MA 790 Operating Instructions Rev E June 2004

Operating Instructions MA 790 Table of Contents Warranty...1 1.0

Specifications...2

2.0

Introduction ...3

3.0

Inspection and Set Up ...4 3.1 External Inspection...4 3.2 Unpacking ...4 3.3 Standard Accessories ...4 3.4 Optional Accessories ...5 3.5 Sound Room Installation ...5

4.0

Keyboard Function Guide ...6

5.0

Operation and Setup...8 Main Menu...8 Audiometer ...8 5.2.1 Audiometer Subject Information Data Entry ...8 5.2.2 Audiometer Test Menu ...9 5.3 Setup Menu...10 5.3.1 Printout Menus...11 5.3.2 Date/Time Menu...13 5.3.3 Misc. Menu ...14 5.3.4 Test Procedure Menus ...14 5.3.5 Data Transfer...16 5.4 Daily Calibration Menu...17

5.1 5.2

6.0

Test Procedures ...18 6.1 Environment ...18 6.2 Pre-test Preparation ...18

7.0 7.1 7.2 7.3

Automatic Testing ...19 Test Procedure ...19 Simplified Automatic Test Summary ...20 Test Result Codes...21

8.1 8.2 8.3

Manual Testing...22 Test Procedure ...22 Simplified Manual Test Summary...23 Test Printout Example ...24

9.1 9.2 9.3

Printer ...25 Operation ...25 Paper Installation ...25 Paper Specification...25

8.0

9.0

i

Operating Instructions MA 790 10.0

Care and Maintenance ...26

11.0 MA 790 RS-232 Computer Interface Information ...27 11.1 RS-232 Configuration and Operation ...27 11.2 Interface Configuration ...27 11.3 MA 790 Data Output ...28

ii

Operating Instructions MA 790 WARRANTY This warranty is extended to the original purchaser of the MA 790 Audiometer by Maico, through the authorized distributor from whom it was purchased, and covers defects in material and workmanship for a period of one year from date of delivery of the audiometer to the original purchaser. If the MA 790 audiometer contains a defect in material or workmanship Maico, at its option, will repair or replace the instrument at no charge except for transportation to and from the point of service. It is the purchaser’s responsibility to return the audiometer to the Maico Special Instrument Distributor from whom it was purchased or directly to Maico after receiving authorization to return. This warranty does not cover accessory cords and breakage or failure occasioned by tampering, misuse, carelessness, accident or modification. The warranty is void if the MA 790 audiometer is repaired by other than an authorized Maico Special Instrument service center.

NOTE: Specifications in this manual were in effect at the time of printing. Maico, whose policy is one of continuing progress, reserves the right to discontinue or change specifications or design at any time without notice or incurring obligation.

WARNING: The Maico MA 790 is designed to be used with a hospital grade outlet. Injury to personnel or damage to equipment can result when a three-prong to two-prong adapter is connected between the power plug and an AC outlet or extension cord.

1

Operating Instructions MA 790 1.0 SPECIFICATIONS AUDIOMETRIC Test frequencies: Attenuator range: Attenuator linearity: Stimulus: Rise/Fall time: Distortion: Right/left crosstalk: Stimulus on/off ratio:

500, 1000, 2000 3000, 4000, 6000, 8000 Hz ± 2% 0-95 dBHL ± 3 dB, 5 dB steps ± .5 dB/step Pulsed, 2.5 pulses/second or continuous 35 msec. typical .5% typical, 3% maximum -100 dB minimum 100 dB or -10HL, whichever is lower

PRINTER Print time: Chart dimensions:

Approximately 25 seconds 2.5” (6.35 cm) wide by 5.7” (14.5 cm) or longer, thermal sensitive paper.

3M type 1900 or equivalent, 3.0” (7.62 cm) maximum diameter roll. Printout, Labeled space for: subject, job no., noise exposure, hearing protectors, birth date and examiner. Printed data for I.D. number, date, test code comments, audiogram results, model and serial number, calibration date, and calibration specifications.

