Welch Allyn TM 262 Operating Instructions Manual
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Welch Allyn TM 262 Operating Instructions Manual

Welch Allyn TM 262 Operating Instructions Manual

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TM 262
TM 262
™
Auto Tymp
Operating Instruction Manual
April, 2008
Part Number 1738-0101 Rev 08

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  • Page 1 TM 262 TM 262 ™ Auto Tymp Operating Instruction Manual April, 2008 Part Number 1738-0101 Rev 08...
  • Page 3 Prefix Electromagnetic Compatibility (EMC) Electromagnetic compatibility (EMC) Please refer to the Electromagnetic Compatibility Reference Guide on CD (part number 482-6387xx) for EMC information concerning your system. Compatibilité électromagnétique (CEM) Veuillez vous reporter au guide de référence de compatibilité électromagnétique sur CD (numéro de pièce 482-6387xx) pour des informations sur la CEM relatives à...

  • Page 4: Service And Repair

    TM 262 Warranty Welch Allyn, Inc. warrants the TM 262 Auto Tymp, 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...

  • Page 5: Table Of Contents

    Table of Contents Electromagnetic Compatibility (EMC)..................a Warranty.............................b Service and Repair........................b Introduction 1 Introduction..........................1-3 Tympanometry and Gradient ....................1-5 Gradient ........................... 1-6 Screening acoustic reflex ......................1-7 Manual audiometry ........................1-8 Recycling / disposal ........................ 1-9 Glossary of terms ......................... 1-10 Installation 2 Unpacking and Inspection.....................
  • Page 6 TM 262 Obtaining a seal ........................3-8 Audiometry testing information ..................3-10 Instructing the patient/subject ....................3-10 Placement of earphones ......................3-10 Response handswitch (optional accessory)................3-10 Program Mode ........................3-11 Reflex format ..........................3-11 Print header format ........................ 3-12 Audiometric format during printing ..................3-13 Normal box format.........................
  • Page 7 Table of Contents RS-232 Interface 5 Introduction..........................5-3 Operation..........................5-3 Record Formats........................5-4 General record format ......................5-4 Tympanometry and Reflex test results record ................. 5-5 Audiometry test results record ....................5-9 Notes ............................5-9 Data Transmission Protocol ....................5-11 Data Transfer Program Mode .................... 5-12 RS-232 Interface ........................
  • Page 8 TM 262 Blank page. Revised 4/11/08...

  • Page 9: Introduction

    Introduction Chapter 1 Introduction Revised 4/11/08...
  • Page 10 TM 262 Blank page. Revised 4/11/08...
  • Page 11 Introduction Introduction The TM 262 Auto Tymp (hereafter referred to as ‘instrument’ in this guide unless otherwise noted for clarity) is a versatile combination instrument that provides testing capability for tympanometry alone, tympanometry combined with screening acoustic reflex measurements, and screening audiometry.
  • Page 12 Injury to personnel or damage to equipment can result when a three-prong to two-prong adapter is connected between the TM 262 power plug and an AC outlet or extension cord. Additionally, the TM 262 is equipped with a specific power transformer (8000-0246) and power cord, which should not be interchanged with any other transformer or supply and are for use only with the TM 262.

  • Page 13: Tympanometry And Gradient

    Introduction Tympanometry and Gradient Tympanometry is an objective technique used since the late 1960’s to measure the mobility compliance) and the pressure within the middle-ear system. During tympanometry, a low pitch tone (i.e., 226 Hz probe tone) is presented to the ear canal via the light-weight probe. The probe tone is used to measure the compliance changes within the middle-ear system while air pressure within the hermetically sealed ear canal is varied from a positive to a negative value.

  • Page 14: Gradient

    TM 262 The presence of a pathological condition which interferes with the mobility of the tympanic membrane, the ossicular chain, or the air pressure within the middle-ear space can be detected during tympanometry. For example: • If the air pressure within the middle-ear space becomes negative due to a blocked eustachian tube, tympanometry permits the measurement of this negative pressure and its effect on middle-ear compliance.

