AmpliVox 260 User manual

Amplivox Model 260
Diagnostic Audiometer
Operating Manual
(Applies from serial number 12790 onwards)
Amplivox Ltd
29-30 Station Approach
Kidlington
Oxford OX5 1JD
ENGLAND
Tel: [phone]
Fax: [phone]
[e-mail]
www.amplivox.ltd.uk

Contents
1 Introduction 3
1.1 Intended applications 3
1.2 Unpacking 3
1.3 Warranty card (UK customers only) 3
1.4 Standard contents 3
1.5 Optional accessories 4
2 Important Safety Instructions 4
2.1 Precautions 4
2.3 Mains supply operation 5
2.4 Audiometer connections 6
2.5 Data transfer to a printer 6
2.6 Data transfer to a computer 7
2.7 Line in/out connection (audio) 7
3 Using the Audiometer 7
3.1 Switching the audiometer on and off 7
3.2 Testing the patient response switch 8
3.3 Audiometer display 8
3.4 Audiometer controls 8
3.5 Threshold Retention Function 13
3.6 Saving audiograms in internal memory 13
3.7 Loading audiograms from internal memory 14
3.8 Printing audiograms 14
3.9 Data transfer to a NOAH database 14
4 Suggested Sequence of Operation and Test Procedure 15
5 Specification 17
5.1 Output data 17
5.2 Maximum hearing levels provided at each frequency 18
5.3 Physical Data 18
5.4 Equipment classification 18
6 Symbols 19
7 Technical Information 20
8 Routine Maintenance 21
8.1 Audiometer maintenance 21
8.2 Transducer maintenance 21
8.3 Mains adapter maintenance 23
9 Instrument Storage and Transportation 23
10 Calibration and Repair of the Instrument 23
11 Guarantee 24
12 Ordering Consumables and Accessories 25
Appendix 1 - Speech Audiometry 27
Appendix 2 - Free Field Calibration Procedure 33
Appendix 3 - EMC Guidance & Manufacturer’s Declaration 39
Appendix 4 - Use with Non-medical Electrical Equipment 45

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OM023-4 Amplivox 260 Operating Manual Page 3
1 Introduction
Thank you for purchasing an Amplivox audiometer. The Amplivox Model
260 is a diagnostic audiometer that will give many years of reliable service
if treated with care.
1.1 Intended applications
The Amplivox Model 260 diagnostic audiometer is designed for use by
audiologists, general practitioners, hearing aid dispensers and child health
professionals. Capable of undertaking both air and bone conduction tests
with or without masking, the audiometer has many additional features
such as the facility to support speech audiometry from live or recorded
sources, the option to select free-field equivalent output from the
headphones in speech mode and clinical audiometry tests.
1.2 Unpacking
Open the shipping carton and carefully remove all the equipment. Check
against the delivery note that all the accessories ordered have been
included with your audiometer. If anything is missing, please contact
Amplivox Customer Support ([phone]; [e-mail]). If
you have purchased from a distributor you should contact them directly.
Please retain the shipping carton and packing materials as the audiometer
will need calibrating on an annual basis and should be returned to
Amplivox in its original shipping carton.
1.3 Warranty card (UK customers only)
Please complete the enclosed warranty registration card and return it to
Amplivox Ltd to register your purchase. This will help us to deal with your
enquires, and we will also be able to send you details of updates to your
product and of new products and services.
1.4 Standard contents
Amplivox Model 260 Audiometer Audiometric headset
Bone conductor headset Patient response switch
Mains adaptor, see 2.3 Audiogram cards
Operating manual Calibration certificate
Carrying case

