Ambco 2500 User manual

Model 2500 – User Manual
AMBCO 2500
AUDIOMETER SYSTEM
WITH FIVE YEAR WARRANTY
Model 2500 Audiometer with Printer and OTO-Chek Biological Test
Simulator
MICROPROCESSOR CONTROLLED PURE TONE AUDIOMETER AUTOMATIC,
SEMIAUTOMATIC, MANUAL HEARING TESTS INTERNAL MEMORY FOR
STORAGE TESTS COMPUTER COMPATIBLE
AMBCO Electronics
15052 REDHILL AVE SUITE #D • TUSTIN, CA 92780 • [phone] • FAX [phone]
WWW.AMBCO.COM
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Model 2500 – User Manual
The AMBCO Model 2500 is an easy to use microprocessor
controlled air conduction pure tone audiometer for testing
hearing.
OUTSTANDING FEATURES
AUTOMATIC, SEMIAUTOMATIC, MANUAL TESTS
PRINT AND STORE TEST AUTOMATICALLY
INTERNAL MEMORY STORES UP TO 260 TESTS
COMPUTER COMPATIBLE
LARGE CHARACTER LCD DISPLAY
MONITOR TEST CONDITIONS IN PROCESS
INPUT SOCIAL SECURITY NUMBER FOR ID
LARGE PRINT OUT OF RESULTS
CALIBRATION DATE, TEST DATE ON REPORT
FAST PRINT (Less than 20 seconds depending on
printer)
VISUAL AND AUDIBLE ALARMS
PAUSE, RESUME FOR OPERATOR CONTROL
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Model 2500 – User Manual
TABLE OF CONTENTS
1.0 ABOUT THE 2500 ……………………………………………………….…………………….……………….5
1.1 Features and Specifications of the Model 2500 5
1.2 To Get Started 6
1.3 Connections on the Back Panel 6
1.4 Front Panel Button Locations 7
1.5 The Audiometer Display 7
2.0 QUICK START REFERENCE……………………………….……………………………………..………....8
2.1 Checking Your Instrument 8
2.2 Instructing the Patient How and When to Respond 8
2.3 Starting a Standard Automatic Test 8
2.4 How to Enter Patient Information 8
2.5 Printing and Storing Your Completed Test Results 8
2.6 How to Interrupt an Automatic Test 9
2.7 If You Need to Perform a Manual Test 9
2.8 Testing Individual Frequencies 9
2.9 When You Need to Transfer Memory to a Computer 9
3.0 BASIC AUDIOMETER CONTROLS………………………………………………….......................9
3.1 How to Adjust the dB Level 9
3.2 Selecting the Test Frequency 9
3.3 Which Ear is Being Tested? 10
3.4 The Tone Type Being Presented 10
3.5 Presenting a Tone to the Patient 10
4.0 PROCEDURES USED FOR AUTOMATIC TESTING……………………………………..…..…..10
4.1 Tone Presentation Sequence and Response Window 10
4.2 Entering Patient Test Information 11
4.3 Setting the Job ID for Several Tests 11
4.4 What is Validity Checking? 11
4.5 Entering Pause Mode and Test Options 11
4.6 If a Patient has Trouble During an Automatic Test 12
4.7 Daily Biological Simulator Tests 12
5.0 SCROLLING TEST DATA………………………………….…………………………………………………12
5.1 Checking Your Test Data for Accuracy 12
5.2 Recording Your Final Test Results in Memory 13
5.3 Test Review Display 13
6.0 SYSTEM SWITCH SETTINGS………………………….…………………..................................13
6.1 Making Adjustments to the Clock 13
6.2 Changing the Control Switches 13
6.3 If your Display is Hard to Read 14
6.4 Displaying the System Information 14
7.0 OPTIONAL ACCESSORIES……………………………………………..………………………………….14
7.1 AMBCO 5 Year Limited Warranty 14
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Model 2500 – User Manual
APPENDIX………………………….………………………………………………………………………………….….…15
I. Turning Off an Alarm 15
II. Errors Caused by the Patient 15
III. What to Do When There is a Test or System Error 15
IV. Connecting to a Computer for Data Transfer 15
V. Setting the Switch Options 16
VI. What is Printed on an Audiogram 17
VII. OTO-CHEK 18
VIII. 2500 Quick Reference 19
IX. OTO-CHEK Quick Reference 20
X. How to send your audiometer for calibration or repair 21
XI. Form to send in with your audiometer for service 22
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Model 2500 – User Manual
1.0 ABOUT THE 2500
The AMBCO Model 2500 is a microprocessor controlled air conduction pure tone
audiometer designed for the testing of hearing.
The Model 2500 user interface has been expanded with scrolling help messages, system
switches and extended automatic, semi-automatic and manual test modes.
Please familiarize yourself with the 2500 by reviewing this manual so that your testing
will be easy, accurate and fast.
