Monitor Instruments, Inc.
Monitor Instruments, Inc. is a manufacturer of industrial audiometers and audiometric accessories, offering quality instruments and professional calibration services for audiometers and acoustic safety equipment since the early 1970's.
(800) 853-6785  ·  (919) 732-5400  ·  FAX (919) 732-6153  ·
The MI-3000 Audiometer
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The MI-7000

A microprocessor audiometer for industrial hearing conservation programs

The MI-7000 is a microprocessor-controlled screening audiometer designed specifically for use in industrial hearing conservation programs. Both flexible and easy to use, it can be programmed to meet the demands of very large-scale programs where extensive demographic data must be collected, stored, printed, and downloaded with threshold values to a computer database. Yet it can be quickly reprogrammed to allow the operator to press one button to start and print a completed test with no further data entry or control manipulations. Programmed options are battery-backed and remain in effect until changed by the operator. Tones are generated and controlled entirely by digital circuits, allowing the output levels of the MI-7000 to be adjusted through secured keyboard entry. The LCD display simultaneously shows all thresholds established for both ears as well as ongoing test conditions.


  • Versatile operation: Offers quick, one-button operation or large-scale testing with data export
  • Small footprint: Built-in printer reduces space requirements
  • Time-saving: Programmable operations streamline testing process
  • Highly compatible: Works with numerous hearing conservation software packages


  • Small, lightweight, and portable
  • Fast, quiet, built-in printer
  • Built-in talkover (automatic pause while in use)
  • Test storage capability
  • Numeric keypad for additional demographic/data entry
  • Menu for setting programmable operations
  • Complies with OSHA test requirements and qualifies as a microprocessor
  • Allows for field calibration of output levels
  • Wide operating voltage range, automatically adapts to both domestic and foreign supply
Testing features...
  • Pause and resume capability
  • Switch from automatic to manual as needed
  • Start with either ear with option to test 8kHz
  • Expanded attenuator range from -10 to 90 (selectable 0-90 dB range for compatibility with OSHA requirements)
  • Error messages displayed on screen and in easily understood terms
  • “Listening” test controlled by the patient response switch from inside the booth
  • Adjustable audible alert for end-of-test and error conditions
Printouts include...
  • Three-frequency-threshold averaging
  • Time, date, and elapsed time of test
  • Selected patient demographics
  • Flagged manually determined thresholds
  • Also, option to print current audiometer settings
Communications features...
  • Serial port for external communication
  • RS-232 data string compatible with popular output formats
  • Compatible with numerous hearing conservation software packages


Test Frequencies: 500, 1000, 2000, 3000, 4000, and 6000 Hz. 8000 is optional

Frequency Accuracy: Crystal controlled, less than 1% error at all frequencies

Frequency Sequence: Start either ear, 1000, 500, 1000 retest, 2000, 3000, 4000, 6000, (optional 8000). Second ear, 500, 1000, 2000, 3000, 4000, and 6000 (optional 8000)

Intensity Range: Expanded to -10 to 90 dB hearing levels in 5 dB steps (0–90 dB range selectable)

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 automatic mode with full manual override capability

Testing Time: On a cooperative individual or biological simulator, approximately 5.5 minutes (testing 8 kHz)

Stimulus Characteristics:
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 pulse train is varied randomly between 1 and 2 seconds.
C. Patient response window is 1.8 seconds from the beginning of the pulse train.
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 and signaled.
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 meet ANSI S3.6 1996 standard for Audiometers and OSHA 29 CFR 1910.95. Output levels calibrated through secured keyboard entry.

Safety: Powered by a Safety Extra Low Voltage (SELV) input from a UL -listed, detachable power supply

Earphone: Telephonics Corporation TDH-49 earphones with MX-41/AR cushions

Power Requirements: 100-240 VAC 47-63 Hz, 1A

Physical Dimensions: 3” high, 9.5” wide, 11.5” deep. Requires 3” of space in rear of unit for paper roll

Net Weight: Unit, 5 lbs; earphone assembly, 1 lb; power supply, 1 lb

Standard Equipment:

  • MI-7000 audiometer with printer
  • Earphone assembly
  • Patient response switch
  • Power supply
  • AC power cord
  • Patch cords (2)
  • Paper roll (2)
  • Operator manual

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