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MIDIMATE 602 & 622 Diagnostic Audiometers

If the patient can still hear the tone, this is the valid threshold. If the patient cannot

hear the tone, this is because the threshold determined without masking has been

invalidated by contralateral bone conduction to the better ear. How to obtain the

valid threshold is described in §4.1.4.

4.1.4

Correcting a threshold invalidated by contralateral bone conduction

In cases where the tone threshold determined for the poorer ear has been invalidated

by contralateral bone conduction, do as follows:

Press

Softkey 3

to display the

Options Menu

Toggle

Softkey 2

1 dB/5 dB

, to change the level resolution for both hearing

level and masking to

5 dB

Increase the hearing level of the tone in 5 dB steps and present the tone. Do so

until the patient can hear it.

Increase the masking level by 5 dB and repeat step 2.

Repeat step 3 until an increase in masking level does not change the tone thresh-

old.

The tone threshold determined under these conditions is the correct one.

4.1.5

Locking the masking level to the hearing level

You can lock the masking level to the hearing level so that any change in the hearing

level results in a corresponding change in the masking level. Do as follows:

In test mode press

Softkey 3

to display the

Options Menu

Toggle

Softkey 4

to activate hearing level lock. If the display shows

HLL-On

, the

hearing level lock will be activated when you press

Softkey 4

To change the interval between the Masking and Hearing levels, turn the

Mask-

ing

wheel.

4.1.6

Testing above 110 dB HL

To override the MIDIMATE 602/622 110 dB (approx.) hearing level limit, which is

built in for safety purposes, toggle the

Ext. Range HL

key so that the

Ext. Range HL

lamp lights up. You can then test patients at maximum hearing levels up to 25 dB

greater, depending on the transducer in use.

4.1.7

Setting a minimum tone presentation time

Press

Softkey 3

to display the

Options Menu

, and then

Softkey 1

1.5s On/Off

to enable or disable an automatic timer which sustains the effect of pressing the

Tone

Switch

for a minimum of 1.5 s.

Содержание Madsen Midimate 602

Страница 1: ...602 622 Diagnostic Audiometers Quick Guide Doc no 7 50 0070 01 Part no 7 50 00700 0459 ...

Страница 2: ...t 2011 GN Otometrics A S Printed in Denmark by GN Otometrics A S Denmark All information illustrations and specifications in this manual are based on the latest product information available at the time of publication GN Otometrics A S reserves the right to make changes at any time with out notice Version release date 15 September 2011 Technical support Please contact your supplier GN Otometrics A...

Страница 3: ...ting above 110 dB HL 13 4 1 7 Setting a minimum tone presentation time 13 4 2 Bone Conduction thresholds 14 4 2 1 Masking with TDH39 headphones 14 4 2 2 When to use a masking insert phone 14 4 3 Free Field thresholds 15 5 Testing with Speech 16 5 1 Live speech testing 16 5 1 1 Setting up the test 16 5 1 2 Testing the speech reception threshold 16 5 1 3 Testing speech discrimination 17 5 2 Testing ...

Страница 4: ...MIDIMATE 602 622 Diagnostic Audiometers 4 ...

Страница 5: ...nt including electrical business equipment Service and repair Service and repair of electromedical equipment should be carried out only by the equipment manufacturer or by authorized representatives The manufacturer reserves the right to disclaim all responsibility for the operating safety reliability and performance of equipment serviced or repaired by other parties Cleaning and disposal Periodic...

Страница 6: ...t panel controls are shown in the Courier font The following abbreviations are used in the MIDIMATE 602 622 display ABLB Alternate Binaural Loudness Balance Bin S M Binaural Stimulus plus Masking C Continuous Ext External Tape 1 Tape 2 F F Free Field HLL Hearing Level Lock L Left NBN Narrow Band Noise P Pulsing PTS Patient Signal R Right SISI A Short Increment Sensitivity Index Air SN Speech Noise...