1.1 FEATURES AND SPECIFICATIONS OF THE MODEL 2500
Meets performance requirements of ANSI S3.6-1989
OPERATING TEMPERATURE: 15° to 30°C (59°F to 86°F)
PRODUCT TYPE:Pure Tone, Type 4 Audiometer
TEST FREQUENCIES
AUTOMATIC (HZ): 500, 1000, 2000, 3000, 4000, 6000, 8000 (with validity check at 100
Hz)
SEMI-AUTOMATIC & MANUAL MODES: 250, 500, 750, 1000, 1500, 2000, 3000, 4000,
6000, 8000 (see Appendix V to disable 8000 Hz in automatic mode)
FREQUENCY ACCURACY: Less than 3% – Typically better than 2%
TOTAL HARMONIC DISTORTION: Less than 3%, typical 1%
HEARING LEVEL RANGE: 0 to 95 dB in 5 dB increments (250 and 8000 Hz, 0 to 85 dB)
POWER SUPPLY: 107-127 VAC 60 Hz, 10 Watts, UL approved (Optional 220 VAC 50/60
Hz available)
AC Adapter Output:12VAC nominal at 1000mA
HEARING LEVEL ACCURACY /Attenuator linearity: ± 1 dB
STIMULUS: Steady or pulsed
RISE/FALL TIME: 20 - 50 ms
DATA OUTPUT:RS-232 9600 Baud, 8 bits, no parity, DTR handshake
EARPHONES: TDH-39 or DD45 (10 OHM)
CASE: Injection molded, impact resistant A.B.S. plastic
DIMENSIONS: Width 10 inches, Length 8 inches, Height 4.2 inches
TOTAL WEIGHT: 4.0 Lbs.
WARRANTY: 5 Years on base system
STORAGE CAPACITY: Up to 260 Audiograms
DISPLAY: 0.375” high, 2 line by 16 characters, backlight LCD
PRINT TIME: Typically less than 20 seconds (printer dependent)
PC STORAGE SYSTEM: Contact AMBCO for availability
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Model 2500 – User Manual
1.2 TO GET STARTED
Packing List:
1 – 2500 Audiometer base unit
1 – 12 VAC wall mount adapter
1 – Pair of TDH-39 headphones
1 – Patient Response Switch
1 – Instruction Manual
1 – Printer interface cable
Unpacking your 2500 Audiometer – Remove the 2500 from its shipping container.
Check for any visible damage, and contact AMBCO or an authorized distributor if any
damage is noted. Place the 2500 on a flat table, and connect the AC adapter to the AC
jack on the back panel. Connect the patient response to the BLACK jack, and right and
left earphones into the RED and BLUE jacks, respectively. If you have a printer, connect
the printer cable to the printer connector on the back panel and to your printer.
1.3 CONNECTIONS ON THE BACK PANEL
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Model 2500 – User Manual
1.4 FRONT PANEL BUTTON LOCATIONS
1.5 THE AUDIOMETER DISPLAY
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Model 2500 – User Manual
2.0 QUICK START REFERENCE
Plug the AC adapter labeled ‘AUDIOMETER’ into the jack on the back panel, and plug the
adapter into 117 VAC. Turn on power switch located on the back panel. After the Model
2500 conducts an internal check, the display shows the Time and Date:
‘Time 10:31’
‘Date 01/01/96’
2.1 CHECKING YOUR INSTRUMENT
If you have an OTO-CHEK or similar type of biological simulator, connect it to the 2500
prior to checking your instrument. Press the ‘AUTOTEST’ to start test sequence. The
display will show SS#. Press the ‘AUTOTEST’ button twice more to begin a test. After a
complete cycle has been completed, an alarm will sound. Press ‘PRINT’ to output the
threshold levels to your printer. If you did not connect an OTO-CHEK, ‘N/R’ will be
printed as the response level (no response). Your AMBCO 2500 is now operating
correctly.
2.2 INSTRUCTING THE PATIENT HOW AND WHEN TO RESPOND
-The patient should be instructed to respond only when a tone is heard.
-Respond immediately when the tone is heard, preferably while the tone is
on.
-Respond by pressing and RELEASING the patient response switch.
-Inform the patient that the Model 2500 is programmed to present pure
tones of varying frequencies and intensities at random intervals.
-The Model 2500 recognizes and monitors false (guessing) responses and will
alarm if the patient registers 4 false responses at any frequency.
-Most importantly, this is a test to establish the patient’s true hearing
threshold level, therefore the speed at which this test is given is not
necessarily significant.
2.3 STARTING A STANDARD AUTOMATIC TEST
The ‘AUTOTEST’ button is used to run a completely automatic hearing test. Press
‘AUTOTEST’ to start test and enter patient information per Section 2.4.
2.4 HOW TO ENTER PATIENT INFORMATION
Before a new test begins, you may enter the patient’s Social Security # and Job ID #.
Change each digit using the ‘INC SS#’ and ‘DEC SS#’ buttons, then move the cursor right
using ‘NEXT CHARACTER’ or left using ‘EVALUATE/CLEAR.’ By pressing ‘AUTOTEST’ a
second time, you may skip the SS# entry (SS# = 000000000), and again to skip the Job ID
entry (uses the current Job ID Number). AUTOTEST will begin, displaying the test
frequency, ear and dB level being presented (see Section 4.0).