  • Page 15: Screening Acoustic Reflex

    Introduction Screening acoustic reflex An acoustic reflex occurs when a very loud sound (stimulus) is presented to the auditory pathway. During acoustic reflex testing, the stimulus is presented to the ear canal through a probe (ipsilateral). This stimulus then travels through the middle ear to the cochlea. From the cochlea, frequency and intensity information is transmitted via the 8th nerve to the brain stem where a determination is made as to whether or not the intensity of the stimulus is high enough to elicit the reflex response.

  • Page 16: Manual Audiometry

    TM 262 Manual audiometry While tympanometry and acoustic reflex measurements check the integrity of the middle-ear system, audiometry provides a means for checking the integrity of the entire auditory pathway. Manual audiometry provides a method to check an individual’s ability to hear a test signal at a particular intensity level or at the lowest possible intensity level without the use of masking.

  • Page 17: Recycling / Disposal

    To recycle or dispose of this product within the European Union, refer to Welch Allyn insert 704414 “Disposal of Non-Contaminated Electrical and Electronic Equipment.” Directive 2002/96/EC WEEE.

  • Page 18: Glossary Of Terms

    TM 262 Glossary of terms Tympanometry - an objective measurement of middle-ear mobility and middle-ear pressure through the use of a low frequency sound (probe tone) and air pressure changes. Tympanogram - the tracing which depicts the results of tympanometry.

  • Page 19: Installation

    Installation Chapter 2 Installation Revised 4/11/08...
  • Page 20 TM 262 Blank page. Revised 4/11/08...

  • Page 21: Unpacking And Inspection

    Check that all accessories listed in Table 1 (per version ordered) are received in good condition. If any accessories are missing or damaged, notify your Welch Allyn Distributor or the factory immediately. See the Specifications chapter of this manual for the catalog numbers of accessories and also for a listing of optional accessories.

  • Page 22: Probe Indicators

    TM 262 Probe Indicators Figure 1: Probe indicators P1 - Yellow: The probe is occluded. Remove the probe and inspect for cause of occlusion. P2 - Green lamp: Blinking - The instrument is ready to begin a Tymp. Steady green - test successfully started and in progress.

  • Page 23: Front Panel Controls And Indicators

    Installation Front Panel Controls and Indicators Figure 2: Front panel Fl Power on indicator and label: Indicator is illuminated when the instrument is receiving power. F2 Print Screen: Pushbutton used to print the currently displayed page of memory. F3 Print All Memory: Used to print all pages of data from memory. F4 Paper Advance: Causes paper to feed through printer;...
  • Page 24 TM 262 F13 Prog(ram): Selects Program mode screen which lists settings available for reflex presentation format, printout header format, audiogram vs. tabular format, display normal box, and identity frequency range for Audiometry mode. F14 Aud(iometry): Selects Audiometry mode.(Available in models with Audiometer only).

  • Page 25: Printer And Display

    Installation Printer and Display The display (Figure 3) indicates test mode, parameters for test and test results. Printer Display Figure 3: Printer and display Revised 4/11/08...
  • Page 26 TM 262 Figures 4 through 8 show the individual display format for each test mode. Figure 4: Display format for TYMP Only Test. Figure 5: Display Format for TYMP/REFLEX Test (Reflex test results given as Yes or No). Figure 6: Display for TYMP/REFLEX Test (Reflex test results given in dB HL).

  • Page 27: Rear And Bottom Panel Labels And Connectors

    Installation Rear and Bottom Panel Labels and Connectors Figure 9: Rear and bottom panel labels and connectors. R1: Company name, address, model, serial number and country of origin. R2: Symbol denotes a Type B, Class II product per IEC 878 as referenced in IEC 60601-1. R3: Symbol denotes Attention, consult accompanying documents.

  • Page 28: Initial Set-Up

    Note that the lamp (F1) on the front panel is illuminated indicating the instrument is receiving power. Once the power switch is activated, the TM 262 symbol will appear on the display along with a listing of the revision number for the Tymp/Reflex and Audiometry (if purchased) software.

  • Page 29: Paper Storage

    Installation Paper storage The instrument is supplied with a thermal printer. This type of printer requires a heat-sensitive paper to create an image. For maximum paper life, any spare rolls of paper should be stored as follows: Store in the dark, i.e., in a drawer or cabinet b.

  • Page 30: Pretest Tymp Checks

    For your convenience, a test cavity is provided with your instrument. This test cavity enables you to quickly verify, on a daily basis, the proper calibration of your unit. Welch Allyn strongly recommends that you make this quick check a part of your daily routine.

