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Operation Manual
Screening Audiometer
AS608/AS608e
Valid from serial 744081
80696203 – ver. 06/2009
Operation Manual
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Operation Manual
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Operation Manual
Table of Contents
Table of Contents ............................................................................. 1
Introduction ....................................................................................... 1
Intended Use .................................................................................. 1
Extended Function .......................................................................... 1
Precautions ....................................................................................... 2
Warranty ............................................................................................ 5
Air Conduction .................................................................................. 7
Functions of Buttons & Display .................................................... 10
Power Up and Power Off: ............................................................. 10
Pure Tone Presentation ................................................................ 10
AS608e Special Functions: .......................................................... 11
Display: ......................................................................................... 12
Setup Menu of AS608/AS608e ....................................................... 14
Technical Specifications ................................................................ 19
Parts.............................................................................................. 22
Electrical Installation ..................................................................... 22
External Connections - Standard Accessories ............................. 24
Unpacking / Inspection .................................................................. 25
Contents of Shipment ................................................................... 25
Reporting Imperfections................................................................ 26
Operating Temperature ................................................................ 27
Care and Maintenance ................................................................. 27
Trouble Shooting ............................................................................ 28
Dictionary ........................................................................................ 29
Appendix: General Maintenance Procedures ............................. 30
Drawing of Front Plate ................................................................... 33
Return Report .................................................................................. 35
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Operation Manual
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Operation Manual
Introduction
Intended Use
The AS608/AS608e screening audiometer is designed to be a device
for screening for hearing loss. Output and specificity of this type of
device are based on the test characteristics defined by the user, and
may vary depending on environmental and operating conditions. The
screening for hearing loss using this kind of audiometer depends on
the interaction with the patient. “Normal hearing” result should not
allow for ignoring other contra indications. A full audiologic evaluation
should be administered if concerns about hearing sensitivity persist
The AS608/AS608e audiometer is intended to be used by an
audiologist, hearing healthcare professionals, or trained
technicians in a quiet environment. It is recommended that the
instrument be operated within an ambient temperature range of 1535 degree Celsius (59-95 degrees Fahrenheit)
Extended Function
The AS608e extends the AS608 functionalities with the following
three extra features:
PC Integration through the Diagnostic Suite software. This
enables audiograms to be transferred and displayed in the
Windows software and stored in the OtoAccessTM or Noah
databases. The Diagnostic Suite also includes advanced
reporting and printing features (similar to the AC440 software
module.) Please refer to the Diagnostic Suite user manual
for instructions about how to use the PC software suite.
In addition to traditional manual testing, the AS608e
incorporates a Hughson Westlake patient controlled
automatic threshold test complying with ISO 8253. When the
test is completed the results are easily recalled from the
internal memory of the AS608.
Talk Forward function that makes the AS608e easy to work
with particularly in sound booth installations.
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Precautions
Be sure to use only stimulation intensities,
which will be acceptable for the patient.
The transducers supplied with the
instrument are calibrated to this instrument exchange of transducers require a
recalibration.
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.
Never insert or in any way use the insert
headset without a new clean non defect test
tip.
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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External equipment intended for connection to
signal input, signal output or other connector, shall
comply with relevant IEC standard (e.g. IEC 60950
for IT equipment and the IEC 60601 series for
medical electrical equipment). In addition, all such
combinations – systems – shall comply with the standard 60601-1-1,
Safety requirements for medical electrical systems. Equipment not
complying with IEC 60601 shall be kept outside patient environment,
as defined in standard (at least 1.5 m from the patient).
Any person who connects external equipment to signal input, signal
output or other connectors has formed a system and is therefore
responsible for the system to comply with the requirements of IEC
60601-1-1. If in doubt, contact your service technician or local
representative for help.
If connection is made to a standard PC which is powered through the
mains network, special precautions must be taken in order to
maintain medical safety.
A standard USB cable can only be used, if the connected PC is:
• running on battery, or
• medical approved, or
• powered via a medical approved safety transformer.
In all other cases, a galvanic separator must be inserted in the USB
connection.
The AS608/AS608e is intended to be
powered from a PC as described above,
from batteries or from a medical power
supply type ASA30M-0301. Using other supplies is not allowed.
Do not site the AS608/AS608e next to a
radiator or any other heat source. Allow six
inches between the back panel and the wall
to ensure proper ventilation.
In operation the instrument should not be
subject to temperatures below 15C or
above 35C. If the instrument is moved from
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Operation Manual
a cold location to a warmer one, there will be a risk of condensation.