Page 4 OM023-4 Amplivox 260 Operating Manual
1.5 Optional accessories
Masking earpiece Additional audiogram cards
Microphone and monitor headset Insert earphones
Printers NOAH Audilink Interface
Printer cables Data cable for NOAH
Audiocups (noise reducing earphone enclosures)
2 Important Safety Instructions
The Amplivox Model 260 instrument must be used only by
practitioners qualified to perform audiometric tests. It is
intended for use as a screening and diagnostic tool.
2.1 Precautions
READ THIS OPERATING MANUAL BEFORE ATTEMPTING TO USE
THE INSTRUMENT
To comply with the standards IEC 60601-1 for safety and IEC 60601-1-2
for EMC the audiometer is designed to be used only with the medically-
approved mains adapter supplied, which is specified as part of the
equipment. Do not use any other type of mains adapter with this
instrument. Refer to Section 12 for the stock number of the adapter.
The audiometer is for indoor use only and should be used only as
described in this manual.
The transducers supplied with the audiometer are specifically calibrated
with it; if these transducers are changed calibration will be required.
Do not immerse the unit in any fluids. See section 8 of this manual for the
proper cleaning procedure for the instrument and its accessories and the
function of single-use parts.
Do not use the instrument in an oxygen-rich environment or in the
presence of a flammable anaesthetic mixture or other flammable agents.
Do not drop or otherwise impact this instrument. If the instrument is
dropped or damaged, return it to the manufacturer for repair and/or
calibration. Do not use the instrument if any damage is suspected.

OM023-4 Amplivox 260 Operating Manual Page 5
The instrument must be stored and used within the specified temperature,
pressure and humidity ranges (see Sections 7 and 9).
Do not attempt to open, modify or service the instrument. Return the
instrument to the manufacturer or distributor for all repair and servicing
requirements. Opening the instrument will void the warranty.
2.2 Electromagnetic compatibility (EMC) considerations
Medical electrical equipment needs special precautions regarding EMC
and needs to be installed and put into service according to the EMC
information in Appendix 3. This provides guidance on the electromagnetic
environment in which to operate the instrument.
Portable and mobile radio-frequency (RF) communications equipment can
affect medical electrical equipment. The instrument should not be used
adjacent to or stacked with other equipment; if this is necessary the
instrument should be observed to verify normal operation.
2.3 Mains supply operation
The audiometer is designed for continuous operation and is powered by a
mains adapter which is supplied, and specified as part of the equipment. If
a replacement is required, please contact your Amplivox distributor.
All other connections must be made before connecting the output lead
from the adapter into the POWER input socket on the back of the
audiometer. Switch on the mains supply - the indicator on the adapter and
the POWER indicator on the audiometer will both illuminate green,
showing that the instrument is ready for use.
The output from mains adapter is fitted with electronic circuit protection. In
case of overload the adapter will shut down and the indicator will be
extinguished. When the fault is cleared the adapter will operate as normal.
The input to the mains adapter is protected with a non-replaceable fuse. If
this fails the adapter will not operate.
The mains adapter is the mains disconnect device and therefore the
audiometer should be positioned such that easy access to the mains
adapter is possible.

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2.4 Audiometer connections
All the relevant accessory terminals and connections are labelled to
ensure correct identification and connection as follows:-
Socket Label
Socket Type
Colour
Code
Connected Part
Notes
MIC 1
3.5mm jack
Speech Input Microphone *
MONITOR
3.5mm jack
Monitor Earphone *
BONE
6.3mm jack
Grey
Bone Vibrator Headset *
INSERT
3.5mm jack
Masking Earphone *
RIGHT
LEFT
6.3mm jack
6.3mm jack
Red
Blue
Air conduction headset *
MIC 2
3.5mm jack
Talkback Microphone *
POWER
2.5mm power jack
Mains AC/DC Adapter *
RESPONSE
6.3mm jack
Black
Patient Response Switch *
LINE IN
LINE OUT
3.5mm jack
3.5mm jack
CD/tape player
External amplifier
See
2.7
DATA
6 pin mini DIN
Printer *
See
2.5
USB
USB Connector
Type B
Computer (via USB port)
See
2.6
The relevant part numbers are indicated in Section 12.
For connected parts marked * only connect the
accessories supplied with the instrument or supplied by
Amplivox or an Amplivox distributor. These parts have
been tested for use with the Amplivox Model 260
Diagnostic Audiometer for compliance with the standards
IEC 60601-1 and IEC 60601-1-2. The use of accessories
other than those specified may compromise compliance
with these standards. For other sockets see Appendix 4.
2.5 Data transfer to a printer
Please refer to Appendix 4 for important information
regarding the connection of non-medical electrical
equipment to medical electrical equipment
The audiometer can be upgraded with an option to allow connection to
one of two designated portable thermal printers for printing air conduction,
bone conduction and ULL test results (see Section 3.8). You must use the
designated cable for each printer, which is supplied with this option.