  • Page 31: Altitude Adjustment

    Installation with the 5.0cm opening on the test cavity. To keep a record of this test cavity calibration check, simply press the Print All button on the front panel of the instrument. Since sound pressure will vary with altitude and barometric pressure, some variation from the 0.5, 2.0 and 5.0 cm readings may be observed.
  • Page 32 TM 262 The altitude calibration mode can only be entered with the instrument is powered up from its Off state while the program mode (PROG) button is depressed. Hold the PROG button for approximately five seconds. When entering the altitude mode, the display will read as follows: Altitude Mode ECV 2.0...

  • Page 33: Pre-Test Audiometric Checks (Models With Audiometer Only)

    Also, Audiocups are available from Welch Allyn as an optional accessory. If the person being tested is in the same room as the audiometer, it is recommended that he/she be seated about three feet (1 meter) away from the instrument.

  • Page 34: Biological Check

    Keep a copy of your chart for a day-to-day reference in checking your instrument. If you purchased the TM 262 with Audiometry, select the Audiometry (AUD) mode pushbutton located in the center section of the front panel. Note that the display changes from the tympanogram format to an Audiogram format.

  • Page 35: Operation

    Operation Chapter 3 Operation Revised 4/11/08...
  • Page 36 TM 262 Blank page. Revised 4/11/08...

  • Page 37: Preventive Maintenance

    Preventive maintenance does not require access to the interior of the instrument and may be performed by the user. For the TM 262, preventive maintenance consists of periodically cleaning and inspecting the exterior of the instrument. It is recommended that you develop a schedule for these purposes.

  • Page 38: Probe Care

    TM 262 Probe care With use, cerumen can work its way up inside the probe nose cone (probe tip). During the warm-up period each day and throughout the day, inspect the probe tip to make sure it is clean and free of cerumen. If any cerumen is detected, refer to the following instructions for cleaning and maintaining the instrument’s probe.
  • Page 39 Operation The O-Ring There is an O-Ring seated at the end of the threads on the probe. As a preventative maintenance measure, and to ensure that the nose cone of the probe unscrews easily, do not clean or remove the lubricant from the O-Ring. If the O-Ring appears to be void of any lubricant, or if the nose cone itself was difficult to remove, apply a high-quality synthetic lubricant such as those considered “food-grade.”...
  • Page 40 TM 262 The probe wire Inside the probe body there is a metal tube that contains a wire required for cleaning purposes. Carefully remove this wire from the metal tube (Figure 3). This will pull any cerumen out of the metal tube.

  • Page 41: Earphone Care (Models With Audiometry Only)

    The number of tests per roll of paper will vary with the version Auto Tymp being used and the type of tests being performed. See Printer Description in the Specification chapter for approximations. Replacement paper can be purchased from your local Welch Allyn Distributor or from the factory.

  • Page 42: Tympanometry Testing Information

    TM 262 Tympanometry testing information As mentioned, it is a good idea to perform a test on a normal ear each day to make certain that your instrument is functioning properly. See Biological Check in Chapter 2 for details. Helpful hints Tympanometry and acoustic reflex testing can be performed at any age.
  • Page 43 Operation Slip the appropriate size eartip onto the nose cone of the probe, making sure the rounded tip of the eartip sits flush with the tip of the nose cone (Figure 4). Figure 4: Positioning the eartip Move any hair away from the ear and pull upward and back on the pinna of the ear on an adult (pull downward and back on the pinna of a young child.) This tends to straighten out the ear canal and ensure better results.

  • Page 44: Audiometry Testing Information

    TM 262 Audiometry testing information Prior to testing, ensure that the earphone cords are plugged into their appropriate connectors on the rear panel of the instrument. Select the desired tone type (i.e., pulsed, steady, or FM). CAUTION Always handle earphones with care. Neither drop them nor permit them to be squeezed together.

  • Page 45: Program Mode

    * Reflex HL + Curve * Print - Audiogram Reflex HL only Print - Aud Table Reflex Yes/No * Normal Box ASHA * Prn Header Welch Allyn Normal Box Off Prn Header Off * Aud Range Normal Prn Header Custom Aud Range Narrow Note that these selections fall into five different groups of controls: •...