If condensation occurs the instrument must be allowed to achieve
normal temperature before it is turned on.
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.
To avoid damage to the instrument and
leakage from the batteries, please remove
the batteries if the instrument is unlikely to
be used for some time.
It is important that instructions set forth in
this manual are followed closely in order to
maintain the safety and full functionality of
the instrument.
External power supply through USB socket.
Within the European Union it is illegal to dispose
electric and electronic waste as unsorted municipal
waste. 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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Warranty
INTERACOUSTICS warrants that:
The AS608/AS608e is free from defects in material and
workmanship under normal use and service for a period
of 24 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 any subsequent owner or holder of the product.
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 misuse or negligence or accident, or which has
had the serial or lot number altered, effaced or removed;
or
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improperly maintained or used in any manner other than
in accordance with the instructions furnished by
Interacoustics.
This warranty is in lieu of all other warranties, express or implied,
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
PARTICULAR PURPOSE OR APPLICATION
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Air Conduction
Hearing threshold levels can be determined by presenting test
signals to the test subject with the included earphones (air
conduction – AC). The purpose of AC audiometry is to establish the
hearing sensitivity at various frequencies. The test can specify the
AC loss but cannot distinguish between abnormality in the
conductive mechanism and sensor neural mechanism.
Headset Placement:
Remove eye glasses and ear rings if possible and position
the headband directly over the top of the head. Place the
rubber cushions so that the diaphragms are aimed directly
at the opening into the ear canal. Pull down the yokes of
the phones and adjust for tight fit. If the cushions are not
tight to the ears, the test results may be false at lower
frequencies.
Background Noise:
Background noise can also produce false test results,
especially at lower frequencies. If necessary, the DD45 can
be equipped with noise excluding enclosures. Please
contact the distributor for more information.
Instruction of Subject:
Prior to hearing threshold level measurements, the
following instructions should be given. "You will now hear a
variety of pitches with various loudness levels. Please push
the signal button when you hear a tone and release the
button when you no longer hear it. If not using the response
button, ask the patient to “raise their left or right hand when
you hear the tone in the left or right ear".
Threshold Determination:
The test normally starts at 1000 Hz on the patient's better
ear with the L/R switch adjusted accordingly.
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Familiarization:
Present a tone at 1000 Hz which can easily be perceived
(i.e. 50dB) If necessary, increase with steps of 10 dB until
the tone is clearly perceived.
Threshold Determination:
The hearing threshold is defined as the lowest level at
which more than half of the stimuli are heard. This
threshold is found by the following procedure.
1) Present a tone which is 10 dB lower than the level at
which familiarization was finished.
2) Decrease the level in steps of 10 dB until response
fails.
3) Increase the level in steps of 5 dB until the subject
responds again.
4) Repeat 2) and 3) two or three times until the threshold
appears at the same level.
The time intervals in between the stimuli should be varied
to prevent the subject to react on the rhythm.
5) Change to the next frequency and repeat the
procedure until all frequencies are measured. Repeat
the procedure at 1000 Hz. If the difference to the
previously found threshold is then 5dB or less go to
the other ear. If the difference is 10 dB or higher,
repeat the test at the other frequencies, until
agreement to 5 dB or less has been obtained.
6) Proceed until both ears have been tested.
Screening Procedure:
It is common to test at one dB level for preliminary hearing
screenings as is often done in schools and primary practice clinics.
In this instance you would follow the same familiarization and
instruction procedures as stated above, but present a single dB level
(i.e. 25dB) at just 4 frequencies (500, 1000, 2000 & 4000 Hz) in each
ear. In this instance, you simply record a response or no response to
the single tone presentations at each frequency.
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Auto Threshold:
In addition to traditional manual testing, the AS608e incorporates a
Hughson Westlake patient controlled automatic threshold test
complying with ISO 8253. When the test is completed the results are
easily recalled from the internal memory of the AS608e and
transferred to the Diagnostic Suite PC software and stored in
OtoAccessTM or Noah.
Hughson Westlake is an automatic pure tone test procedure.
Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses
at a certain level in a 5 dB increase and 10 dB decrease test
procedure. The Hughson Westlake is used to obtain pure tone
thresholds automatically.
Talk Forward
The Talk Forward function makes the AS608e easy to work with
particularly in sound booth installations.
