Welch Allyn AM 232 Operating Instructions Manual

Marca: Welch Allyn

Modello: AM 232

Tipo: Operating Instructions Manual

12-16-08

AM 232

Manual Audiometer

Operating Instruction Manual

Part Number 1717-0101 - Rev. 05

12-16-08

CE Mark per Medical Device Directive (93/42/EEC)

Electromagnetic compatibility (EMC)

12-16-08

Table of contents

Electromagnetic compatibility (EMC) 2

Table of contents 3

Service and repair 5

Recalibration 5

Warranty 5

Rechargeable battery warranty 5

Safety notes 6

Specifications 7

Standards 7

Chapter 1

Introduction 9

Unpacking and inspection 10

Accessories supplied 10

Connectors, Controls, Indicators 11

Front panel controls and indicators (see Figure 1) 11

Rear panel connectors and indicators (see Figure 2) 12

Installation 14

Pretest procedure 15

Pretest noise recovery period 15

Elimination of ambient noise 16

Permissible noise levels 16

Disposal of non-contaminated electrical and electronic equipment

directive 2002-96-EC-WEEE 17

Chapter 2

Battery Option 19

NiCad BATTERY OPERATION 20

Recharging NiCad batteries 21

Replacing NiCad batteries 22

Alkaline battery installation/operation 23

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Chapter 3

Operation 25

Preliminary check 26

Instructing the subject 27

Placing the earphones 27

Response handswitch 27

Audiogram form 28

Routine calibration check 29

Routine test administration 30

HL control (F3) 30

Range Extension pushbutton (F2) 30

Tone Type Selector (F9) 30

Typical testing session 31

Pretest Review 31

Familiarization 31

Determining the threshold (Pure Tone) 32

Testing procedure 32

Chapter 4

Routine Maintenance 33

Calibration 34

Earphone cords 34

Hum and random noise 35

Distortion and frequency shift 35

Special messages 35

CAL 35

Exx 36

Bibliography 37

12-16-08

Service and repair

Technical Service Department Technical Service Department

Welch Allyn, Inc. Welch Allyn Canada Limited

4341 State Street Road 160 Matheson Boulevard, East

Skaneateles Falls, NY 13153-0220 Mississauga, Ontario, Canada L4Z 1V4

Tel.: 1-800-535-663 (in U.S.A. only) Tel.: 1-800-561-8797 (in Canada only)

Recalibration

Welch Allyn recommends that the AM 232 Manual Audiometer be recalibrated

annually. Arrangements may be made by returning the instrument registration card or

by contacting Welch Allyn’s Technical Service Department (as listed above). A

moderate fee is charged for recalibration.

Warranty

Note: Return of the instrument registration card is required for proof of purchase

and warranty validation.

Welch Allyn, Inc. warrants the AM 232 Manual Audiometer to be free of original

defects in material and workmanship and to perform in accordance with

manufacturer’s specifications for a period of one year from the date of purchase. If

this instrument or any component thereof is found to be defective or a variance from

the manufacturer’s specifications during the warranty period, Welch Allyn will repair,

replace or recalibrate the instrument or component(s) at no cost to the purchaser.

This warranty only applies to instruments purchased new from Welch Allyn or its

authorized distributors or representatives. The purchaser must return the instrument

directly to Welch Allyn or an authorized distributor or representative and bear the

costs of shipping.

This warranty does not cover breakage or failure due to tampering, misuse, neglect,

accidents, modification or shipping, and is void if the instrument is not used in

accordance with manufacturer’s recommendations or if repaired or serviced by other

than Welch Allyn or a Welch Allyn authorized representative.

No other express or implied warranty is given.

Rechargeable battery warranty

Welch Allyn nickel-cadmium batteries are guaranteed by Welch Allyn for two years

from date of manufacture (when used in Welch Allyn instruments only). Defective

batteries will be replaced on a pro rata basis should failure occur prior to expiration

data on battery.