  • Page 46: Print Header Format

    Select this option to design a custom header, which might be the name of your own facility, department or company name. Use a similar procedure to that described above to deselect the Welch Allyn header and select no header or a custom header.

  • Page 47: Audiometric Format During Printing

    Operation If you had previously entered a custom header: Position the square cursor next to the asterisk (‘) in front of Pm Header Custom. Press M+ to display the left-hand margin along the bottom of the display. The word SAVED will appear at the lower right margin indicating that the custom header is still selected.

  • Page 48: Normal Box Format

    TM 262 Normal box format It is possible to have the normal box, as described by ASHA, appear on the tympanogram screen and printout. The boundaries for this normal box are -150 daPa to +100 daPa and 0.2 cm to 1.4 cm NOTE: A compliance value of 1.5 cm...

  • Page 49: Tympanometry/Reflex Test Sequence

    Operation Tympanometry/Reflex Test Sequence a. Tympanometry only mode Select the Tymp only mode by pressing Tymp on the front panel. The display will immediately show the format for the tympanogram along with the summary information headers ECV, cm , daPa, and GR. The default scale for compliance is 1.5 cm .

  • Page 50: Tympanometry And Ipsilateral Reflex

    TM 262 When the tympanogram is completed and the test is finished, the steady green lamp turns off and the display displays the complete tympanogram results. It is now possible to remove the probe from the ear and to view the test results on the display.
  • Page 51 Operation After the compliance measurement is made and a response is detected, the highest intensity level is stored as the reflex test result and displayed on the screen. If no response is detectable at this third and highest intensity level, either a No or an NR (depending upon Program mode setting) is indicated on the screen next to the frequency tested label.

  • Page 52: Programming Ipsilateral Acoustic Reflex Test Frequencies

    TM 262 c. Programming ipsilateral acoustic reflex test frequencies As mentioned earlier, the instrument defaults to a 1000 Hz test stimulus when the TYMP REFLEX button is first pressed after receipt from the factory. However, any combination of the four available frequencies (500, 1000, 2000, 4000 Hz) can be selected either temporarily or as revised default parameters.

  • Page 53: Audiometry Test Sequence (Models With Audiometer Only)

    Operation Audiometry Test Sequence (Models with Audiometer only) To enter the audiometry mode: Press the AUD button. Note that the display changes from a tymp or tymp and reflex format to an audiogram format. The default settings for the frequencies available during audiometry are set in the Program mode as 125 through 8000 Hz (normal) or 500 through 6000 Hz (narrow).
  • Page 54 TM 262 To change the intensity level of the test tone: Rotate the dB HL knob in the clockwise direction to increase the intensity level in 5 dB steps; rotate the knob in the counterclockwise direction to decrease the intensity level in 5 dB steps.

  • Page 55: Screening Audiometry

    Operation Screening audiometry Carefully position the earphones over the individual’s ears so that the red phone covers the right ear and the blue phone covers the left ear. Be sure that nothing is obstructing each earphone such as earrings, eye glasses or a hearing aid.

  • Page 56: Exit Audiometry

    TM 262 If a response is indicated, decrease the intensity of this same test frequency by 10 dB and present the tone again for one to two seconds. b. If no response is indicated, increase the intensity by 5 dB. Present the tone again.

  • Page 57: Tests In Memory

    Audiometric test results are stored in memory when M+ is pressed. A total of eight memory locations are available with the TM 262. Each test result is assigned a memory location number in order of sequence obtained starting with Ml and continuing up to M8.

  • Page 58: Printing Test Results

    TM 262 Printing test results The printout will begin with a header if it is selected during the program mode (i.e., TM 262 or a custom header designed by you). The next two lines contain space for entering the individuals name and the test date.

  • Page 59: Test Results

    Test Results Chapter 4 Test Results Revised 4/11/08...
  • Page 60 TM 262 Blank page. Revised 4/11/08...

  • Page 61: Ear Canal Volume

    Test Results Ear Canal Volume Normal As a general rule, values for ear canal volume should be between 0.2 and 2.0 cm . However, the normal values will vary with age and bone structure. Abnormal An ear canal value of less than 0.2 cm indicates an abnormal condition.

