The MI-5000B Series II Microprocessor Audiometer is one of the
lowest-priced field serviceable microprocessor audiometers available
today. It administers computerized tests securing valid, reliable data
quickly and cost effectively. It is very easy to understand and use, and
can be used either alone, or interfaced with an external printer or
computer. Interface settings can be changed by the operator. Tones are
generated and controlled entirely by digital circuits, allowing output
levels of the MI-5000B to be adjusted by through secured keyboard entry.
The LCD display simultaneously shows all thresholds established for both
ears, as well as on-going test conditions.
- Built in talk over with automatic pause while in use
- 2 in 1 serial port configuration (pin-out compatible with older
- Excellent immunity to low line voltages
- Rugged construction
- Allows for field calibration of output levels
- Three frequency threshold averaging on printouts
- Capability for switching from automatic to manual as needed
- Option to start either ear, and whether to test 8 kHz.
- Starting ear, whether to test 8 kHz and other audiometer
parameters can be stored in non-volatile memory
- 'Listening' test controlled by the patient response switch from
inside the booth
- Optional automatic shut off after one hour when not in use
(selection stored in non-volatile memory)
- Elapsed test time printed on test results
- Flags on printout show which thresholds were determined manually
- Audible alert for end of test and error conditions (toggled
active or inactive from front panel)
- Error messages displayed on the screen in easily understood
- Pause and Resume capability
- Compatible with numerous hearing conservation software packages
- Complies with OSHA test requirements and qualifies as a
Test Frequencies: 500, 1000, 2000, 3000, 4000, and 6000 Hz. 8000 Hz
Frequency Accuracy: Crystal controlled, less than 1% error at all
Frequency Sequence: Start either ear, 1000, 500, 1000 retest, 2000,
3000, 4000, 6000, (optional 8000). Second ear, 500, 1000, 2000, 3000,
4000, 6000 (and 8000 optional).
Intensity Range: From 0 dB to 90 dB Hearing Level (HL) in 5 dB steps.
Attenuator Linearity: Less than 0.75 dB error for any 5 dB step, less
than 1 dB error for any 10 dB step, less than 2 dB accumulated error
relative to the calibration level.
Tone Rise/Fall Times: 44/32 ms typical.
Test Paradigm: Modified Hugheson Westlake in the automatic mode with
fully manual override capability.
Testing Time: On a cooperative individual or a biological simulator,
approximately 5 ½ minutes (testing 8 kHz.).
A - Pulse train is 1.2 seconds with 50% duty cycle (200 ms on and 200 ms
off) with three pulsed tone presentations.
B - Time between tone presentations is varied randomly between 1 and 2
C - Patient response window is 1.8 seconds from the beginning of the
D - Pulse train terminates when response switch is depressed.
Error Warnings: Audible alert (when active) with visual display of
specific error encountered. The following error conditions are detected
A - Threshold not established at 1000 Hz, first ear.
B - Retest failure at 1000 Hz.
C - Patient responding when no tone is being presented.
D - Switch not released.
E - Failure to establish threshold within allotted time (pause and alert
optional at this error).
Audiometer Calibration: All audiometer calibration parameters will
meet ANSI S3.6 1996 Standard for Audiometers and OSHA 29 CFR 1910.95.
Output levels are calibrated through secured keyboard entry.
Safety: Listed to UL544 Standard for Medical and Dental Equipment and
CSA C22.2 No. 125-M1984 Environment Products/Health Care Technology.
Earphone: Telephonics Corporation TDH -49 earphones with MX-41/AR
Power Requirements: 120 VAC, 60 Hz, 32 VA
Physical Dimensions: 2.75" high, 7.5" wide, 9" deep.
Net Weight: Unit, 2.6 lbs; Earphone, 1 lb; Transformer, 1.2 lbs.
MI-5000B Audiometer with RS-232 output and internal talkover
Patient Response Switch
Patch Cords (2)