12-16-08

Safety notes

WARNING

The AM 232 Manual Audiometer is designed to be used

with a hospital grade outlet. Injury to personnel or damage to equipment

can result when a three-prong or two-prong adapter is connected be-

tween the AM 232 Manual Audiometer power plug and an AC outlet or

extension cord. Additionally, the AM 232 Manual Audiometer is equipped

with a specific power transformer which should not be interchanged with

any other transformer or supply.

This symbol indicates the location of a service adjustment part and

is intended for service personnel only. The AM 232 Manual Audiometer is

a specifically calibrated audiometer and the periodic service and adjust-

ments for the instrument that may be required should be done only by an

authorized Welch Allyn service technician.

CAUTION

The AM 232 Manual Audiometer is designed to comply

with the EMC requirements according to IEC 60601-1-2.

Radio transmitting equipment, cellular phones, etc. shall not be used in

the close proximity of the device since this could influence the perfor-

mance of the device. Particular precaution must be considered during

use of strong emission sources such as High Frequency surgical equip-

ment and similar device so that e.g., the HF-cables are not routed on or

near the device. If in doubt, contact a qualified technician or your local

representative. Refer to the Electromagnetic Compatibility (EMC) Guide

on CD 482-638702.

12-16-08

Specifications

Standards

The AM 232 Manual Audiometer meets ANSI S3.6 and IEC 645 Type 4 Audiometer

Standards.

UL 60601-1 Medical Electrical Equipment Requirements for Safety

IEC/EN 60601-1 General Requirements

CSA C22.2 No.601-1-M90

Protective Classification

This system is intended for continuous operation and has a protective classification

of Class II, Type B.

Class II Type B

equipment symbols

Degree of protection against harmful ingress of water: Ordinary (no protection)

Frequency Range

Discrete Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000 Hz

Accuracy: ±3%

Total Harmonic Distortion: <2%

Intensity

Ranges: 125 Hz: -10 to 50 dB HL

500 to 6000 Hz: -10 to 90 dB HL

250 and 8000 Hz: -10 to 70 dB HL (Increments of 5 dB steps)

Note: A “+10” dB switch extends maximum at all frequencies by 10 dB.

Accuracy: 125 to 4000 Hz: ±3 dB

6000 to 8000 Hz: ±5 dB

Signal to Noise Ratio: >70 dB

Tone Type

Rise/Fall Time: 20-50 msec

Continuous: Steady when present bar depressed

Pulsed: 2.5 pulse/sec

FM: 5 Hz, ±5%

Head set

Telephones TDH39 Earphones with MX41AR Cushions (60 ohm impedance).

12-16-08

Power

Line Voltage: 100-240 V (±10%) Note: Desktop power supply

Range: 50-60 Hz (± 5%)

Consumption: 9 Watts

Battery

Types: Rechargeable (NiCad) or Non-Rechargeable (Alkaline)

Range: 7.0 V - 9.0 V

Capacity: NiCad - 22 hours continuous operations

Alkaline - 45 hours continuous operations

Environmental

Temperature:

Operating: 60° F to 105° F (15° C to 40° C)

Powerline Storage: -40° F to 140 ° F (-40° C to 60° C)

Battery Storage: -40° F to 105° F (-40° C to 40° C)

Humidity: 5% to 90%

Warm-up Time: 10 minutes for instruments stored at room temperature

Mechanical

Dimensions: 13.25" W x 14" D x 3.75" H

(33.66 cm x 35.56 cm x 9.53 cm)