Страница 7: ...witch Phone L Left blue R Right red Calibrated for use with the TDH 39 head phones supplied as standard with the MIDIMATE 602 622 fitted on an ME 70 noise excluding Headset or on a TC 89E Headband Bone For the B 71 Bone Conductor 4 2 Warning Do not remove or tamper with the bone conductor cable while it is connected to the MIDIMATE 602 622 Either disconnect the cable from the Rear Panel or switch ...

Страница 8: ...ing Do not change the voltage selection while the power is connected Caution Always use an electrical power supply with protective earth which complies with IEC requirements such as a the power cable supplied b an electrical power supply tested to IEC requirements c a power cable fitted with a 3 pin plug d an extension cable with earth connection and e an extension cable which does not increase th...

Страница 9: ...To set up the test parameters manually do as follows To backstep in this procedure press Menu instead of a Softkey 1 Press Menu to display the Select Function screen The upper line shows the current function and the lower line shows the options you can select by pressing the Softkeys 2 Press Softkey 1 2 or 3 to select the Function Tone Speech or Special with its corresponding Output screen 3 Press...

Страница 10: ...pressed press Softkey 3 to display the Options Menu and toggle Softkey 1 un til 1 5s On is displayed Wait 5 sec or press Menu to return to test mode 9 To change the level resolution press Softkey 3 to display the Options Menu and toggle Softkey 1 until 1 dB or 5 dB is displayed Wait 5 sec or press Menu to return to test mode ...

Страница 11: ...fter a few moments 5 Check the monitored level of audible response from the patient response hand switch if it is enabled and if necessary use a screwdriver to adjust the Pt Vol level on the rear panel until this level is comfortable 4 1 2 Testing the patient To test the patient do as follows 1 Place the patient facing away from the MIDIMATE 602 622 preferably in a sound cabin 2 Instruct the patie...

Страница 12: ...o change the stimulus intensity until the patient s threshold is found for the current frequency displayed above Softkey 1 and read its value from the display above Softkey 3 13 If Store is set up press Softkey 3 twice to store this value MIDIMATE 622 only 14 Repeat the test at the next frequency Testing is usually done at increasing fre quencies until the highest frequency is reached and then to ...

Страница 13: ...esh old The tone threshold determined under these conditions is the correct one 4 1 5 Locking the masking level to the hearing level You can lock the masking level to the hearing level so that any change in the hearing level results in a corresponding change in the masking level Do as follows 1 In test mode press Softkey 3 to display the Options Menu 2 Toggle Softkey 4 to activate hearing level lo...

Страница 14: ...e threshold and check with the patient to find the most sensitive part of the mastoid to place the Bone Conduc tor Make sure that there is no contact between the headband which secures the Bone Conductor and the headset or headband supporting the TDH39 head phones which could conduct vibrations from one to the other Leave it in this po sition until the test is finished 8 Determine the threshold wi...

Страница 15: ...2 Connect the loudspeakers to the amplifier s outputs 3 Press Menu to display the Select Function menu 4 From the Select Function menu press Softkey 1 to select the Tone Out put menu 5 From the Tone Output menu press Softkey 3 to select F F 6 From the Tone F F Side menu press Softkey 1 to select Left 7 From the Tone F F Left Masking menu press Softkey 3 to select FF To minimize the influence of st...

Страница 16: ...ect Micr and display the Masking Output Input menu 8 Press Softkey 1 to select No Mask unless there is a risk of a response from the ear not being tested This may be the case either because of widely differing thresh olds or because the test is to be made at a level well above threshold For mask ing press Softkey 2 to use white noise WN or Softkey 3 to use speech noise SN which is white noise filt...

Страница 17: ...tion To test a patient s speech discrimination do as follows 1 Prepare for the test as described in 5 1 1 Each of the words used for discrimina tion testing must be phonetically balanced Because of the relatively high levels used in discrimination testing masking is usually recommended to prevent an unwanted response from the ear not being tested 2 Record the score of correctly repeated words for ...

