Welch Allyn AM282 Audiometer FM AC PW dB HL R Hz R + 10dB L R dB HL Hz SI S3.6 Ref. AN 9 / ISO 38 Directions for use Part Number 28204 Rev.
ii Welch Allyn AM282 Audiometer ©2010 Welch Allyn. All rights are reserved. To support the intended use of the product described in this publication, the purchaser of the product is permitted to copy this publication, for internal distribution only, from the media provided by Welch Allyn. No other use, reproduction, or distribution of this publication, or any part of it, is permitted without written permission from Welch Allyn.
Directions for use Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Unpacking and inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Supplied Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Recycling / disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Welch Allyn AM 282 Audiometer
1 1 Introduction The AM282 Audiometer is a single-channel, pure tone, air conduction, portable instrument designed to provide basic audiometric screening capability for physicians' offices and industry. The lightweight design allows easy transport to a variety of testing locations. The clearly labeled front panel controls and full frequency range make accurate, reliable testing a simple matter for any user. The AM282 Audiometer is a precisely designed and calibrated instrument.
2 Introduction Welch Allyn AM282 Audiometer 28202 AM282 Carry Case 28207 AM282 Power Plug 28201 AM282 Power Supply 28206 Threshold Audiometry Card Optional Accessories 23220 Audiometry Patient Response Switch 23221 Audiometry Single Patch Cord, 2-Conductor 23222 Audiometry Audiocups WARNING To ensure patient safety and optimal product performance, use only Welch Allyn recommended accessories and supplies Recycling / disposal Caution Many local laws and regulations require special procedure
Directions for Use Introduction 3 Safety Notes WARNING The AM282 is designed for compliance to IEC and UL 60601-1 when used in the patient vicinity. To achieve this compliance, use of hospital grade plug and receptacles are required. For patient and operator safety, the AM282 must be used with properly grounded plug and receptacles at all times.
4 Introduction Welch Allyn AM282 Audiometer WARNING Do NOT use in the presence of flammable gaseous mixtures. Users should consider the possibility of explosions or fire when using this device in close proximity to flammable anesthetic gases. WARNING Periodically, have a service technician perform electrical safety checks on the unit in order to show continued compliance to IEC and UL 60601-1.
Directions for Use Introduction Installation 1. Plug the power cord into the appropriate jack (R5) on the rear panel. 2. Plug the power cord from the Power Module into a line power (mains) outlet. 3. Plug the earphones into the earphone jacks on the rear panel. R3 is for the right and R4 is for the left earphone/insert phone. 4. Turn the power switch to ON (R6). Rear panel connectors R1 Covered by a sticker and intended for service personnel only.
6 Introduction Welch Allyn AM282 Audiometer Symbol Description Symbol for “CATALOG NUMBER.” Stand-by. Right Ear. Left Ear. Patient Response Button. AC Power WARNING Do not turn on/off system power while a patient is wearing the headsets or internal earphones. WARNING Use only the provided power supply. The AM282 Audiometer provided power supply should only be connected to a power source meeting the following range: 90-246VAC, 47-63Hz.
Directions for Use Introduction Controls and indicators F1 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. F2 Liquid Crystal Display (LCD). F3 Selects steady stimulus tone type. The symbol corner of the display when selected. F4 Selects pulsed stimulus tone type. The symbol of the display when selected. F5 Selects frequency modulated stimulus tone type.
8 Introduction Welch Allyn AM282 Audiometer LCD display Legend Icons/LEDs 1 AC PWR 2 SW VERSION Description Indicates power is on. Indicates the current software version. 3 When displayed, the stimulus is being presented. 4 When displayed, an additional 10dB is available at the test frequency. 5 When displayed, indicates the Patient Response button is being pressed. 6 R 7 8 Stimulus is being presented to the right ear. Stimulus frequency indicator.
Directions for Use Introduction 9 AC power An AC power supply can be purchased to use with the AM282 Audiometer. WARNING Use only the Welch Allyn provided power supply. The AM282 Audiometer provided power supply should only be connected to a power source meeting the following range: 90-246VAC 47-63Hz. In North America, the power source should be a maximum 120VAC. Connecting the AC power 1. Ensure the system is turned off while connecting the AC Power. 2.
10 Introduction Welch Allyn AM282 Audiometer Low battery indicator When there is approximately 1 hour of battery time left, the on the screen. icon will be displayed When the battery can no longer provide enough power to operate the AM282 Audiometer, the word OFF will be displayed on the LCD and the system will no longer function. At that point, replace the batteries (with new or fully charged batteries) or use the AC Power Module to continue testing.
Directions for Use Introduction 11 Inserting new batteries Before inserting new batteries in the battery compartment, always inspect batteries for leakage and do not use batteries that show any signs of damage. 1. Insert the batteries starting with the battery slot farthest from the slot that is not used. Be sure to match the + side of the battery with the marked + side for each battery slot. 2.
12 Introduction Welch Allyn AM282 Audiometer
13 2 Operation Preliminary check Throughout this chapter are references to front panel (F) and rear panel (R) connectors, controls and indicators. Please refer to“Rear panel connectors” on page 5, “Controls and indicators” on page 7 and “LCD display” on page 8 of this manual for specific descriptions and locations. 1. Prior to testing, ensure that the power cord or the batteries are in place and earphone cords are plugged in securely. 2. Turn the audiometer on. 3.