  • Page 62: Pressure Peak

    TM 262 NOTE: If a compliance value is measured to be greater than 1.5 cm, the instrument changes the range assigned to the graph automatically and the tympanogram is traced to 3.0 cm. The validity of tympanometry and acoustic reflex testing is dependent upon a healthy tympanic membrane.

  • Page 63: Acoustic Reflex

    Test Results Acoustic reflex Normal For screening purposes, an ipsilateral reflex measured at any one of the three levels available per frequency can be considered normal. Obviously, the lowest values are desired. However, without knowing the hearing threshold level of the individual per frequency, it is difficult to make a more definite statement.

  • Page 64: Special Messages And Error Codes

    If the error code appears for the second time, make a note of it and contact your Welch Allyn Service Representative, giving him/her the exact error code number.
  • Page 65 Test Results Figure 6: Abnormal Tymp Figure 5: Abnormal Tymp Figure 7: Abnormal Tymp Figure 8: Abnormal Tymp Figure 9: Abnormal Tymp Figure 10: Abnormal Tymp Revised 4/11/08...
  • Page 66 TM 262 Blank page. Revised 4/11/08...

  • Page 67: Rs-232 Interface

    RS-232 Interface Chapter 5 RS-232 Interface Revised 4/11/08...
  • Page 68 TM 262 Blank page. Revised 4/11/08...

  • Page 69: Introduction

    RS-232 Interface Introduction The RS-232 Interface option provides the capability of transferring stored test results from the instrument to an external computer or data collection device via an optically isolated serial interface. WARNING Only equipment that meet the requirements of IEC 60601-1-1 rating may be connected to the Serial interface.

  • Page 70: Record Formats

    TM 262 Record Formats General record format All output records are transmitted in a predefined, fixed length format. The generic format for all records is: “.” Record Record Record Total Data Checksum “CR” “LF” Type Sequence Index Record Fields Number...

  • Page 71: Tympanometry And Reflex Test Results Record

    RS-232 Interface Tympanometry and Reflex test results record Character Number of Data Number Characters Type Field Name Field Description ASCII Start of record “.” ASCII Record Type “x” ASCII Record “0” to “9” Sequence Number ASCII Record Index “1” to “8” Number ASCII Total Record “1”...
  • Page 72 TM 262 Character Number of Data Number Characters Type Field Name Field Description sChar Slow Index The data index where the last compliance data point measured at 600 daPa/sec before the rate changes to 200 daPa/sec is stored. -1 = No rate change occurred...
  • Page 73 RS-232 Interface Character Number of Data Number Characters Type Field Name Field Description uChar Reflex #1 Results of Reflex test #1 Result Bits 1 & 0 = dB level tested: 00 = Low dB level 01 = Middle dB level 10 = High dB level 11 = Invalid Bits 3 &...
  • Page 74 TM 262 Character Number of Data Number Characters Type Field Name Field Description uint Reflex #1 Reflex recovery compliance data point #5 of Recovery [5] 6measured after the stimulus is turned off, in cc X 256,Bit 15 = Noise indicator0 = Quiet data measurement1 = Noisy data measurement, potentially unreliable.

  • Page 75: Audiometry Test Results Record

    RS-232 Interface Audiometry test results record Character Number of Number Characters Data Type Field Name Field Description ASCII Start of record “.” ASCII Record Type “y” ASCII Record Sequence Number “0” to “9” ASCII Record Index Number “1” to “8” ASCII Total Record Number “1”...
  • Page 76 TM 262 Example: Reflex #1 Reflex [0] = “0”, “3”, “0”, “D” = Ox3OD = 781 decimal scaled X 256 = 781 /256 = 3.051 cm Audiometry Threshold values are stored scaled by 2 in the sequence of 125 Hz, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000 and 8000 Hz.

  • Page 77: Data Transmission Protocol

    RS-232 Interface Data Transmission Protocol The RS-232 Interface uses a Auto Repeat Request (ARQ) communications protocol to ensure the reliable transfer of data. With this protocol. the instrument will transmit a data record and then wait for a response from the external device. If the external device receives the record cor- rectly, is should respond with an acknowledge “ACK”...

  • Page 78: Data Transfer Program Mode

    TM 262 Data Transfer Program Mode The Data Transfer Program mode is used to modify the RS-232 interface configuration parame- ters to match the computer’s RS-232 parameters. To enter the Data Transfer program mode, Enter the User Selections Program mode by selecting the PROGram pushbutton.