CONTROLS Front panel: Rear panel:

+5 dB, Stimulus, -10 dB, Left, Right, Save, Enter, Menu, Start, Stop, Print and Data Entry/Frequency keys Power switch

MECHANICAL Dimensions: Weight: Case:

14.5” (37.5 cm) wide by 4” (10.2 cm) high by 13” (33 cm) deep. 10 pounds (4.5 kg) with standard accessories Durable ABS housing

ELECTRICAL Voltage: Power Consumption: Operating temperature: Storage temperature: Test headset:

117 or 234 VAC ± 10%, 50-60 Hz externally selectable 30 watts 60°-100°F (15° to 38° C) 0°-120°F (-18° to 49° C) TDH-39 earphones

2

Operating Instructions MA 790 2.0 INTRODUCTION Your Maico MA 790 Automatic Audiometer provides the latest in hearing evaluation technology. It is easy to use, reliable and provides accurate testing in a fast, cost-effective manner. It is flexible, so that it can be programmed to fit the needs of your particular testing program. A microprocessor in the MA 790 automatically presents a pure tone stimulus in discrete 5 dB steps, at random intervals of 2 to 4 seconds. The stimulus consists of three tone pulses, or beeps, when the stimulus button is pressed. The hearing level ranges from 0-95 dB, and the frequency ranges from 500 Hz to 8000 Hz. The subject responds by pushing a hand-held switch each time the stimulus is heard. The program used is the familiar “down 10, up 5” sequence normally employed in manual pure tone audiometry. Test repeatability is established by the MA 790 at the beginning of each test to minimize unproductive test time. If the subject responds inappropriately before repeatability has been established by the instrument, the test will be terminated, a signal will sound and “Invalid Retest” will appear in the display. If, after repeatability has been established, the subject fails to establish a threshold at a given level, the audiometer will skip that frequency, and retest it one more time after completion of the normal test procedure. When the automatic test procedure has been completed a signal will sound to alert the operator that the test is finished, and the test results will be printed. The MA 790 will detect the following inappropriate responses: MR - Multiple Responses to a pure tone stimulus presentation NR - No Response, failure to respond at 95 dBHL SE - Subject Error, failure to establish a threshold within 17 stimulus presentations The MA 790 also has the capacity to complete a variety of hearing loss calculations, including AAO-1979. Important subject information, such as noise exposure level and type of ear protector used can become a part of each subject’s audiogram.

3

Operating Instructions MA 790 3.0 INSPECTION AND SET-UP 3.1

External Inspection

Your MA 790 was carefully inspected and packaged for shipping, however, it is a good practice to thoroughly inspect the outside of the shipping container for signs of damage. If any damage is noted after unpacking, notify your carrier immediately. 3.2

Unpacking

Once the MA 790 and accessories have been carefully removed from the carton, inspect the case for damage. Notify the carrier immediately if any mechanical damage is noted. This will assure that a proper claim can be made. Save all packing material so the claim adjuster can inspect it as well. Notify your Special Instrument Distributor where this instrument was purchased as soon as the adjuster has completed the inspection. SAVE ALL THE ORIGINAL PACKING MATERIAL AND THE SHIPPING CONTAINER SO THE INSTRUMENT CAN BE WELL-PACKAGED IF IT NEEDS TO BE RETURNED FOR SERVICE OR CALIBRATION. 3.3

Standard Accessories

Please check to verify that all standard accessories listed below are received in good condition. If any accessories are missing or damaged, immediately notify your Maico Special Instrument Distributor or Maico. Standard Accessories Chart Paper Dust Cover Operating Instructions Patch Cords (2 wire) Subject Response Switch Subject Dual Headset

Part Number 5496 5516 1162-9402 1025-352 2169 4687

The earphones are color-coded to eliminate the possibility of incorrect positioning. NOTE: One headset cord has a RED PLUG to identify the RIGHT EARPHONE CORD that attaches to the RIGHT PHONE JACK. The BLUE PLUG attaches to the LEFT PHONE JACK. The SUBJECT RESPONSE CORD attaches to the SUBJECT RESPONSE JACK. See figure 2.