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Functions of Buttons & Display
The AS608/AS608e front plate:
Power Up and Power Off:
To turn on the audiometer press the Tone Switch (3) button. To
power off the audiometer hold down the two rotary wheel buttons, 1)
and 2), simultaneously for a few seconds. The audiometer will also
automatically power off after 1, 2, 3, 4 or 5 minutes depending on the
settings (see next section).
Pure Tone Presentation
1) Select desired frequency with the "Frequency" button
2) Select desired intensity with the HL dB.
3) Present tone by touching Tone Switch. An indication will be on
Display (see below).
1 2 3
A B C
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F1) On AS608: Select the Right ear. On AS608e: Toggle between
Right and Left.
F2) On AS608: Select the Left ear. On As608e: Store threshold.
F3) Manual or Pulse:
Manual: Manual Tone presentation as long as the Tone Switch
is activated.
Pulse: Pulsing Tone will be presented as long as the Tone
Switch is activated.
F4) Pure Tone or Warble:
If Tone is selected pure tones will be presented to the subject when
the Tone Switch is activated.
If Warble is selected warble tones will be presented to the
subject when the Tone Switch is activated.
AS608e Special Functions:
Talk Forward: On the AS608e Talk Forward is activated by holding
down the HL db (3) rotary wheel.
While holding down the The Talk button (3), the talk forward level
can be adjusted.
The following F-key functionalities can be access by pressing the
frequency rotary wheel (1):
F1: Delete all thresholds stored in the internal memory of the
AS608e.
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F2: Store a Not Heard threshold point.
F3: Display the L/R thresholds stored in the internal memory of the
AS608e.
F4: Start the Hughson Westlake (HW) automatic test procedure.
Please refer to the next chapter for instructions about how to setup
the HW test.
Display:
A) Tone: A tone presentation indicator is provided in the top left
corner of the display header.
B) Response: When using the APS3 response button, a
response is indicated in the middle of display header.
C) Power On or Battery status: The power status of the
AS608/AS608e is indicated in the top right corner of the display
header.
The icon will change depending on whether the instrument is
powered via an external source (power supply or USB
connection to computer) or batteries.
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When powered by batteries, the battery icon will change
depending on the battery power level. When batteries are
running low the display will read Low Battery and flash.
The Power Off settings of the instrument can be adjusted at
different time intervals or set to never power off – please see
Setup section for details.
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Setup Menu of AS608/AS608e
To access the AS608/AS608e setup menu press F1 and F4
simultaneously for 2-3 seconds.
F1
Change setting
F2
Browse up in the setup menu
F3
Browse down in the setup menu
F4
Save settings and Back to previous screen display –
see below for details
Power up Tone
Press Change to toggle between Manual and Reverse.
Power up Ear
Press Change to toggle between Right and Left ear as the default
ear for Power Up
Default Intensity
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The default intensity when changing ear side. Choose between: Off,
-10dB, -5dB, 0dB, 5dB, 10dB, 15dB, 20dB, 25dB, 30dB, 35dB, 40dB,
45dB and 50dB.
Intensity Steps
Choose Between: 1 dB and 5 dB.
Power Off setting
Press Change to toggle between Never, 1, 2, 3, 4 or 5 minutes.
Pulse Length
Press Change to toggle between 250msec and 500msec.
Language
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Press Change to toggle between English, German, Spanish and
French.
LCD Contrast.
Press Change to toggle between settings ranging from 0 (very bright)
to 6 (very dark).
HW Test... (only on AS608e)
Press Change to go to the Hughson Westlake (HW) automatic test
procedure setup.
Press Change to toggle between Familiarization On/Off.
Familiarization is used to train the patient
Press Change to toggle between “2 correct out of 3 answers” and “3
correct out of 5 answers”. The conditions used before going to the
next frequency.
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Select the frequencies to include in the HW test. Press Change to
toggle between frequencies On/Off.
Press Save to return to the main HW setup menu.
Frequencies
Press Change to access the default frequency range from 125Hz to
8 kHz for daily operation.
7 frequencies are available to change: 125, 250, 750, 1,500, 3,000,
6,000 and 8,000.
Press Change to toggle between On or Off.
Press Save to return to the main setup menu.
License.
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Press Change to access the license key of the AS608/AS608e
instrument.
Press Change to enter and/or modify the license key of the
AS608/AS608e instrument.
Use button 2 to change the letter and button 1 to move the
cursor
Press Save to return to the main setup menu.
About
Press Change to access the information in the About section.
Press Back to return to the main setup menu.
Press Save to return to measurement screen of the AS608/AS608e.