OM023-4 Amplivox 260 Operating Manual Page 7
Upon receipt of the printer it must be initially charged for a minimum of 15
hours prior to use.
2.6 Data transfer to a computer
Please refer to Appendix 4 for important information
regarding the connection of non-medical electrical
equipment to medical electrical equipment
The audiometer can be upgraded with an option to allow connection to a
computer with the NOAH application for the transfer of air conduction,
bone conduction, speech and ULL test results (see Section 3.9). You must
use the designated cable which is supplied with this option.
2.7 Line in/out connection (audio)
Please refer to Appendix 4 for important information
regarding the connection of non-medical electrical
equipment to medical electrical equipment
The Amplivox Model 260 has audio line in/out connections for CD or tape
player input (e.g. for recorded speech testing) and amplifier output.
Important Note:
Line out connections are switched on only when FREFIELD is selected.
The following connections apply to both LINE IN and LINE OUT.
Main Body Segment
Mid segment
End segment
Ground
Right Channel
Left Channel
For more information on live and recorded speech refer to Appendix 1.
3 Using the Audiometer
3.1 Switching the audiometer on and off
Press the ON/OFF key located at the left of the front panel. No warm-up
time is required. The display will briefly show the model and the type of
headphone currently in use.

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If a secondary headphone has been enabled (e.g. E-5A) it will then be
necessary to select the required headphone as follows:
Either - press YES to confirm the current headphone selection
Or - press NO to toggle to the other option and then YES to confirm
the selection
Note: headphone selection must be confirmed before any other
operation can be performed.
The display will then be as shown in Section 3.3.
To switch off, press and hold the ON/OFF key. While holding the key
press YES to confirm. To cancel the switch-off release the ON/OFF key.
3.2 Testing the patient response switch
Press the patient response switch and the light labeled RESPONSE
(above and to the right of the display) will illuminate green.
3.3 Audiometer display
On start-up the display will show the following default setting:-
SIGNAL FREQUENCY Hz MASKING
30dBHL 1kHz OFF
< > < > THL
This indicates that when the PRESENT key is pressed, a tone will be
presented at 30dBHL at a frequency of 1kHz (1000Hz) to the designated
ear. On start up the audiometer defaults to the left ear.
3.4 Audiometer controls
3.4.1 Multifunction Keys
Several keys on the audiometer have different functions depending on the
actual mode of operation. These are ON/OFF (MENU), LEFT (NO),
RIGHT (YES) and FREQUENCY (MENU SELECT). The use of these
keys is described below.

OM023-4 Amplivox 260 Operating Manual Page 9
3.4.2 MENU
Pressing and holding MENU accesses the following options. Use the
MENU SELECT keys to step through the available options and then the
NO, YES or SIGNAL  keys to select an action or modify a setting.
Release of the MENU key then initiates the action or saves the modified
setting and returns to the default display.
Menu Option Description
Switch off?: As described in Section 3.1
Print audiogram?: Press YES and release MENU; then press YES
to confirm the print operation or NO to cancel
Clear test?: Press YES and release MENU to clear the
displayed test results; stored test results are
not affected
Save audiogram to 1: Use the SIGNAL  keys to select the
required storage location and press the YES
key to save the audiogram; then release MENU
Load audiogram no. 1: Use the SIGNAL  keys to select the
required storage location and press the YES
key to load the audiogram; then release MENU
Contrast: Adjust contrast using the SIGNAL  keys
Bone masking: Use the SIGNAL  keys to select the AC
headset or the optional masking earpiece as
the means of masking
Select phones: This option is only available if a secondary
headphone is enabled; use the SIGNAL 
keys to select the required headphone type
FF equiv. speech?: This option is only available if either DD45 or
TDH39 is the selected headphone; if activated,
free-field equivalent levels will output to the
headphone in speech mode (see Appendix 1)