Weight 5.6 lb (2.53 kg) net

8 lb (3.64 kg) shipping

10 lb (4.55 kg) shipping with battery included

Supplied Accessories Catalog Numbers

Test headset (TDH39) 23223

Audiogram Forms (1 pad of 50) 52300

Instruction Manual 232001

AC Power Module 8000-0246

Optional Accessories

Response Handswitch 23220

Patch Cord, 2 Conductor 23221

Audiocups 23222

Replacement NiCad Battery Only 72320

Battery Pack Assembly 72329

Battery Pack includes Welch Allyn supplied NiCad battery. May also be used

with six (6), Size C, Alkaline batteries (not included) Replacement NiCad

Catalog Listings

AM 232 Manual Audiometer, AC Power (USA) 23200

AM 232 Manual Audiometer, AC Power and Battery (USA) 23210

AM 232 Manual Audiometer , AC Power (Export) 23205

AM 232 Manual Audiometer, AC Power and Battery (Export) 23215

12-16-08

Chapter 1

Introduction

The AM 232 Manual Audiometer is a single-channel, pure tone, air conduction,

portable instrument designed to provide basic audiometric screening capability for

physicians’ offices, schools and industry. The lightweight design allows easy

transport to a variety of testing locations, and the built-in storage cavity and case

provide enough room to contain all instrument accessories. The clearly labeled front

panel controls and full frequency range make accurate, reliable testing a simple matter

for any user.

The AM 232 Manual Audiometer is a precisely designed and calibrated instrument.

With proper care it will deliver accurate sound-pressure levels to subject ears for your

hearing screening program.

Note: The AM 232 Manual Audiometer should be recalibrated yearly (or sooner if a

problem develops). See Chapter 4.

12-16-08

Unpacking and inspection

Although your AM 232 Manual Audiometer was carefully tested, inspected and

packed for shipping, it is good practice after receiving the instrument to immediately

examine the exterior of the container for any signs of damage. Notify your carrier if

any damage is noted.

Carefully remove your AM 232 Manual Audiometer from its shipping container. If

the instrument appears to have suffered mechanical damage, notify the carrier

immediately so that a proper claim can be made. Be certain to save all packing

materials so that the claim adjuster can inspect it as well. As soon as the carrier has

completed the inspection, notify your Welch Allyn representative.

If the instrument must be returned to the factory, repack it carefully (in the original

container if possible) and return it prepaid to the factory for necessary adjustments.

Check that all accessories itemized in Accessories supplied below are received in

good condition. If any accessories are missing, contact Welch Allyn immediately.

See the Specifications section for the catalog numbers of accessories and also for a

listing of optional accessories.

Accessories supplied

Test Headset Assembly (TDH39)

Audiogram Pad (1 pad of 50)

Battery Pack Assembly (used with #23210 and #23215 models only)

AC power cord

12-16-08

Connectors, Controls, Indicators

Figure 1: Front panel.

Front panel controls and indicators (see Figure 1)

F1 - Power switch and indicator for ON and OFF .

F2 - Range extension pushbutton allows you to increase the stimulus intensity 10 dB

above the standard maximum HL at any frequency. When in use, a “+” appears

on the LCD.

F3 - HL control for setting stimulus intensity level. Level is indicated on LCD.

F4 - Present bar for stimulus presentation.

F5 - Stimulus being presented via an earphone. Presentation indicated by illuminated

green LED.

F6 - Subject response indicator shows you when the test subject has pressed the

handswitch button by an illuminated green LED (with optional handswitch only).

F7 - Control for setting stimulus frequency. Frequency is indicated in the window

adjacent to the control.

F8 - Routing switch for stimulus presentation to the earphone. Left or right indicated

by illustration of subject.

F9 - Switch for setting the stimulus tone type.

FM = warble tone

__ = steady tone

- - - = pulsed tone

F10 - Low battery indicator to alert you of a limited operating time. Recharge or

replace batteries (dependent on whether NiCad or Alkaline batteries are used).

12-16-08

Rear panel connectors and indicators (see Figure 2)

Figure 2: Rear panel.

R1 - Power input jack (5-pin DIN Connector) with front panel illustration showing its

location and a rear panel label giving the input power specifications.

