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Summary of Contents for Welch Allyn AM 232
- Page 1 Audio Menu Service Manual Operating Instructions...
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Page 2: Table Of Contents
Contents Section 1 — Introduction Description ..............1 Unpacking and Inspection ..........1 Connectors, Controls and Indicators ......2 1.3.1 The Front Panel Controls and Indicators (Fig. 1-1) ..3 1.3.2 Rear Panel Connectors and Indicators (Fig. 1-1) ..3 1.3.3 Symbols .............. -
Page 3: Section 1 - Introduction
Section 1 — Introduction 1.1 DESCRIPTION The Welch Allyn AM 232 Manual Audiometer is a single-channel, pure tone, air conduction, portable instrument designed to provide basic audiometric 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. -
Page 4: Connectors, Controls And Indicators
1.3 CONNECTORS, CONTROLS AND INDICATORS FIGURE 1-1: Front and Rear Panel LO BAT Front Panel 12 VDC 200 MM Rear Panel... -
Page 5: The Front Panel Controls And Indicators (Fig. 1-1)
1.3.1 The Front Panel Controls and Indicators (Figure 1-1) F1 Power switch and indicator for ON and OFF F2 Range extension push-button allows operator 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. -
Page 6: Installation
1.4 INSTALLATION 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 between the AM 232 Manual Audio- meter power plug and an AC outlet or extension cord. -
Page 7: Pre-Test Noise Recover Period
—i.e., sufficient to cause apparent hearing loss at the low frequencies. Also, Audiocups are avail- able 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 one meter (3 ft) away from the instrument. -
Page 8: Section 2 - Battery Option
Section 2 — Battery Option 2.1 DESCRIPTION This section describes the battery option of the AM 232 Manual Audio- meter. 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. -
Page 9: Recharge Nicad Batteries
18 hours required for a full charge, the batteries should not be left charging for extended periods (i.e., several days) because the useful life of the rechargeable NiCad pack will be shortened. Welch Allyn recommends unplugging the battery pack power input cord from the back of the audiometer and plugging the main line power cord into the jack if main line power is to be used most of the time. -
Page 10: To Replace Nicad Batteries
2.4 TO REPLACE NiCad BATTERIES Please refer to Figures 2-2, 2-3, 2-4 and proceed as follows: a. Unplug the AM 232 Manual Audiometer from the line power (mains). b. Remove the two screws on the battery pack cover and lift off the cover. -
Page 11: Alkaline Battery Installation/Operation
To install the alkaline batteries, refer to Figures 2-2, 2-3, 2-4, and proceed as follows: a. Unplug the AM 232 Manual Audiometer from the line power (mains). b. Remove the two screws on the battery pack cover and lift off the cover. -
Page 12: Section 3 - Operation
Section 3 — Operation Throughout this section there are references to front panel (F) and rear panel (R) connectors, controls and indicators. Please refer to Section 1.3 and Figure 1-1 for specific descriptions and locations. 3.1 PRELIMINARY CHECK Prior to testing, ensure that the power cord and earphone cords are plugged in (R1 and R2 respectively). -
Page 13: Placement Of Earphones
3.5 AUDIOGRAM FORM The AM 232 Audiogram Form (see Figure 3-1) consists of three distinct parts: • Space for entering information about the person to be tested. -
Page 14: Routine Calibration Check
3.6 ROUTINE CALIBRATION CHECK The microprocessor-controlled circuitry and quality construction of the AM 232 Manual Audiometer will provide long and reliable service. It is good practice, however, to make and file, at the start of each month’s testing, the audiogram of a single subject or of a small group of subjects who are likely to be routinely available for this purpose. -
Page 15: Tone Type Selector (F9)
To enable the range extension feature, simply push the button labeled +10 dB. Note the appearance of the “+” sign on the LCD. To disable the feature, either push the button a second time, reduce the intensity (with the HL control knob) to 20 dB below the standard maximum HL, or change any other parameter (frequency knob, routing switch). -
Page 16: Threshold Determination (Pure Tone)
3.8.3 Threshold Determination (Pure Tone) a. The level of the first presentation shall be 10 dB below the level at which the subject responded during the familiarization procedure. Present the tone for a period of one or two seconds. Time between tones can be varied, but not shorter than the duration of the test tone itself. -
Page 17: Section 4 - Routine Maintenance
4.4 DISTORTION AND FREQUENCY SHIFT This check can be best made by listening to the output of the AM 232 Manual Audiometer through the earphones while presenting all 11 fre- quencies at a loud, but not uncomfortable, level (70 to 80 dB HL for normal ears). -
Page 18: Special Messages
When an error code consisting of an “E” and a two-digit number (xx = number) appears on the audiometer’s display, a system error has been detected. The AM 232 Manual Audiometer will enter a “lock-out” mode which will not permit the instrument to operate. The specific error code will remain on the display for several seconds, then the instrument will shut itself down completely. -
Page 19: Service And Warranty Information Service And Repair
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 manu- facturer’s specifications for a period of one year from the date of purchase. -
Page 20: Specifications
Specifications Standards The AM 232 meets ANSI S3.6 and IEC 645 Type 4 Audiometer Standards, and IEC 601-1, CSA C22.2 No. 601-1, and UL 544 electrical standards. Frequency Range Discrete Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000 Hz Accuracy: ±3%... - Page 21 AM 232 Manual Audiometer, AC Power (USA) 23205 AM 232 Manual Audiometer, AC Power (Export, specify country and voltage) 23210 AM 232 Manual Audiometer, AC Power and Battery (USA) 23215 AM 232 Manual Audiometer, AC Power and Battery (Export, specify country and voltage) Supplied Accessories...
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Page 22: Bibliography
51 Earphone Cushions,” J. Acoust. Soc. Am., 70(5), Nov. 1981, 1235-1238 Newby, H.A., Audiology (4th ed.), New Jersey: Prentice-Hall Inc. (1979) U.S. Department of Labor, Occupational Noise Exposure, CFR 1910.95, March 8, 1983 Welch Allyn, Inc. 4341 State Street Road P.O. Box 220, Skaneateles Falls, N.Y. 13153-0220 U.S.A.
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