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Technical Specifications
Standards:
Meets or exceeds EN 60645-1 type 4 and ANSI S3.6
Safety Standard: EN 60601-1, Class II, type B.
EMC: EN 60601-1-2
Calibration:
ISO 389-1 (DD45)
ISO 389-2 (EAR-Tone 3A and 5A)
PTB Report 1.61-64/04 (HDA280).
PTB Report 1.61-4039503/09 (DD45)
Medical CE-mark:
The CE-mark indicates that Interacoustics A/S meets the
requirements of Annex II of the Medical Device Directive
93/42/EEC. TÜV Product Service, Identification No. 0123,
has approved the quality system.
Frequencies and Intensities:
Freq. Hz.
AC, dB HL
125
70
250
90
500
100
750
100
1000
100
1500
100
2000
100
3000
100
4000
100
6000
100
8000
90
Inputs: Tone
Warble Tone ±5%, 5Hz (true sine wave frequency
modulation).
Outputs: Left and Right.
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Tone Presentation:
Manual or Reverse (chosen in Setup Menu).
Multiple pulses 250 or 500msec (chosen in Setup Menu.).
Talk Forward:
Built in talk forward microphone. 0-110dB
SPL. Continuously adjustable on operation
panel.
Auto Threshold:
Patient controlled Hughson Westlake
procedure according to ISO 8253-1.
Store Function:
Soft key (F-key) store button and internal
memory for AC L/R. Stored Measurements
can be viewed on the build in display or
transferred to the PC using the Diagnostic
Suite Audiogram software module.
PC Software / Interface: The Diagnostic Suite PC software with
advanced reporting and printing features. OtoAccessTM and
Noah compatible.
Distortion:
0,3% typical at full intensity.
1% maximum at full intensity.
Rise/fall Times:
35 msec. typically.
Display Header Indicators:
Tone On.
Patient Response.
Power/Battery Status
Batteries:
3 AA size.
Automatic battery on/off switching.
Automatic battery status indication.
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Battery life:
Standby: 6 months
Tone presentations: 70.000
External Power Supply (though USB connector):
Accepts 5 VDC – minimum 150 mA.
The recommended ASA30M-0301 (100-240 VAC, 0.8 – 0.4
Amp) is approved with the AS608/AS608e.
Construction:
Plastic cabinet.
Dimensions:
WxDxH: 22.5 x 18 x 5.5 cm / 8,9 x 7.1 x 2,2 inches
Weight: 1.0 kg – including batteries and headset.
1.6 kg – including TC608 carrying bag incl. peltor noise
reducing headset, audiogram charts etc.
Operating Environment:
Temperature: 15-35C/59-95F.
Relative Humidity: 30-90 %.
Storage Environment:
Temperature: 0-50C/32-122F.
Relative Humidity: 10-95 %.
Transport Environment:
Temperature: -20-50C/-4-122F.
Relative Humidity: 10-95 %.
Computer requirements:
Must comply with IEC 60950-1.
Equipped with a USB connection.
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Parts
Included Parts:
DD45 Audiometric Headset
200 AF12 Audiogram Charts
TC608 Carrying Bag
Pen set, 3 pens
Operation Manual
Multilingual CE operation instructions
CD Diagnostic Suite (only AS608e)
Additional Parts:
ASA30M-0301 External Power Supply Medical CE
Approved
APS3 Patient Signal Button
21925 Audiocup Noise Excluders
50250 Peltor Noise Excluders
Electrical Installation
Socket for external
power supply.
Batteries:
6 types AA /LR6 three
in each battery holder
Socket for
patient response
(APS3)
Socket for
external power
supply
Sockets for transducers
(left = blue and right =
red)
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Compartment for three
AA-size batteries
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External Connections - Standard Accessories
Patient
Response
Switch APS3
Standard
Headphones
DD45
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Unpacking / Inspection
Check box and contents for damage:
When the instrument is 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 AS608/AS608e comes in its own shipping carton,
which is specially designed for the AS608/AS608e. 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 AS608/AS608e:
AS608/AS608e is as a standard unit delivered with the
following:
Quantity Item Order No.
1 Instrument AS608/AS608e
1 Audiometric Headset DD45
200 Audiogram Forms AF12
1 Pen Set, 3 pens
1 Carrying bag TC608
1 Operation manual
1 Multilingual CE operation instructions
1 CD Diagnostic Suite (only AS608e)
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Check numbers on AS608/AS608e 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.