R2 -

Attention, consult accompanying document for instructions or warnings

pertaining to these parts.

R3 - Earphone output jacks (standard phone jacks). Front panel illustration shows

left and right phone.

R4 - Response handswitch input jack (standard phone jack) with front panel illustra-

tion showing location.

R5 - Entry by qualified service personnel only.

Note: The above symbol is located inside the storage compartment. It denotes a

Type B, Class II product per IEC 878 as referenced in IEC 60601-1.

12-16-08

Note: There is a symbol on the bottom panel (marked B1 in Figure 3) that indicates

entry by qualified service personnel only.

Figure 3 : Bottom panel.

12-16-08

Installation

1. Plug the power cord into the appropriate jack (R1) on the back panel of the

instrument.

2. Plug the other end into a line power (mains) outlet.

3. Plug the earphones into the earphone jacks (R3) on the rear panel. Note the

symbol along the top of the front panel, which indicates which is right (RED) and

which is left (BLUE).

4. Turn the power switch to ON.

Note: For battery operation, please refer to Chapter 2.

12-16-08

Pretest procedure

Note: The AM 232 is a versatile audiometer designed for use in doctor offices,

schools, industrial settings, the military, etc. The generic term “subject” used in this

manual is used to identify the person whose hearing is being evaluated.

Any program aimed at obtaining reliable records of hearing thresholds should be

staffed and supervised by appropriately-trained individuals. Training courses

leading to certification are available for audiometric technicians in most urban areas.

Two prerequisites are of particular importance to the procurement of reliable audio-

grams:

• Prior to testing, allow adequate time for the subject to recover from the effects of

a previous exposure to high-level sound.

• Tests should be performed in a quiet area.

Pretest noise recovery period

Exposure to high levels of sound (unmuffled lawn mowers, power tools, loud music,

gunfire, etc.) tends to create a temporary threshold shift (TTS), which diminishes with

time after exposure. Any subject tested soon after such exposure may manifest a

hearing loss that does not reflect the subject’s normal hearing threshold. It is,

therefore, important that the testing procedure prescribe some time interval - usually

at least 16 hours - between the last exposure to high-level sound and the administra-

tion of any hearing test.

12-16-08

Elimination of ambient noise

Excessive noise in the test environment such as that produced by conversation,

typewriters, or other machines also reduces test validity because it tends to mask the

test signals particularly at the lower frequencies where earphone cushions provide

less effective attenuation. An acoustically tested room may be required if ambient

noise at the subject’s ears reaches objectionable levels - i.e., sufficient to cause

apparent hearing loss at the low frequencies. Also, Audiocups are available from

Welch Allyn as an optional accessory. If the test subject is in the same room as the

audiometer, it is recommended that the subject be seated about 1 meter (-3 ft) away

from the instrument.

Maximum permissible test environment sound-pressure levels are specified by

American National Standard Criteria for Permissible Background Noise during

Audiometric Testing, S3.1-1977 (revised). Table 2 shows the maximum background

levels that can be present inside the room while a valid hearing test is being con-

ducted. For more comprehensive information about hearing testing and hearing

conservation, refer to the Bibliography.

Permissible noise levels

Test Tone Frequency (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000

Test Room

* 34.0 22.5 19.5 21.5 26.5 26.5 28.0 33.5 34.5 38.0 43.5

Test Room

** 29.0 17.5 14.5 16.5 21.5 21.5 23.0 28.5 29.5 33.0 38.5

*Ears covered maximum permissible octave band levels.

**Ears covered maximum permissible one-third octave band levels.

12-16-08

English Do not dispose of this product as unsorted municipal waste. Prepare this product for reuse or separate collection as

specified by Directive 2002/96/EC of the European Parliament and the Council of the European Union on Waste

Electronic and Electrical Equipment (WEEE). If this product is contaminated, this directive does not apply.