2.5 PRINTING AND STORING YOUR COMPLETED TEST RESULTS
When all required testing has been completed, press and release the “PRINT’ button to
output the audiogram to a printer or PC and save the test record in memory. Press
‘PRINT’ to obtain additional hard copies if needed.
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Model 2500 – User Manual
2.6 HOW TO INTERRUPT AN AUTOMATIC TEST
During an automatic test sequence, you can interrupt the test in progress by pressing
the ‘PAUSE’ button. Use this feature if the patient is having difficulties, or if you wish to
conduct a manual test. The 2500 will complete the current tone presentation, displaying
the message ‘Pausing 000.’ After the current test stops, the message “Test 000 PAUSE
OPTION…’ indicates that you are in Pause mode. You may press the following:
‘TONE’ Manually outputs tones to the patient, records responses
‘EVALUATE/CLEAR’ Halts all testing and erases the test
‘PAUSE/RESUME’ Continues the current automatic sequence
‘PRINT’ Ends current test, prints out the test, saves test in memory
2.7 IF YOU NEED TO PERFORM A MANUAL TEST
To give a manual test with a printout, press ‘EVALUATE’ then press ‘PAUSE’ 3 times
(waiting 1 second between pushes). The 2500 is now in manual mode. Frequency, dB
levels, ear select and tone select are set by the operator. Upon completion of testing,
press ‘PRINT’ to print results of manual test.
2.8 TESTING INDIVIDUAL FREQUENCIES
To test a single frequency and ear, select the dB level, frequency and ear you wish to
test, then press the ‘EVALUATE’ button. If this is a new test, you will be prompted to
enter the patient SS# and Job ID # before starting the evaluation per Section 2.4. To
bypass, SS# and Job ID #, press ‘AUTOTEST’ twice to start test. When you have
completed all required testing, press the ‘PRINT’ button to output results to the printer
or PC and store the test in memory.
2.9 WHEN YOU NEED TO TRANSFER MEMORY TO A COMPUTER
The internal memory can store up to 260 tests for transfer to a computer. Start your PC
software. Be sure to follow the instructions specific to your software. Connect the 2500
to your PC, turn it on, and press and hold the ‘PRINT’ button for 4 seconds. All stored
test records are output starting from 000 to the last test recorded, displaying each test
number as it is transferred. You may transfer memory as many times as needed, even if
the audiometer is turned off and on. IMPORTANT! – To erase all memory contents,
simply start and save a new test anytime after transferring memory. This erases all
previously recorded tests.
3.0 BASIC AUDIOMETER CONTROLS
3.1 HOW TO ADJUST THE dB LEVEL
By pressing ‘INC dB LEVEL’ OR ‘DEC dB LEVEL,’ the operator can adjust the tone output
level for semi-automatic or manual testing.
3.2 SELECTING THE TEST FREQUENCY
Pressing ‘INC F’ / ‘DEC F’ increases or decreases the selected frequency for semi-
automatic and manual modes.
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Model 2500 – User Manual
3.3 WHICH EAR IS BEING TESTED?
Right or left earphones are selected by pressing ‘RIGHT / LEFT.’ The selected earphone
is displayed on the LCD panel as R for right and L for left.
3.4 THE TONE TYPE BEING PRESENTED
Pressing ‘TONE SELECT’ toggles the presentation sequence from Pulsed to Steady mode.
Each press of ‘TONE SELECT’ will toggle between Pulsed and Steady tone presentation
modes. Pulsed mode is selected when you turn on the 2500.
3.5 PRESENTING A TONE TO THE PATIENT
The ‘TONE’ button is used to present operator specified frequencies and dB levels to a
patient being tested. By selecting the frequency/ear/dB level in the idle mode
(displaying time/date), a ‘Sample Tone’ may be presented to the patient prior to starting
an automatic test. If the Steady tone has been selected, the tone output will remain on
until the ‘TONE’ button is released.
4.0 PROCEDURES USED FOR AUTOMATIC TESTING
Pure tone, air conduction testing is done according to established audiometric
procedures. A tone of controlled length (see Figure 6.1) is presented to the patient, and
then the unit waits for a response from the patient response hand switch.
AUTOTEST mode always starts at 30 dB, 1000 Hz, right ear. A positive response will
decrease the dB level by 10 dB (stopping at 0 dB) until there is no response, at which
point the dB level is increased in 5 dB increments until the patient responds twice at the
same dB level, thus establishing the Hearing Threshold Level for that frequency and ear.
If there is no response to the initial tone presentation, the dB level will increase in 20 dB
increments until there is a positive response. If there is no response to the highest dB
level, a NR (No Response) is recorded. If a response occurs outside the response window
(false response), the tone presentation is repeated at the current settings.
4.1 TONE PRESENTATION SEQUENCE AND RESPONSE WINDOW
Test Procedure Example
Start of test – ‘30 dB R 1000 Hz’ is displayed (Semi-Automatic mode):
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