Page 10 OM023-4 Amplivox 260 Operating Manual
Store on 2 of 3?: Use the NO and YES keys to activate
automatic storage of a threshold if the
responses made to two out of three test signals
are at the same hearing level
Warble to phones?: Use the NO and YES keys to send frequency-
modulated tones to the headphones
Set freefield level?: This option provides access to the freefield
calibration function; refer to Appendix 2 for
details
Default level: Adjust the default tone presentation level
(between 20dBHL and 40dBHL) using the
SIGNAL  keys
2.5dB step size?: Use the NO and YES keys to disable or enable
the 2.5dB step size; otherwise step size is 5dB
External talkover?: Select NO to use the internal microphone and
YES to use the MIC 1 input
Select printer: Use the SIGNAL  keys to select either the
Able AP1300 or the Martel MCP8830 printer
Air Conduction ULL: Use the NO and YES keys to disable or enable
the uncomfortable loudness level (ULL)
function; if enabled, the thresholds recorded will
be stored, printed & transferred as ULL results
3.4.3 Description of Function of Other Keys
PULSE This enables the pulse tone present function when the
PRESENT key is operated; the indicator above the key
illuminates green
MASK This switches on masking at 30dBHL; narrow band noise
for pure tones, and speech-weighted noise for speech;
the indicator above the key illuminates green
CONSTANT This switches tone or speech signal on continuously; the
indicator above the key illuminates green; it may be
interrupted by pressing the PRESENT key

OM023-4 Amplivox 260 Operating Manual Page 11
+20dB This enables tone levels to be presented with up to 20dB
higher output; press the key and then use SIGNAL to
access the extra 20dB; an indicator above the key
illuminates green to show that the function is active, and
an additional display message indicates levels greater
than 100dBHL. Note: this function will not operate if
continuous tone presentation has been enabled.
FREE This disconnects the headphones and bone vibrator,
FIELD routes signals to LINE output socket and outputs warble
tones instead of pure tones; note that no masking is
available in Free Field with warble tones; the indicator
above the key illuminates green
SPEECH Use this key to cycle through the selection of LINE input
(for recorded speech), MIC input (for live speech from
MIC 1), or speech facility off; the indicator above the key
illuminates green
BONE Outputs the signal to the bone vibrator; the indicator
above the key illuminates green
TALKOVER Hold this key to interrupt the test and route the operator’s
voice from the front panel microphone (or MIC 1 input) to
the headset; the level is adjusted with the SIGNAL 
keys
TALKBACK Press this key to route the signal from MIC 2 to the
MONITOR output; the indicator above the key illuminates
green press again to de-activate; hold the button down to
adjust the talkback level using the SIGNAL  keys
LEFT Press once to select the left ear; the indicator above the
key illuminates green; if the left ear is already selected
press again to store the displayed signal value as a
threshold (or a ULL if this has been selected)
RIGHT Press once to select the right ear; the indicator above the
key illuminates green ; if the right ear is already selected
press again to store the displayed signal value as a
threshold (or a ULL if this has been selected)

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SIGNAL Press the  keys to decrease or increase the level of
the tone presented in 2.5dB or 5dB steps (see Section
3.4.2); to scroll through the range keep the key pressed
FREQUENCY Press the key to select a lower frequency and the 
key to select a higher frequency
MASKING With the MASK function on, press the MASKING 
keys to decrease or increase the masking level in 2.5dB
or 5dB steps (see Section 3.4.2); to scroll through the
range keep the key pressed
These keys are also used to set the LINE & MIC levels in
SPEECH mode
PRESENT Press to present the displayed test signal to the patient.
The “PRESENT” indicator above the display will illuminate
green during presentation
3.4.4 TEST MENU
Pressing TEST MENU selects the following test options in order. For
Stenger and ABLB the indicator above the key illuminates green.
Test Description
STENGER: Routes tone or speech to both earphones
simultaneously. Use the SIGNAL  keys to
adjust the left channel level and the MASKING
 keys to adjust the right Refer to Appendix
1 for details of the Stenger test in speech
mode.
ABLB: Alternate Binaural Loudness Balance: Routes
tone to each earphone alternately. Use the
SIGNAL  keys to adjust the left channel
level and the MASKING  keys to adjust the
right. Pressing the PRESENT key interrupts the
signal presented.
THL/ULL: Manual audiometry