4

Operating Instructions MA 790 3

4

5

6

2 1

FIGURE 2 MA 790 Rear Panel Description 1. AC Power Connection 2. On/Off Power Switch 3. RS 232 Connector 4. Right Phone 3.4

5. Left Phone 6. Subject Response

Optional Accessories Optional Accessories Carrying Case Audiocup Headset

3.5

Part Number 1035-3002 4695

Sound Room Installation

If the MA 790 is used in conjunction with a sound room, three patch cords are needed; two cords are needed for the headset, and one is needed for the subject response switch. two-wire patch cords must be used for the headset and the subject response switch. These patch cords are supplied with the MA 790. If you have any questions while installing your MA 790, contact your authorized Maico Special Instrument Distributor.

5

Operating Instructions MA 790 4.0 KEYPAD FUNCTION GUIDE

1

2

3

21

20

19

18

23 22 17

5 4

16

6 7

15 8

9

10

11

12

13

14

FIGURE 3 Many of the MA 790 keys have dual functions. The upper characters are used to enter data and create the set-up the MA 790. The lower characters are used to operate the MA 790 audiometer. Instructions and key functions appear on the LCD screen (23).

DATA ENTRY KEY 1. 2. 3. 4. 5. 6. 7. 8. 9.

1 2 3 4 5 6 7 8 9

FUNCTION Enters 1 Enters 2 Enters 3 Enters 4 Enters 5 Enters 6 Enters 7 Enters 8 Enters 9

AUDIOMETER FUNCTION Manual selection of 1000 Hz stimulus. Manual selection of 2000 Hz stimulus. Manual selection of 3000 Hz stimulus. Manual selection of 4000 Hz stimulus. Manual selection of 500 Hz stimulus Manual selection of 6000 Hz stimulus. Manual selection of 8000 Hz stimulus.

6

Operating Instructions MA 790 DATA ENTRY KEY 10. 11. 12. 13.

SAVE START STOP 3

14.

6

15.

4

16.

5

17.

↵

18. 19. 20 21. 22.

MENU STIM PRINT 0 Print cover LCD Display

23.

FUNCTION

AUDIOMETER FUNCTION

Saves data from manual testing and entered baselines. Starts the automatic test. Stops testing. Selects LEFT ear for Changes setting of highlighted items on the LCD automatic or manual screen testing.. Lowers intensity of Moves the highlighted box on the LCD screen. stimulus in 10 dB steps. Selects RIGHT ear for Changes setting of highlighted items on the LCD automatic or manual screen. testing. Raises intensity of Moves the highlighted box on the LCD screen stimulus in 5 dB steps. ENTER Enters completed data, selects item or moves to next screen Exits the current screen. Enters a space. Manually presents the stimulus Initiates audiogram printout. Enters 0 Access to the printer to add or change paper. Displays menu screen and test screen with patient information.

7

Operating Instructions MA 790 5.0 OPERATION AND SETUP OF THE MA 790 The MA 790 can be customized to your particular testing requirements. There are many options you can select to create the type of test and printout that suits your testing needs. 5.1

Main Menu

MA 790 MAIN MENU AUDIOMETER SETUP

DAILY CAL

3456- Change Item ↵ - Select Item Highlight the desired item and press ENTER to enter that mode: AUDIOMETER - begins subject information entry and actual testing (see Section 5.2 below). SETUP - allows customization of all aspects of the audiometer (see Section 5.3). DAILY CAL. - runs a fast daily calibration test to check the calibration of the MA 790 (see Section 5.4). 5.2

Audiometer

To begin audiometric testing highlight AUDIOMETER in the MA 790 MAIN MENU screen. Press the ENTER key. 5.2.1 Audiometer Subject Information Data Entry You may wish to have identifying data become a part of each subject’s audiogram. Data may include: Subject ID number for Social Security number, up to 9 digits Technician ID number, up to 9 digits* Job number, up to 6 digits Department, up to 6 digits Location, up to 6 digits* Exposure, up to 3 digits Protector, up to 6 digits Birth date Sex, M or F; change using 3or4keys *Data may be entered once, and until changed, is stored in memory permanently until changed.

