Welch Allyn TM 262 Page 1 Service Manual Download

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Operating

Instructions

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I 1000 Hz

0.1

cm3

I 2000 Hz

0.1

cm3

0 0.7 sec

ECV 1.4 cm3 PEAK 0.0 cm3 H

OP 70 daPa 0 daPa

-400 daPa 0 +200

[

Audio Menu

Service Manual

Summary of Contents for TM 262

Page 1: ...Operating Instructions I 1000 Hz 95 HL 0 1 cm3 I 2000 Hz 95 HL 0 1 cm3 0 0 7 sec ECV 1 4 cm3 PEAK 0 0 cm3 H OP 70 daPa 0 daPa 400 daPa 0 200 Audio Menu Service Manual...

Page 2: ...t Audiometric Checks Models with Audiometer Only 16 2 8 1 Noise Recovery Period 16 2 8 2 Elimination of Ambient Noise 16 2 9 Biological Check 17 Section 3 Operation 3 1 Eartip Care 18 3 2 Probe Care 1...

Page 3: ...ts 4 1 Ear Canal Volume 39 4 2 Compliance Peak 39 4 3 Pressure Peak 40 4 4 Gradient 40 4 5 Acoustic Reflex 41 4 6 Audiometry 42 4 7 Special Messages and Error Codes 42 4 8 Sample Test Results 42 Secti...

Page 4: ...the probe The probe tone is used to measure the compliance admittance changes within the middle ear system while air pressure within the hermetically sealed ear canal is changed from positive to negat...

Page 5: ...ability of the ossicular chain to conduct sound to the cochlea If small air pockets exist within the fluid the tympanogram will in dicate the negative pressure where the restricted mobility occurs Wi...

Page 6: ...e a bilateral response occurs i e the right and left 7th nerves innervate their respective middle ear muscles stapedial mus cles causing them to contract As these muscles contract they stiffen their r...

Page 7: ...sting 1 4 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 audito...

Page 8: ...n Manual Eartips 6 sizes 2 each Test Headset Models with audiometer only Paper 3 rolls NOTE Keep the original packing material and shipping container so the instrument can be well packaged if it needs...

Page 9: ...s FM appear on the display F6 Steady Tone Used during Audiometry mode to select a continuous test tone When present bar is depressed the steady symbol appears on the display F7 Pulsed Tone Used during...

Page 10: ...available in models with audiometer only F15 TYMP Press to select Tympanometry only mode F16 TYMP REFLEX Press to select Tympanometry and Reflex mode F17 RIGHT Used to identify right ear under test so...

Page 11: ...R COVER LOCATION 2 4 1 Liquid Crystal Display LCD The display indicates test mode parameters for test and test results Figures 2 4 through 2 8 show the individual display format for each test mode I 1...

Page 12: ...FIGURE 2 6 Display format for Reflex test results reported in dB HL FIGURE 2 7 Display format for Reflex test results reported in dB HL and also shown with a tracing Selected intensity level Selected...

Page 13: ...a service adjustment part that is intended for service personnel use only R5 Connector for handswitch Input impedance 47 K ohms pulls up to 5 volts R6 Contra Insert Phone Function not available R7 Con...

Page 14: ...usion and reposition the power switch to ON If both green and yellow lamps are still illuminated and you are certain that the probe is not occluded contact the Welch Allyn Technical Service Department...

Page 15: ...paper so that a section of paper is long enough to pass through the printer cover once it is repositioned over the printer 2 6 2 Paper Storage The TM 262 TM Auto Tymp TM utilizes a thermal printer whi...

Page 16: ...check the probe must be held carefully and without movement Do not place the probe on the same counter as the instrument or any moving object during this check as mechanical noise will be picked up by...

Page 17: ...2 Altitude Adjustment Since sound pressure will vary with altitude and barometric pressure some variation from the 0 5 2 0 and 5 0 cm3 readings may be observed Your TM 262 is carefully calibrated at o...

Page 18: ...table for accuracy STEP 3 If the measured volume is not within the published table value 0 1cc then the operator should exit the altitude mode by pressing the PROGRAM button and contact field service...

Page 19: ...e reaches objectionable levels i e sufficient to cause apparent hearing loss at the low frequencies Also earphone sound enclosures are available from Welch Allyn as an optional accessory If the person...

Page 20: ...o select each frequency and the dB HL knob allows you to alter the intensity of each frequency Position the test headset on your head so that each earphone is covering the ap propriate ear i e red is...

Page 21: ...refer to the following instructions for clean ing and maintaining the TM 262 TM Auto Tymp TM probe 3 2 1 Probe Nose Cone Cleaning FIGURE 3 1 Probe Nose Cone Removal Refer to Figure 3 1 and remove the...