Страница 18: ...corded speech are similar to those described in 5 1 2 and 5 1 3 5 3 Testing with Free Field speech For Free field speech testing use loudspeakers such as 8 02 450 and a two channel power amplifier such as PA 210 8 02 240 instead of headphones to present the speech to the patient The measured thresholds will be influenced by The distance from the loudspeakers to the patient The acoustic absorption ...

Страница 19: ...To do so turn any of the rotary wheels while you hold down the Tape 2 key on the front panel until a deflection of 0 dB is shown on the Stimulus VU indicator 9 When you have completed testing of the left ear toggle L R Shift to switch the signals to the left and right loudspeakers before you test the right ear ...

Страница 20: ...he electric power supply 3 Place the patient facing away from the MIDIMATE 602 622 in a sound cabin if available 4 Press Menu once or twice to display the Select Function menu 5 Press Softkey 3 Special 6 Select SISI A L from the Select special Test menu by pressing Soft key 1 7 Select Left by pressing Softkey 1 or Right by pressing Softkey 2 8 Instruct the patient to activate the patient response ...

Страница 21: ...ce when the test is repeated at different hearing levels To perform the test do as follows 1 Prepare for testing as in steps 1 to 4 of 6 1 2 Select Fowler from the Select special Test menu by pressing Softkey 2 3 Select the level for the test ear and present the tone to each of the patient s ears in turn twice for each ear Adjust the level until the patient feels the same sensation of loudness in ...

Страница 22: ...ing the Tone Switch 7 A response from the patient indicates a negative Stenger result the ear is im paired 8 If the patient does not respond because he wrongly believes that the tone was presented only to the allegedly impaired ear a positive Stenger result is obtained the ear is not impaired 9 Exit the test by pressing Menu 6 4 The Rainville test The Rainville test is used to determine the ipsila...

Страница 23: ... If required toggle Softkey 2 from C P W to C P W to select a pulsed tone stimulus 11 Turn the Hearing Level wheel to select an R Tone level about 5 dB above threshold 12 Press the Tone Switch to apply the tone stimulus in the headphone 13 Gradually increase the level of NBN in the Bone Conductor by turning the Mask ing Level wheel until the patient no longer responds when the stimulus is ap plied...

Страница 24: ...am or change a user test do as follows 1 Activate user test programming as described in 7 1 2 Press Menu once or twice to quit User Test 1 and display the Select Function menu or select an existing User Test to be changed 3 Set up or change the selected User Test as for manual setup by menu 3 2 4 To check that user test programming actually is activated or to save the current user test press Softk...

Страница 25: ...ou can enter spaces and dashes as well as the nu merals 0 to 9 6 Press Menu to exit the patient ID function 8 2 Printing audiograms MIDIMATE 622 only You can store air and bone conduction and free field threshold data for both ears and print it out on a standard printer a ZODIAC 901 or an external printer connected to the ZODIAC 901 as described in 2 1 1 To set it up see the description in 8 3 8 2...

Страница 26: ...the same audiogram if there is one To obtain separate audiograms do as follows 1 Test the patient with the first transducer type to be used 2 Print out the stored thresholds that were registered 3 Clear the stored data by pressing Softkey 5 Clr All in the Printer Menu 4 Test the patient with the second transducer type 5 Print out the stored thresholds that were registered with the second transduce...

Страница 27: ...order Press Softkey 3 to format printout for 110mm paper 9 Press Softkey 3 Header to display the Header menu 10 Press Softkey 1 Yes to include a header on each printout containing patient data and the time and date To skip this and speed up printout press Softkey 2 No 11 Press Softkey 4 Ths Log to display the Threshold Logging menu 12 Press Softkey 1 Yes to print out each threshold in a tabular fo...

Страница 28: ...MIDIMATE 602 622 Diagnostic Audiometers 28 ...

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