For more specific disposal information, see www.welchallyn.com/weee, or contact Welch Allyn Customer Service at

+44 207 365 6780.

esky Tento výrobek nelikvidujte s net

íd

ným domovním odpadem. P

ipravte ho k novému použití nebo do sb

separovaného odpadu podle sm

rnice Evropského parlamentu a Rady Evropské unie

íslo 2002/96/EC o likvidaci

elektronických a elektrických za

ízení (Waste Electronic and Electrical Equipment, WEEE). Pokud je výrobek

kontaminován, tato sm

rnice pro n

j neplatí.

Podrobn

jší sm

rnice o likvidaci najdete na adrese www.welchallyn.com/weee nebo zavolejte odd

lení služeb

zákazník

spole

nosti Welch Allyn na

ísle +353 46 9067790.

Dansk Produktet må ikke bortskaffes som usorteret husholdningsaffald. Produktet skal forberedes til genbrug eller særskilt

indsamling som angivet i Europa-Parlamentets og Rådets Direktiv 2002/96/EF om affald af elektrisk og elektronisk

udstyr (WEEE). Hvis produktet er kontamineret, gælder Direktivet ikke.

Yderligere oplysninger om bortskaffelse fås på www.welchallyn.com/weee eller ved at kontakte Welch Allyn

Kundeservice på +353 46 9067790

Deutsch Dieses Produkt darf nicht mit unsortiertem Hausmüll entsorgt werden. Bereiten Sie dieses Produkt zur

Wiederverwertung oder zur getrennten Sammlung entsprechend der Richtlinie 2002/96/EG des Europäischen

Parlaments und des Rats der Europäischen Union über Elektro- und Elektronik-Altgeräte (WEEE-Richtlinie) vor. Diese

Richtlinie gilt nicht bei Kontamination des Produkts.

Detailliertere Informationen zur Entsorgung finden Sie unter www.welchallyn.com/weee bzw. erhalten Sie beim

Kundendienst von Welch Allyn unter der Telefonnummer +49 7477 92710

Español No deseche este producto como residuos municipales sin clasificar. Prepare este producto para su reutilización o

recogida selectiva como se especifica en la Directiva 2002/96/CE del Parlamento Europeo y el Consejo sobre

residuos de aparatos eléctricos y electrónicos (RAEE). Si este producto está contaminado, no se aplica esta directiva.

Para obtener información más específica sobre los desechos, consulte www.welchallyn.com/weee o póngase en

contacto con el servicio de atención al cliente de Welch Allyn llamando al +34 91 7499357.

Eesti keeles Ärge vabanege antud tootest kui sorteerimata olmejäätmest. Valmistage toode ette korduvkasutamiseks või

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Täpsemat teavet jäätmekõrvaldamise kohta saab www.welchallyn.com/weee või võtke ühendust Welch

Allyn‘ klienditeenindusega telefonil +353 46 9067790.

ǼȜȜȘȞȚțȐ

ȂȘȞ

ĮʌȠȡȡȓʌĲİĲİ

ĲȠ

ʌȡȠȧȩȞ

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įȘȝȠĲȚțȐ

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ȆȡȠİĲȠȚȝȐıĲİ

ĲȠ

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ȩʌȦȢ

țĮșȠȡȓȗİĲĮȚ

ıĲȘȞ

ȅįȘȖȓĮ

2002/96/

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ĲȠȣ

ǼȣȡȦʌĮȧțȠȪ

ȀȠȚȞȠȕȠȣȜȓȠȣ

țĮȚ

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www.welchallyn.com/weee

İʌȚțȠȚȞȦȞȒıĲİ

ȝİ

ĲȘȞ

ǼȟȣʌȘȡȑĲȘıȘ

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ĲȘȢ

Welch Allyn

ıĲȠ

ĲȘȜȑĳȦȞȠ

+44 207 365 6780.