OM023-4 Amplivox 260 Operating Manual Page 13
To exit from the Stenger or ABLB test modes press TEST MENU until THL
is displayed (or ULL if this has been selected) and the green indicator
above the key goes out.
3.5 Threshold Retention Function
This function stores the last presented combination of ear, tone and
frequency for every frequency tested in the audiometer’s memory (air
conduction and bone conduction). Once a threshold has been determined
press the “selected” ear key once again and the level will be stored and
displayed in a similar way to that shown in the illustration below.
The operator can then review the results at the end of the test and record
them on an audiogram card, print them with the optional printer (see
Section 2.5), store them in the internal memory (see Section 3.6) or
transfer the results to a NOAH database on a computer (see Section 2.6).
To review the retained thresholds, select the frequency using the
FREQUENCYkeys. The values for the left and right ears are shown
on the lower line of the display as shown below.
SIGNAL FREQUENCY Hz MASKING
30dBHL 4kHz OFF
[ 20L] [ 10R] THL
This display shows
thresholds at 4kHz
Thresholds retained
Left ear 20dBHL
Right ear 10dBHL
To set and review bone conduction thresholds use the BONE key. To
store and review ULL, switch to this mode (see Section 3.4.2)
To clear the Threshold Retention memory, use the Clear test menu option
described in Section 3.4.2.
3.6 Saving audiograms in internal memory
The user may store up to 12 audiograms, referenced by number, in the
internal memory of the audiometer. To save the current set of audiogram
thresholds (the “retained” values described in Section 3.5) press and hold
the MENU key, press FREQUENCY repeatedly until “Save Audiogram
to 1” appears on screen. Use the SIGNAL keys  to select a location
numbered 1-12, and then press the YES key. Release the MENU key
once confirmation appears on the display.

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Note that the Save process will overwrite any records that exist in the
selected memory location.
3.7 Loading audiograms from internal memory
Press and hold the MENU key, press FREQUENCY repeatedly until
“Load Audiogram no. 1” appears on screen. Use the SIGNAL keys  to
select a location numbered 1-12, and then press the YES key. Release
the MENU key once confirmation appears on the display.
3.8 Printing audiograms
Two designated thermal printers (the Able AP1300 or the Martel
MCP8830) are available as options for use with the Amplivox Model 260
audiometer. The correct printer must be selected (use the MENU options
described in Section 3.4.2 to make this selection).
Connect the audiometer to the printer with supplied printer cable (refer
to Section 2.5 of this operating manual for printer set-up). Insert the 6-
pin mini DIN into the DATA socket on the back of the audiometer.
Insert the terminal plug into the socket at the back of the printer. Note
that the printer cables for the Able printer (stock number A105)
and Martel printer (stock number A104) are not compatible.
Ensure the printer is fully charged, switched on, loaded with paper and
ready to print.
Load the desired audiogram as described in Section 3.7; to print the
current audiogram ignore this instruction.
Press and hold the MENU key and press the FREQUENCY key to
display “Print Audiogram”. Continue to hold the MENU key, press the
YES key and release the MENU key. On the prompt “Is printer
ready?” press the YES key again. The audiogram will then print. To
cancel the print operation press NO.
Hearing levels will be printed if available for both ears at every
frequency for air conduction (ACT), uncomfortable loudness (AUL),
bone conduction unmasked (BC) or bone conduction masked (BM)
3.9 Data transfer to a NOAH database
For transfer of test results stored within the audiometer to a NOAH
database the Amplivox link driver disc (see Section 12) is required. This
option includes a USB cable to connect to a PC and the necessary
installation & operating instructions.

OM023-4 Amplivox 260 Operating Manual Page 15
4 Suggested Sequence of Operation and Test Procedure
The following applies to air conduction measurements. For illustrative
purposes 5dB steps are used. Refer also to ISO 8253 for guidance.
4.1 Audiometry preparation and ambient conditions
Refer to the various audiometric standards and other relevant publications
for guidance on audiometric testing.
Audiometric testing should always be performed in quiet conditions (e.g. a
quiet room or an acoustic booth). The optional Audiocups can provide an
additional level of isolation from ambient noise. For further explanation on
permissible ambient noise levels, please refer to the audiometry standard
ISO6189.
4.2 Test system arrangement
The schematic diagram below shows a typical example of the use of
audiometric test equipment. The audiometer is located on the desk of a
seated operator as shown.
The patient is seated in front of the desk facing away from the operator.
The patient wears a headset or appropriate transducer (see Section 4.3)
and responds to test stimuli by use of a hand-held switch which is also
connected to the instrument.
4.3 Headset
The headset or appropriate transducer must be fitted by a qualified person
to ensure a proper seal and a comfortable fit. The leads from the headset
are connected to the instrument and the headset is then fitted to the
patient.
Operator
Audiometer
Computer (optional)
Patient, wearing headset
Headset lead
Response switch & lead