Page 22: ...self was difficult to remove apply the lubricant provided with the instrument refer to Figure 3 2 FIGURE 3 2 O Ring Care 1 Place a small drop of lubricant at the front outer surface of the O Ring 2 Us...

Page 23: ...ny air leaks 3 3 EARPHONE CARE Models with Audiometer Only The earphone and cords provided with the TM 262TM Auto TympTM should last a long time with proper care To clean the earphones and cords use o...

Page 24: ...aced for any reason the TM 262 will need to be recalibrated Repeat this same sequence with the left earphone FIGURE 3 4 Earphone and Cord Care 3 4 PAPER SUPPLY To streamline each testing session check...

Page 25: ...arent hold an infant during testing will also help The key to success in all cases is to make sure that you are at eye level with the ear canal Keep your hand steady and your eyes on the ear canal and...

Page 26: ...sequence Make sure that the green lamp on the probe is blinking Position the probe up against the entrance of the ear canal applying a gentle pres sure to maintain a tight seal see figure 3 6 Watch th...

Page 27: ...ezed together Severe mechanical shock may change their operating characteristics and require their replacement Insert the earphone cords between the earphone cushions during storage to prevent damage...

Page 28: ...be sure that the handswitch connector is properly inserted into the jack on the rear panel The TM 262 TM Auto Tymp TM will display an appropriate symbol whenever the handswitch is operated 3 7 PROGRA...

Page 29: ...o the setting that you wish to select for your own default criterion When the square cursor is positioned in front of your desired setting press the SAVE button Note that the word SAVED appears in the...

Page 30: ...he knob in a counter clockwise direction The available character set is A Z 0 9 and a blank space The blank space can be used to erase an unwanted letter or number A total of 35 character spaces are a...

Page 31: ...the asterisk in front of Prn Header Custom press SAVE to cause the line cursor to appear at the left hand margin along the bottom of the display The word SAVED will appear at the lower right margin in...

Page 32: ...t results from the LEFT ear will follow below the right ear results NOTE This setting PRINT AUD selects the format for the printout only An audio gram always appears on the screen while in this mode 3...

Page 33: ...ric testing Note that the word SAVED will appear in the lower right hand margin and the asterisk now appears in front of the narrow range selection If the narrow range is selected the Hz and Hz button...

Page 34: ...is achieved the TM 262 TM Auto Tymp TM makes a measurement of Ear Canal Volume ECV This information is valuable since it indicates if a good seal has been established and it helps differentiate betwee...

Page 35: ...of the test as follows The pressure from the tympanogram peak compliance is re established within the ear canal and is offset by 20 daPa to avoid problems with extremely sharp tympanogram slopes With...

Page 36: ...blem for both the operator and the individual being tested 3 9 1 Programming Ipsilateral Acoustic Reflex Test Frequencies The TM 262 TM Auto Tymp TM default is a 1000 Hz test stimulus How ever any com...

Page 37: ...t is necessary to select the LEFT button upon entering the audiometry mode To change frequencies select the Hz button to advance to higher frequencies or the Hz button to advance to lower frequencies...

Page 38: ...quency press the SAVE button Note that the appropriate symbol O for right ear and X for left ear is positioned at the correct location on the audiogram If no re sponse was detectable over the intensit...

Page 39: ...old measurement If a second response does not occur repeat this step Practice is preliminary to threshold measurement determination and is to be completed at each new frequency setting 5 The level of...

Page 40: ...ner Upon exiting the erase mode the stored memories re shuffle and replace the empty memory with the remaining tests in the order in which they were run To exit the erase mode press the PRINT ALL or E...

Page 41: ...c pair of tests will not be combined if they are separated in the memory by a tympanometry test Therefore when tests are erased the resorting could cause a change in the Left Right sequence with audio...

Page 42: ...to determine if there is a perforation of the tympanic mem brane If there is a perforation due to trauma or due to the presence of a pressure equalization P E tube the measured ear canal volume will b...

Page 43: ...ane A pathological condition at this membrane can mask the true condition of the middle ear 4 3 PRESSURE PEAK NORMAL Strict rules for middle ear pressure indicate a normal range of 50 daPa However for...

Page 44: ...requency can be considered normal Obviously the lowest values are desired However without knowing the hear ing threshold level of the individual for that frequency it is difficult to make a more defin...

Page 45: ...ory of the individual must also be considered 4 7 SPECIAL MESSAGES AND ERROR CODES Special messages and error code numbers may be displayed on the screen or on the printout Special messages appear to...

Page 46: ...ressure No Gradient No Reflex POSSIBLE CAUSE Fluid filled middle ear Serous Otitis Compliance peak may be present at a more negative pressure than 400 daPa Abnormal Ear Canal Volume No Mobility No Mid...