14 Operation Welch Allyn AM282 Audiometer • Tests should be performed in a quiet area. WARNING 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. Test environment Excessive noise in the test environment can reduce test validity by masking test tones.
Directions for Use Operation a. 15 Eliminate all obstruction between earphone and subject (hair, eyeglasses, earrings, hearing aids, etc.). b. Adjust the headband so the earphone cushions are centered over the ears and head. The earphone cushions will put firm pressure on both ears. Response handswitch If the optional response handswitch is used ensure that the plugs and jacks are properly connected.
16 Operation Welch Allyn AM282 Audiometer To confirm the selection push the earphones, press the button again. To make the selection for insert button and the insert earphone icon will flash on the LCD. To confirm the selection push the button again. See “Appendix A” on page A for applied reference threshold values (RETSPL) for both the external headset and the internal earphones. HL knob The HL knob increases or decreases the signal intensity in 5 dB increments.
Directions for Use Operation 17 2. Select the L or R pushbutton to route the test tone to the selected ear. 3. Demonstrate the 1000 Hz tone at a 50 dB level. The tone duration should be between 1 and 2 seconds. 4. Repeat at 40 dB Hz. Determining the threshold (Pure Tone) 1. Present the first tone at 50 dB in the subjects better ear, or if no preference, the right ear. Decrease the intensity in 10dB steps until the subject no longer responds.
18 Operation Welch Allyn AM282 Audiometer
19 3 Routine Maintenance Preventive maintenance To maximize the service life of the audiometer and headset, the following is recommended. 1. Turn the instrument off when not in use. 2. Dust the instrument occasionally with a soft, dry cloth. 3. Wipe the headset cords and ear cushions occasionally with a warm damp cloth. 4. Leave the earphones connected to the audiometer permanently to minimize straining the connections.
20 Routine Maintenance Welch Allyn AM282 Audiometer 2. Conduct similar tests with several young adults on whom subsequent retests may be made. Record the results on the audiogram forms. 3. File these audiogram forms where they will be readily available for comparison with future results.
Directions for Use Routine Maintenance 21 Special messages The AM282 Audiometer performs a self-check each time the instrument is turned on (the self-check does not occur when instrument operation resumes from the “sleep mode”). Certain messages will be displayed on the front panel LCD if any error in the instrument operation is detected. These messages are described below. Cal When a transducer or frequency is selected that has a calibration error (e.g.
22 Routine Maintenance Welch Allyn AM282 Audiometer
23 4 Standards, Specifications, and Accessories Standards and Compliance The AM282 meets ANSI S3.6 (2004) Specification for Audiometers (Type 4) IEC 60645-1 (2002) Electroacoustics - Audiological Equipment - Pure Tone Audiometers (Type 4) IEC 60601-1 (2003) Medical Electrical Equipment Part 1 - General Requirements for Safety UL 60601-1 Medical Electrical Equipment, Part 1 -General Requirements for Safety CAN/CSA-C22.2 No. 601.
24 Standards, Specifications, and Accessories Welch Allyn AM282 Audiometer 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: Capacity: ±5%, 5 Hz, Triangular modulation Minimum of 10 hours of power for either battery type. Head set DD45 External Headset Earphones with Type 51 Cushions (10 ohm impedance).
Directions for Use Standards, Specifications, and Accessories 25 Mechanical Dimensions: 12.59" W x 8.76" D x 3.18" H (32 cm W x 22.3 cm D x 8.1 cm H) Weight 2.55 lbs (1.16 Kg) with 5 AA batteries Electromagnetic Compatibility Electromagnetic compatibility (EMC) Please refer to the Electromagnetic Compatibility Reference Guide on CD (part number 482-6387xx) for EMC information concerning your system.
26 Standards, Specifications, and Accessories Welch Allyn AM282 Audiometer
A A Appendix A DD45 External Headset RETSPL Values for NBS 9A Coupler Frequency (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 R/L (dB) 47.5 27.0 13.0 6.50 6.0 8.0 8.0 8.0 9.0 20.5 12.0 ANSI S3.6 and ISO 389.2 Reference Thresholds for ER3A/ER5A Internal Earphones with Rigid Tube Frequency (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 R/L (dB) 26 14.0 5.5 2.0 0 2.0 3.0 3.5 5.5 2.
B Appendix A Welch Allyn AM282 Audiometer Bibliography ANSI S3.6 (2004) Specification for Audiometers (Type 4) Criteria for Permissible Ambient Noise During Audiometric Testing (ANSI S3.1 -1977) Methods for Manual Pure-Tone Threshold Audiometry (ANSI S3.21 - 1978) Michael, P.L., and Bienvenue, G.R., “Noise Attenuation Characteristics of SupraAural Audiometric Headsets Using the Models MX41/AR and 51 Earphone Cushions,” J. Accoust. Soc. Am., 70(5), Nov. 1981, 1235-1238 Newby, H.A., Audiology (4th ed.