Page 16 OM023-4 Amplivox 260 Operating Manual
4.4 Patient instructions
The patient should be given the following instructions using the
TALKOVER function:
“As soon as you hear the tone, press the response switch. When you
no longer hear the tone release the response switch”
4.5 Pre-test
(1) Switch the audiometer on
(2) Perform a listening check
(3) Decide whether to use the Threshold Retention Function, the Store on
2 of 3 option, or an audiogram card to record the thresholds
(4) Prepare the test environment & patient (see Sections 4.1 to 4.4)
(5) Select the better hearing ear (according to the patient) by pressing
either the LEFT or RIGHT key
4.6 Test
(6) Present the first test tone at 30dB at 1kHz
(7) If the patient responds, reduce the signal level in 10dB steps until they
no longer respond; then increase the signal level in 5dB steps until the
patient responds
(8) If the patient fails to hear the first tone, increase the signal level in 5dB
steps until they do respond and then continue with step 10
(9) Repeat the test by reducing the signal level in 10dB steps until the
patient no longer responds; then increase the signal level in 5dB steps
until they do respond and note this level
(10)If Store on 2 of 3 is selected, go to step 13
(11)Repeat step 10 until the patient responds three out of a maximum of
five times at the same signal level, indicating the patient’s hearing
threshold level for that frequency; mark the threshold on an audiogram
card or press the “selected” ear key once to activate the Threshold
Retention Function which then displays the threshold on screen
(12)If Store on 2 of 3 is selected, repeat step 10 until the patient has
responded 2 out of a maximum of 3 times at the same signal level;
this will automatically display the threshold on the screen
(13)Proceed to the next test frequency and repeat steps 7 to 13
(14)Repeat steps 7 to 14 for the other ear

OM023-4 Amplivox 260 Operating Manual Page 17
4.7 Post-test
(15)Use the Threshold Retention Function to review the results (See 3.5)
(16)If required do one or more of the following:
Record the results on an audiogram card, or
Save the results to the internal memory (Section 3.6), or
Print the results (Section 3.8), or
Transfer the results to a computer (Section 3.9)
To clear the Threshold Retention memory, use the Clear test menu option
described in Section 3.4.2.
5 Specification
5.1 Output data
Outputs: Left earphone, Right earphone, Bone (L&R)
Insert masking and Freefield
Frequency range (Hz): Air: 125-8KHz
Bone: 250Hz-8KHz
Frequency accuracy: <1%
Distortion: <2%
Output level range (AC): -10dBHL to 120dBHL maximum
Output level range (BC): -10dBHL to 70dBHL maximum
Output level range (FF): Up to 90dB
Insert masking output: 90dBHL max (250-4KHz)
Output level accuracy: Within 3dB
Output level step size: 2.5 or 5dB
Output transducer (AC): DD45 earphones (supplied)
E-5A insert earphones (option)
Output transducer (BC): B-71 bone vibrator (supplied)
Tone present: Single, pulsed, warble or continuous
Masking: Narrowband (tone) or speech-weighted
Clinical tests: Stenger & ABLB (Fowler)
Communication: Integral talk over and talk back facility
Recorded speech: Tape or CD input
Live speech: 1 x microphone input
Monitoring indicator: VU - (to IEC 60268-17; ANSI S3.6:2004)
NOAH interface: Transfer of AC, BC & ULL test results

Page 18 OM023-4 Amplivox 260 Operating Manual
5.2 Maximum hearing levels provided at each frequency
Frequency, Hz
Air conduction, dBHL
Bone conduction, dBHL
125
80
-
250
100
45
500
115
60
750
120
65
1000
120
70
1500
120
70
2000
120
70
3000
120
70
4000
115
70
6000
110
50
8000
100
40
5.3 Physical Data
Display: 2 lines of 24 characters
Mains power: 100-240Vac; 50/60Hz; 0.4A
Dimensions: 270mm wide x 175mm deep x 68mm high
Weight: 830g
Safety: IEC 60601-1 (plus UL, CSA & EN deviations)
EMC: IEC 60601-1-2
CE mark: To the EU Medical Device Directive
5.4 Equipment classification
Type of protection against electric shock Powered via SELV
ClassII mains adapter
Degree of protection against electric shock Type B applied part
Degree of protection against ingress of water Not protected
Mode of operation Continuous operation
Equipment mobility Portable
The Model 260 Audiometer is classified as a Class IIa device under Annex
IX of the EU Medical Devices Directive. It is intended for use as a
diagnostic audiometer instrument.