8

Operating Instructions MA 790 Employee data is stored in the MA 790 temporary memory and appears at the top of the audiogram printout. Press the desired upper case characters on the data entry keyboard. When you have completed entering the employee data, press the ENTER key, and the next screen will appear. If the particular subject information field has not been turned on from the SETUP, PRINTOUT menu, that field will not be displayed.

SUBJECT ID BIRTH DATE SEX PROTECTOR TECH. ID

111111111 01/07/60 F 888888 123456789

↵ - Next Screen

JOB NUMBER DEPARTMENT LOCATION EXPOSURE

333333 444444 555555 777

56- Change Field MENU - Main Menu

5.2.2 Audiometer Test Screen

1000 Hz

RESPONSE

STIMULUS

40 dB HL

FREQ (Hz) 500 1K 2K 3K 4K 6K 8K LEFT (dB) 00 00 00 00 00 00 00 RIGHT (dB) 00 00 00 00 00 00 00 START - Start Test STOP - Stop Test MENU - Next Subject All keys now operate in the audiometric modes. A manual test can be performed at this time or an automatic test can be started by pressing the START key. The starting ear for the automatic test can be selected as right or left in the manual mode, then press START to start the test.

9

Operating Instructions MA 790 5.3

Setup Menu

To access the screens which lists all of the setup options, move the highlight to SETUP in the MA 790 MAIN MENU screen and press the ENTER key. The following will appear:

SETUP MENU PRINTOUT DATE/TIME MISC.

TEST PROCEDURE DATA TRANSFER

3456- Change Item

↵ - Select Item

MENU - Main Menu

Highlight the setup option that you want to change or look at and press the ENTER key. PRINTOUT allows selecting what information is on the printout. DATE/TIME allows changing the date and time. MISC. allows changing the display contrast, the beep volume or setting up a password so that no changes can be made to the setup. TEST PROCEDURE allows changes to the type of test, or setting up of a custom test (User Defined). DATA TRANSFER allows changes to the RS 232 protocol or data information. The following pages show the various screens that list the options.

10

Operating Instructions MA 790 5.3.1 Printout Menus Printout allows customization of test results and subject information allowed on the printout. Its subscreens follow. Selecting items ON will allow them to be printed on the printout. SUB. DATA is the selection of subjective data, which is represents the actual responses from the subject to every presentation of the stimulus.

BIRTHDATE SEX ECH. ID JOB NUMBER DEPARTMENT

ON ON ON ON ON

34 - Change Setting ↵ - Next Screen

LOCATION EXPOSURE PROTECTOR

ON ON ON

SUB. DATA

ON

56 - Change Field MENU - Prev Screen

CAL. DATE selected ON prints the calibration date. CAL. DUE DATE selected ON prints the calibration due date (usually one year from calibration date). AUDIOGRAM selected ON prints the X and O audiogram of the test results (Note: Only thresholds of 0-85dB appear on the audiogram).