Français Ne mettez pas au rebus ce produit avec les ordures ménagères non triées. Préparez-le en vue d'un recyclage ou d'une

collecte séparée, comme stipulé par la Directive 2002/96/EC du Parlement européen et du Conseil de l'Union

européenne sur les déchets d'équipements électroniques et électriques (WEEE). Cette directive ne s'applique pas si le

produit est contaminé.

Pour des informations plus spécifiques sur la mise au rebus, visitez le site www.welchallyn.com/weee, ou contactez le

service clientèle Welch Allyn au +33 1 55695849.

Disposal of non-contaminated electrical and

electronic equipment directive 2002-96-EC-WEEE

12-16-08

Italiano Non smaltire questo prodotto con i normali rifiuti. Approntare il prodotto per il riutilizzo oppure smaltirlo in modo

differenziato, in base a quanto stabilito dalla Direttiva 2002/96/EC del Parlamento Europeo e del Consiglio dell'Unione

Europea in materia di smaltimento delle apparecchiature elettriche ed elettroniche (WEEE). Se il prodotto è

contaminato, tale direttiva non viene applicata.

Per ulteriori informazioni sui metodi di smaltimento, visitare il sito Web all'indirizzo www.welchallyn.com/weee oppure

contattare l'assistenza clienti Welch Allyn al numero +39 02 69682425.

Lietuvi

k. Neišmeskite šio gaminio kartu su ner

šiuotomis miesto atliekomis. Paruoškite š

gamin

pakartotinam naudojimui ar

surinkimui atskirai, kaip nurodyta Europos Parlamento ir Tarybos direktyvoje 2002/96/EB d

l elektros ir elektronin

rangos atliek

(EE

A). Jei gaminys yra užkr

stas, direktyva jam netaikoma.

Nor

dami gauti daugiau specifin

s informacijos, žr. www.welchallyn.com/weee, arba susisiekite su Welch Allyn

Klient

aptarnavimo skyriuje +353 46 9067790.

Magyar Ne dobja ki a terméket a települési vegyes hulladékgy

be. A terméket az újrafelhasználási vagy egyéb, speciálisan

ilyen célokra kijelölt gy

helyen kell leadni, az Európai Parlament és a Tanács elektromos és elektronikai

berendezésekb

l származó hulladékról (WEEE) szóló, 2002/96/EK számú irányelvének megfelel

en. Ha a termék

befert

dött, az említett irányelv rendelkezései nem vonatkoznak a kidobására.

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illetve érdekl

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Nederlands Dit product mag niet worden weggegooid bij niet-gesorteerd huishoudelijk afval. Het product moet worden

geprepareerd voor hergebruik of gescheiden inzameling conform de richtlijn 2002/96/EC van het Europees parlement

en de Raad van de Europese Unie inzake de verwerking van elektrisch en elektronisch afval (WEEE - Waste

Electronic and Electrical Equipment). Deze richtlijn is niet van toepassing indien het product is verontreinigd.

Ga voor specifieke instructies voor afvalverwijdering naar www.welchallyn.com/weee, of neem contact op met de

klantenservice van Welch Allyn op het nummer +31 15 7505000

Norsk Produktet skal ikke kastes som restavfall. Produktet skal leveres for gjenbruk eller som spesialavfall i henhold til

Europaparlamentets og EU-rådets direktiv 2002/96/EF om avfall fra elektronisk og elektrisk utstyr (WEEE). Hvis

produktet er forurenset, gjelder ikke dette direktivet.

Se www.welchallyn.com/weee eller kontakt Welch Allyn kundeservice på +44 207 365 6780 for nærmere opplysninger

om avfallshåndtering.

Polski Nie nale

y wyrzuca

tego produktu razem z nieposortowanymi odpadami komunalnymi. Nale

y przygotowa

go do

ponownego wykorzystania lub rozdzieli

jego elementy, zgodnie z Dyrektyw

nr 2002/96/WE Parlamentu

Europejskiego i Rady w sprawie zu

ytego sprz

tu elektrycznego i elektronicznego (WEEE, Waste Electronic and

Electrical Equipment). Ta dyrektywa nie ma zastosowania, je

li produkt jest ska

ony.