To observe the CE-mark of AS608/AS608e with an
external power supply, the power supply must be CEmedical approved.
When AS608/AS608e is supplied with the external power
supply model EPS11 write down the serial number located
on its bottom plate.
Reporting Imperfections
Inspect before connection:
Prior to connecting the AS608/AS608e to the mains it
should once more be inspected for damage. All of the
cabinet and the accessories should be checked visually for
scratches and missing parts.
Report immediately any faults:
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
problem. In the back of this manual you will find a "Return
Report" where you can describe the problem.
Please use "Return Report":
Please realise that if the service technician does not know
what problem to look for he may not find it, so using the
Return Report will be of great help to us and is your best
guarantee that the correction of the problem will be to your
satisfaction.
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Operating Temperature
Keep away from heat:
Do not site the AS608/AS608e next to a radiator or any
other heat source. Allow six inches between the back panel
and the wall to ensure proper ventilation.
Operating temperature: 15C- 35C/ 59-95F:
In operation the instrument should not be subject to
temperatures below 15C or above 35C/ below 59F or
above 95F.
If it has been exposed to abnormal low temperatures the
warm-up time must be respectively prolonged.
Care and Maintenance
The performance and reliability of the AS608/AS608e will be
prolonged if the following recommendations for care and
maintenance are adhered to:
Using an external power Supply e.g. ASA30M-0301 - Turn the
switch to the off position.
Great care when handling the headset:
Great care should be exercised when handling the headset as
dropping it may alter the calibration.
Annual calibration headset:
The AS608/AS608e has been designed to provide many
years of reliable service, but annual calibration is
recommended.
We do also recommend to calibrate the AS608/AS608e if
something drastic happens to part of it (e.g. headset is
dropped).
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Trouble Shooting
AS608/AS608e does not turn on:
Using External Power Supply:
The power cable must be correctly connected to the mains.
The mains switch must be "on", and the power switch on
the external power supply must also be "on".
If still nothing happens a fuse in the external power supply
may be blown. Replace fuses with exactly the same type.
Using Batteries:
The batteries might need to be changed - an indication on
the top right corner of the display will be provided and the
operator prompted on the status via a flashing screen.
External Power Cable connected to AS608/AS608e will
disconnect batteries - unplug cable for battery operation.
No tones in the DD45 headphone:
Left (F1) or Right (F2) ear must be selected.
The Attenuator (2) must be turned up.
The “Tone” presentation signal (A) must be activated by
touching the Tone Switch.
If still no sound appears check that the headphone is
correctly connected to the “phone” outputs.
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Dictionary
Position:
Symbol:
Explanation (English):
F1
AS608: Right
AS608e:
Right/Left
AS608: Selects Right headphone.
AS608e: Toggles between right
and left headphone.
F2
AS608: Left
AS608e: Store
AS608: Selects Left headphone.
AS608e: Stored the selected
threshold in the internal memory
F3
Man / Pulse
Select Man to have the tone
presented when Tone Switch is
activated. Select Pulse to present
pulsing tones when the Tone
Switch is activated.
F4
Pure Tone /
Warble
Select Pure tone or Warble tone as
stimulus.
1 Frequency
Selects stimulus frequency.
2
HL dB
Adjustment of Intensity
3
Tone Switch
Presents stimulus.
A (Display)
Tone
Indicates presentation.
B (Display)
Response
Indicates response from patient.
C (Display)
Power On /
Battery Low
Indication of Power/Battery status.
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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.
Before the connection to the mains network, be sure that the local
mains voltage corresponds to the voltage labelled on the
instrument. Always disconnect the power cord if the instrument is
opened or by control / replacement of the mains fuses.
Observe that no damage is present on the insulation of the mains
cable or the connectors and that it is not exposed to any kind of
mechanical load, which could involve damage.
For maximum electrical safety, turn off the power from a mains
powered instrument when it is left unused.
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.
A plastic cover can be provided to protect the instrument against
the accumulation of dust. The cover should only be used when
the instrument is left unused with the power turned off.
If the surface of the instrument or parts of it is 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 disconnect
the mains conductor during the cleaning process, and be careful
that no fluid is entering the inside of the instrument or the
accessories.
AS608/AS608e Operation Manual Page31
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.
AS608/AS608e Operation Manual Page32
AS608/AS608e Operation Manual Page33
Drawing of Front Plate
1 2 3
A B C
AS608/AS608e Operation Manual Page34
AS608/AS608e Operation Manual Page35
Return Report
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