CAL. DATE ON CAL. DUE DATE ON AUDIOGRAM ON NY STATE ON CHABA ON

AAO-1979 AAO-1965 AMA-1947

ON ON ON

34- Change Setting ↵ - Next Screen

56- Change Field MENU - Prev Screen

11

Operating Instructions MA 790 NY STATE selected ON prints the hearing impairment calculation for New York state, which is: The average of 1K, 2K, 3K minus 25dB, multiplied by 1.5 for each ear, and the better ear weighted 5 to 1. CHABA selected ON prints the hearing impairment calculation for the Committee on Hearing and Bioacoustics, which is: the average of 1K, 2K, 3K minus 35dB, multiplied by 1.75 for each ear, with the better ear weighted 5 to 1. AAO-1979 selected ON prints the hearing impairment calculation established by the American Academy of Ophthalmology and Otolaryngology, which is: The average of .5K, 1K, 2K, 3k minus 25 dB, multiplied by 1.5 for each ear, and the better ear weighted 5 to 1. AAO- 1967 selected ON prints the hearing impairment calculation established by the American Academy of Ophthalmology and Otolaryngology in 1967 which is: The average of .5K, 1K, 2K minus 25dB multiplied by 1.5 for each ear, and the better ear weighted 5 to 1. AMA1947 selected ON prints the hearing impairment calculation established by the American Medical Association in 1947 which is: the average of .5K, 1K, 2K, 3K, 4K minus 25dB, multiplied by 1.5 (monaural impairment).

.5-1-2K AVG. 1-2-3K AVG. 2-3-4K AVG. 3-4-6K AVG. 4-6-8K AVG.

ON ON ON ON ON

34- Change Setting ↵ - Next Screen

.5-1-2-3K AVG. ON WISCONSIN ON PRINT AFTER TEST ON PRINT ON COMMAND ON PRINT NAME ON

56- Change Field MENU - Prev Screen

Selecting any of the AVERAGES ON will print the average of those frequencies for each ear. WISCONSIN selected ON prints the hearing impairment calculation for the state of Wisconsin which is: the average of .5K, 1K, 2K, 3K, minus 30dB, multiplied by 1.6 for each ear, and the better ear weighted 5 to 1.

12

Operating Instructions MA 790 PRINT AFTER TEST selected on prints the entire test results at the end of the test. PRINT ON COMMAND selected ON will only print the test results when the PRINT key is pressed. If both of these are off the test will print the subjective data as the test is in progress and complete the printout at the end of the test. PRINT NAME selected ON will print the company name doing the testing (if so entered) or any other desired name. The name can be entered from the screen below and be up to 60 characters long (three lines of 20 characters each).

NAME

Maico

34- Change Setting ↵ - Next Screen

56- Change Field MENU - Prev. Screen

5.3.2 Date/Time Menu

YEAR MONTH DAY

98 8 25

34- Change Setting ↵ - Setup Menu

HOUR MINUTE AM/PM

7 30 PM

56- Change Field MENU - Setup Menu

This screen enters a new date or time. To change the information, highlight the field and use the change setting keys to enter the new data.

13

Operating Instructions MA 790 5.3.3 Misc. Menu

DISPLAY CONTRAST BEEP VOLUME SETUP PASSWORD

34- Change Setting ↵ - Setup Menu

3 3 OFF

56- Change Field MENU - Setup Menu

DISPLAY CONTRAST changes the contrast and brightness of the display (0 min. 15 max.). BEEP VOLUME changes the volume level of the keypad beep every time a key is pressed (0= off, 3= loudest). It also enables the “end of the test” or “test rejected alarm”. SETUP PASSWORD selected ON requires the user to enter a password to make changes in the setup screens. If SETUP PASSWORD is ON, changes to the MA 790 setup can only be achieved by entering the password, thereby entering setup mode. The password is 123. 5.3.4 Test Procedure Menus Test procedure allows you to customize the test to your specific needs and has several sub screens which follow.

CONTINUOUS TONE

ON

MANUAL TEST

ON

SETUP TYPE

STANDARD

34- Change Setting ↵ - Setup Menu

56- Change Field MENU - Setup Menu

CONTINUOUS TONE selects pulsed when OFF, or continuous tone stimulus when ON. Select MANUAL TEST ON to allow individual frequencies to be manually retested after a completed automatic test. SETUP TYPE selects the type of test to be used in the automatic testing mode. There are four types of tests that have been stored for use: STANDARD, NO 8K, 10 dB LOW, FAST; plus two user definable tests. The STANDARD test allows testing of all frequencies and 1 retest frequency at 1kHz in the left ear.