Szczegółowe informacje na temat usuwania mo

na znale

Ĩü

na stronie www.welchallyn.com/weee lub uzyska

biurze obsługi klienta firmy Welch Allyn pod numerem +353 46 9067790

Português Não elimine este produto como lixo urbano indiferenciado. Prepare este produto para reutilização ou recolha

diferenciada em conformidade com a Directiva 2002/96/EC do Parlamento Europeu e do Conselho da União Europeia

sobre Reciclagem de Resíduos Eléctricos e Electrónicos (WEEE). Se este produto estiver contaminado, esta directiva

não será aplicável.

Para obter informações mais específicas sobre a eliminação de resíduos, consulte www.welchallyn.com/weee ou

contacte Welch Allyn Customer Service no número +353 46 9067790

Suomi Älä hävitä tätä tuotetta lajittelemattoman yhdyskuntajätteen mukana. Tuote on kierrätettävä tai vietävä erilliseen

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2002/96/EY mukaisesti. Jos tuote on saastunut, direktiivi ei koske sitä.

Lisätietoja tuotteiden hävittämisestä saa käymällä osoitteessa www.welchallyn.com/weee tai ottamalla yhteyttä Welch

Allynin asiakaspalveluun, puh. +44 207 365 6780.

Svenska Kassera inte denna produkt som osorterat kommunalt avfall. Förbered denna produkt för återanvändning eller särskild

insamling enligt Europaparlamentets och rådets direktiv 2002/96/EG om avfall som utgörs av eller innehåller elektriska

eller elektroniska produkter (WEEE). Om denna produkt är kontaminerad gäller inte detta direktiv.

Gå in på www.welchallyn.com/weee eller kontakta kundtjänsten hos Welch Allyn på +46 42330220 för mer information

om kassering.

12-16-08

Chapter 2

Battery Option

This chapter describes the battery option of the AM 232 Manual Audiometer. It

pertains only to those customers who purchased Models #23210 or #23215 with the

battery pack installed or to those who later purchased the #72329 Battery Pack

Assembly. In both cases, a rechargeable NiCad battery is included.

12-16-08

NiCad BATTERY OPERATION

The AM 232 Manual Audiometer battery option is supplied with an installed,

rechargeable NiCad battery pack. It requires about 18 hours to charge fully, which will

provide about 22 hours of continuous operation. The green LED on the pack itself

illuminates when charging is in progress. The words LO BAT illuminates on the front

panel LCD when the battery charge is getting low, alerting you to recharge the

batteries. When LO BAT appears, the instrument will operate (continuously) for

about two more hours before it shuts down completely.

Note: In no instance will loss of battery power affect the instrument calibration.

To save battery life, the AM 232 Manual Audiometer has a special “Sleep Mode” in

which the instrument will shut down after 5 minutes of no operation. You will know

the instrument is “asleep” because the LCD will show three dash lines (- - -). To

“wake up” the instrument, press the Present bar. There is no danger of presenting a

loud tone to the test subject when the instrument “wakes up” because no tone is

presented until the Audiometer is awake. In addition, the instrument automatically

resets its output to 0 dB HL.

If the AM 232 Manual Audiometer is operated until the battery charge has dropped

below an acceptable voltage level, the instrument will cease to function. The display

will be blank except for the LO BAT indication, and the controls will cease to

function. To restore operation, the batteries must be recharged for some period of

time, up to 18 hours (full charge), or line power (mains) may be used. If the Audiom-

eter is operated off of line power (mains) with the rechargeable batteries in place,

some battery charging will occur.

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Welch Allyn AM 232 Operating Instructions Manual

Marca: Welch Allyn

Modello: AM 232

Tipo: Operating Instructions Manual

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