Page 47: ...Borderline or Wide Gradient Slightly Elevated Reflex POSSIBLE CAUSE Glue Ear Otosclerosis Severely scarred tympanic membrane Plaque over tympanic membrane Normal Ear Canal Volume Hyperflaccid Middle E...

Page 48: ...Ear Mobility Slightly Negative Middle Ear Pressure Normal Gradient Normal to Slightly Elevated Reflex POSSIBLE CAUSE Partially blocked eustachian tube Normal Ear Canal Volume Normal Middle Ear Pressu...

Page 49: ...t results which have been erased will not be transferred TRANSFERRING FROM MEMORY PAGES If the PAGE button is used to review individual test results stored in any of the eight memory locations the DAT...

Page 50: ...dicates the record number within a group of records when all test results are transmitted For example this value will identify a record as Record 1 of 5 or Record 7 of 8 when used in conjunction with...

Page 51: ...ts stored in daPa Range 1 to 600 daPa 1 No gradient has been cal culated yet 0 No gradient could be calculated 29 2 sChar End Index The data index where the last compliance data point is stored Range...

Page 52: ...l 01 Middle dB level 10 High dB level 11 Invalid Bits 3 2 Reflex tests status 00 NT Not tested 01 YES Yes a reflex was detected 10 NR No reflex detected 11 NT_CAL Not tested due to a calibration data...

Page 53: ...he recovery points 5 and 6 are only included when the recovery is slow and there was no recovery according to the first four recovery data points If not included their values will be 0 267 asst Reflex...

Page 54: ...1 uChar sChar designate unsigned and signed characters respectively single bytes represented in Hexadecimal by two ASCII characters Example 0xE9 is sent as E 9 2 ulnt and slnt designated unsigned and...

Page 55: ...ff and stored as the relative compliance change from the Baseline Average value 5 4 DATA TRANSMISSION PROTOCOL The TM 262 RS 232 Interface uses an Auto Repeat Request ARQ communications protocol to in...

Page 56: ...ears the first time the Data Transfer Program mode is entered showing the default settings set at the factory Program Mode Data Transfer 19 2 kBAUD NO PARITY 8 BIT DATA 9600 BAUD ODD PARITY 7 BIT DATA...

Page 57: ...Computer 25 Pin 25 Pin 25 Pin 9 Pin TD 2 2 TD TD 2 2 TD RD 3 3 RD RD 3 3 RD SIGNAL 7 7 SIGNAL SIGNAL 7 5 SIGNAL GROUND GROUND GROUND GROUND 5 6 3 Communications Flow Control Software XON XOFF flow co...

Page 58: ...ar from the date of purchase If this instrument or any component thereof is found to be defective or at variance from the manufacturer s specifications during the warranty period Welch Allyn will repa...

Page 59: ...mpliance Range 0 to 1 5 cm3 0 to 3 0 cm3 NOTE 1 The range is automatically selected based upon the amplitude of the compensated tymp only tympanogram 2 The maximum uncompensated ECV tympanogram peak a...

Page 60: ...4000 Hz 80 90 100 dB HL 1000 and 2000 Hz 85 95 105 dB HL NOTE 1 Ipsi stimuli are time multiplexed with probe tone 106 msec ON 53 msec OFF 2 Stimuli are presented at lowest level first If there is no r...

Page 61: ...al to Noise Ratio 70 dB in 1 3 octave less than 10 dB HL for levels less than 60 dB HL Rise Fall Time 20 to 50 msec Tone Format tone is normally off until present bar is depressed Continuous steady wh...

Page 62: ...970 mA ENVIRONMENTAL Temperature Operating 60 F to 105 F Storage 40 F to 140 F 15 C to 40 C 40 C to 60 C NOTE Warm up time is required if storage temperature is different from room temperature Humidit...

Page 63: ...tch 23220 RS 232 Cable Adaptor 26244 DB 25 M DB 09 F RS 232 Cable 26243 10 DB 25 M F straight through CATALOG LISTING TM 262 Auto Tymp with Ipsi Reflex 26200 26200 RS North America TM 262 Auto Tymp wi...

Page 64: ...Threshold Audiometry a hearing test performed with a variety of fre quencies and intensities without the use of mask ing to determine if an individual can hear Normal Box range of pressure peak and c...

Page 65: ...stics of Supra Aural Audiometric Headsets using the Models MX41 AR and 51 Earphone Cushions J Acoust Soc Am 70 5 Nov 1235 1238 Newby H A AUDIOLOGY 4th Ed 1979 New Jersey Prentice Hall Inc Paradise J L...

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Page 68: ...Printed in U S A Part No 1738 0101 Welch Allyn Inc 4341 State Street Road P O Box 220 Skaneateles Falls N Y 13153 0220 U S A Tel 800 535 6663 in U S A only or 315 685 4560 Fax 315 685 3361...

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Welch Allyn TM 262, Service Manual

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