14

Operating Instructions MA 790 Note that if the ear is changed to start in the right ear the retest frequency also changes ears. The lower test limit is 00 dBHL and the upper limit is 95 dBHL. All start levels are set at VSL (variable start level, see following for an explanation) except for the first frequency in each ear which is set at 40 dBHL. NO 8K is the same type test except 8KHz is not tested. 10 dB LOW is the same type test as the standard test except that the lower test limit is set at 10 dB.The FAST test only tests 1,2,4 and 6KHz in each ear with the lower test limit at 10 dB and the upper limit at 95 dB. The user defined tests can be selected by changing the test type to USER1 or USER2 and pressing the ENTER key. Create your own test procedure using the following screens.

FIRST EAR SETUP FREQ START LOWER

1 1K 40 00

2 3 4 5 6 7 8 500 1K 2K 3K 4K 6K 8K VSL VSL VSL VSL VSL VSL VSL 00 00 00 00 00 00 00

34- Change Setting ↵ - Setup Menu

56- Change Field MENU - Setup Menu

SECOND EAR SETUP FREQ START LOWER

1 2 3 4 5 6 7 8 500 1K 2K 3K 4K 6K 8K 40 VSL VSL VSL VSL VSL VSL 00 00 00 00 00 00 00

34- Change Setting ↵ - Setup Menu

56- Change Field MENU - Setup Menu

15

Operating Instructions MA 790

FIRST EAR: UPPER LIMIT

34- Change Setting ↵ - Setup Menu

LEFT 95

56- Change Field MENU - Setup Menu

Up to 15 frequencies may be entered. If all frequencies are used this allows one retest frequency to establish repeatability. If fewer frequencies are used, more retest frequencies can be used, one for each ear. The START LEVEL determines the level at which that frequency will start. If VSL (Variable Start Level) is selected the test will start at 10dB above the previous threshold (Note: VSL may not be used for the first frequency). LOWER sets the lower limit for the test. This is the lowest possible dB level that the automatic test will reach if all responses are positive. It can be useful for screening tests to speed up test time. FIRST EAR is the starting ear selected at the beginning of each test. This can be changed at the beginning of each test by changing ears, and it also changes the retest ear. The UPPER LIMIT is the maximum level that the test will increase to; by setting this level low for screening tests, test time will be reduced. 5.3.5 Data Transfer

BAUD RATE PARITY STOP BITS XON/XOFF

1200 HARDWARE HAND. OFF EVEN MANUAL TRANS. OFF 2 OFF

34- Change Setting ↵ - Setup Menu

56- Change Field MENU - Setup Menu

The computer interface connector is used to connect the MA 790 through a cable to any RS-232C serial data port on a computer. The data sent is asynchronous ASCII with selectable baud rates from 110 to 9600. Parity can be selected as even, odd, or none. Stop bits can be selected as 1 or 2. XON /XOFF selected ON inserts an XON character (DC2) and XOFF character (DC4) at the beginning of each test (see section 12 for more information). Hardware handshaking ON or OFF activates or deactivates use of the CTS/RTS communication lines. MANUAL TRANSMIT selected ON allows the test results to be sent over the interface when the ENTER key is pressed at the end of the test.

16

Operating Instructions MA 790 5.4

Daily Calibration Menu

To do a daily calibration check highlight DAILY CAL. from the MA 790 MAIN MENU and press the ENTER key. Make sure the artificial patient (ME 500 Bioacoustic Calibrator) is connected properly or that the person to be tested is ready. Press the START key to begin the test. If a NR (no response) occurs on the first frequency being tested, the test will abort and instruct you to double check the cable connections plugged into the back of the MA 790.

1000 Hz

RESPONSE

STYMULUS

40 dB HL

FREQ (Hz) 500 1K 2K 3K 4K 6K 8K LEFT (dB) 00 00 00 00 00 00 00 RIGHT (dB) 00 00 00 00 00 00 00 - DAILY CALIBRATION START - Start Test EXIT - Main Menu

17