requirements of Annex II of the Medical Device Direc t i ve
93/42/EEC. TÜV Product Service, Identification No. 0123,
has approved the quality system.
Power:
Batteries: 3 x AA, LR6 or Mignon.
Alkaline or rechargeable (NiMH or NiCa).
Frequencies:
500, 1000, 2000, 3000, 4000 Hz.
Stimuli:
Warble Tone, NB, and WN.
Intensities:
Distance 50 cm: 30 – 80 dB HL in 10 dB steps for Warble
Tone and WN.
20 – 70 dB for NB
Distance 16 cm Increases the indicated intensity by 10 dB.
Warble Frequency:
5 Hz, ± 5%.
Stimulation using TDH39S:
Pure Tone: 500, 1000, 2000, 3000 and 4000 Hz.
Intensities of 30 – 80 dB (independent calibration applied
when TDH39S is connected).
Sound Source:
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Built-in loudspeaker or audiometric headphone TDH39S
(independent calibration registers).
Light Stimulation:
3 LED’s arranged in a triangle, flash speed 5 Hz (5 pulses per
sec).
Tone and Light Stimulation:
Silent presentation switch.
Approximate Battery Lifetime:
The battery lifetime using alkaline battery type:
With the instrument switched off: 12 months
With 80 dB tone switched on: 10 hours
With 80 dB tone and light switched on: 4 hours
Dimensions:
L x W x H: 25 x 7 x 5 cm / 9.8 x 2.7 x 2 inches.
Weight: 0,36 kg incl. batteries.
0,8 lb. incl. batteries.
Warm-up time:
The PA5 is ready for instant use and does not require any
warm-up time.
Environmental conditions:
The specification for the instrument is valid if the instrument is
operated within the follow ing enviro nmental limits:
Temperature: 15°C to 35 °C.
Humidity: 30 %RH to 90 %RH
Transportation and storage of the instrument should be within the
following environmental conditions:
Temperature: Transportation: -20° to 50°
Storage: 0° to 50°
Humidity: 10%RH to 95% RH
Non-condensing. Keep dry.
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Unpacking / Inspection
Check box and contents for da m age:
When the instrument has been received, please check the
shipping box for rough handling and damage. If the box is
damaged, it should be kept, until the contents of the shipment
have been checked mechanically and electrically. If the
instrument is faulty, please contact the nearest service office.
Keep the shipping material for the carrier’s inspection and
insurance claim.
Keep carton for future shipment:
The PA5 comes in its own shipping carton, which is specially
designed for the PA5. Please keep this carton. It will be
needed if the instrument has to be returned for service. If
service is required, please contact your nearest sales and
service office.
Contents of Shipment
Delivered items with PA5:
PA5 delivered as standard contains the following:
- PA5 Paediatric Free Field Audiometer
- 3 AA Batteries
- PA5 Handbag
- Operation Manual
- Service Manual
- Multilingual Instruction for Use
Check numbers on PA5 and Manual:
The identification label on the rear plate holds the serial
number. This should be checked with the manual number, and
written down for later service claims.
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Reporting Imperfections
Report immediately any faults:
The cabinet and the accessories should be checked
visually for scratches and missing parts.
Any missing part or malfunction should be reported
immediately to the supplier of the instrument together with
the invoice, serial number and a detailed report of the
problem. In the back of this manual you will find a "Return
Report", where you can des cr ibe the problem.
Please use "Return Report":
Please realise that if the service engineer does not know
what problem to look for he may not find it, so using the
Return Record will be of great help to us and is your best
guarantee that the correction of the problem will be to your
satisfaction.
Annual calibration head set:
The PA5 has been designed to provide many years of
reliable service, but annual calibration is recommended due
to possible impact on transducers.
We do also recommend to calibrate the PA5, if something
drastic happens to the instrument (e.g. if the instrument
was dropped on the floor).
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Trouble Shooting
PA5 does not turn on:
The batteries have to be replaced.
The batteries might be wrongly inserted into the instrument
(see passage concerning “Batteries” on page 8 of this
manual).
No stimuli from the PA5s internal loudspeaker:
The “dB HL” intensity control is switched off.
No tones in the TDH39 headphone:
The “Tone” presentation signal (10) must be activated by
touching the Tone Switch.
If no sound appears check that the headphone is correctly
connected to the “Headphone Connector” on the stimuli panel
output and that the jack is fully inserted.
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Recommende d Liter a ture
Jerger, James:
Paediatric Audiology, Current Trends
Katz, Jack:
Handbook of Clinical Audiology, Fourth Edition (Williams & Wilkins).
Löwe, Armin:
Pädagogische Hilfen für hör ges chädi gte Ki nd er in Regelsc hul en.
Löwe, Armin:
Kinder-Audiometrie (Carl Marhold Verlagsbuchhandlung).
McCormick, Barry:
Paediatric Audiology 0 – 5 years, Second Edition (Taylor & Francis)
Northern, Jerry L. and Downs, Marion P.:
Hearing in Children (Williams & Wilkins).
PA5 Operation Manual
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Appendix:
General Maintenance Procedures
The performance and safety of the instrument will be kept if the
following recommendations for care and maintenance are observed:
− It is recommended to let the instrument go through at least one
annual overhaul, to ensure that the acoustical, electrical and
mechanical properties are correct. This should be made by an
authorised workshop in order to guaranty proper service and
repair.
− Do not site the instrument next to a heat source of any kind, and
allow sufficient space around the instrument to ensure proper
ventilation.
− To ensure that the reliability of the instrument is kept, it is
recommended that the operator at short intervals, for instance
once a day, perform a test on a person with known data. This
person could be the operator him/herself.
− If the surface of the instrument or parts of it are contaminated, it
can be cleaned using a soft cloth moistened with a mild solution
of water and dish washing cleaner or similar. The use of organic
solvents and aromatic oils must be avoided. Always be careful
that no fluid is entering the inside of the instrument or the
accessories.
− After each examination of a patient, it should be ensured that
there is no contamination on the parts in connection with the
patient. General precautions must be observed in order to avoid
that disease from one patient is conducted to others. If ear
cushions or eartips are contaminated, it is strongly recommended
to remove them from the transducer before they are cleaned. By
frequent cleaning water should be used, but by severe
contamination it may be necessary to use a disinfectant. The use
of organic solvents and aromatic oils must be avoided.
− Great care should be exercised by the handling of earphones and
other transducers, as mechanical shock may cause change of
calibration.
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Return Report
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