  • Page 79: Rs-232 Interface

    The configuration of the TM 262 RS-232 interface must be set to match the interface configura- tion of the computer. The TM 262 defaults to 9600 baud, no parity, 8 data bits, 2 stop bits and no communications flow control. The default settings for the baud rate, parity, number of data bits and flow control may be modified using the Data Transfer Program Mode explained earlier in this chapter.
  • Page 80 TM 262 Blank page. 5-14 Revised 4/11/08...

  • Page 81: Bibliography

    Bibliography Chapter 6 Bibliography American Speech-Language-Hearing Association (1990). “Guidelines for Screening for Hearing Impairment and Middle Ear Disorders”. ASHA, 32 (Suppl.2), 17-24. Criteria for Permissible Ambient Noise During Audiometric Testing (ANSI S3.1 - 1977). de Jonge, R.R. (1986). “Normal Tympanometric Gradient: A Comparison of Three Methods”. Audiology, 26, 299-308.
  • Page 82 TM 262 Blank page. Revised 4/11/08...

  • Page 83: Specifications

    Specifications Chapter 7 Specifications Revised 4/11/08...
  • Page 84 TM 262 Blank page. Revised 4/11/08...

  • Page 85: Tympanometry/Reflex Modes

    Specifications Specifications Standards: UL 60601-1 Medical Electrical Equipment Requirements for Safety IEC/EN 60601-1 General Requirements CSA C22.2 No.601-1-M90 ANSI S3.39-1987 Aural Acoustic Impedance Admittance (Type 3) IEC 1027-1991 Aural Acoustic Impedance/ Admittance (Type 3 ANSI S3.6-1989 Audiometers (Type 4) IEC 60645-1 Pure Tone Audiometers (Type 4) PTB Certificate No.

  • Page 86: Acoustic Reflex Stimuli

    TM 262 Rate of Sweep: 600 daPa/sec except near tympanogram peak where sweep rate slows to 200 dapa/sec to provide better definition of peak compliance. Direction of Sweep: Positive to negative Tymp Test Time: Approximately 1 second NOTE: High compliance tympanograms will take somewhat longer.

  • Page 87: Audiometry Mode

    Specifications Audiometry mode (Model No. 26230, No. 26230-RS, No. 26235, No. 26235-RS only - marked “Version 4”) Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000 Hz Accuracy: ±3% Total Harmonic Distortion: < 3% (125 to 3000 Hz measured acoustically at maximum dB HL;...

  • Page 88: Intensity Levels

    TM 262 Intensity Levels 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 NOTE: An additional +10 dB is available per frequency via the +10 dB pushbutton.

  • Page 89: Supplied Accessories

    Specifications Supplied accessories Probe (all versions) 1738-3200 TDH-39 Headset (model numbers 26230/26235 only) #23223 Test Cavity (all versions) #26241 Eartips, (Probe) 6 sizes, 2 each (all versions) #26100 Paper 5 rolls thermal 3" wide (all versions) #52601 qty: 5 Optional Accessories Carrying Case #05260 Dust Cover...

  • Page 90: Catalog Listing

    TM 262 Catalog Listing Tymp and Ipsi Reflex TM 262 Auto Tymp (USA) #26200 TM 262 Auto Tymp (Export, specify country and voltage) #26205 TM 262 Auto Tymp (Includes RS-232 Interface) (USA) #26200-RS TM 262 Auto Tymp (Includes RS-232 Interface)
  • Page 91 Index Gradient 1-5, 1-6, 4-4 Green lamp 2-12 Accessories supplied 2-3 Acoustic reflex 4-5 Altitude adjustment 2-13 Ambient noise 2-15 Helpful hints 3-8 Audiogram range 3-14 Audiometric Checks (Models with Audiometer only) 2-15 Indicators 2-5 Audiometric format during printing 3-13 Initial set-up 2-10 Audiometry 4-5 Inspection 2-3...
  • Page 92 Service and Repair 1-b Special Messages 4-6 Specifications 7-1 Tests in memory 3-23 Threshold audiometry 3-21 TM 262 1-3 Transferring during normal operation 5-3 Transferring from memory pages 5-3 Tympanometry and Gradient 1-5 Tympanometry and Reflex test results record 5-5...

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