Interacoustics AC 40 is a highly advanced, two in one clinical and
research instrument incorporating a Diagnostic High Frequency Audiometer. In the
AC40 we believe we created an instrument which truly combines the sophisticated
test capability of a research audiometer together with easy access to all the
test procedures expected by a hearing health professional.
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Full Manual Control
The extensive use of dedicated keys greatly facilitates manual testing
enabling full and direct access to all functions.
Automatic Test Battery
More than 15 different pre-programmed automatic tests are available. The parameters of these tests may be altered by the user without the use of a PC or other external device.
Built-in HF Audiometer
The AC40 incorporates a full range high frequency diagnostic audiometer,
providing frequencies up to 20000Hz. The multi-frequency facility may also be
used at higher frequencies and narrow band masking will track the stimulus
frequency throughout this entire range.
Store Function
The store function enables a patient's results from the different test modes to be stored in an internal memory as they are obtained. All results may be shown "on-line" as a test progresses or recalled from the memory for viewing. Masked and unmasked air and bone conduction thresholds, free field results, speech scores, Fowler curves and MLD results.
Speech Score Counter
The built-in speech score counter is the perfect tool for plotting speech curves, or for hearing aid evaluation. The counter is easily operated using the incorrect/correct score keys. These keys have been specially developed by Interacoustics to operate without producing noise which may interfere with speech testing.
High Frequencies
18 kHz and 20 kHz are available for high frequency pure tone testing in the numerical readout screen. (AC40 software version 1.48 or better).
130 dB out of TDH39
It is possible to get 130 dB out of the TDH39 Earphones in the tone menu from the "Numerical Readout" mode. The instrument does not have to be re-calibrated.(AC40 software version 1.46 or better).
Multi Frequency
The multi-frequency function of the AC40 can be set-up by the user and is
adjustable in steps from 1/1 to 1/24 of an octave. It can be activated in all
manual and automatic threshold determining tests, making eg. swept tone Békésy
possible, in steps of 1/24 of an octave up to 16000Hz.
Dedicated Keys
For maximum ease of operation, the most commonly used functions are accessed by dedicated command keys. The operator therefore has direct access to e.g. Input, Output and intensity controls.
Full Communication
The AC40 is fully equipped for two way communication between patient and operator with both "Talk Forward" and "Talk Back" facilities.The "Talk Back" function and the "Monitor" for Channel 1 may be selected simultaneously, enabling the operator to hear both stimulus and the patient's response. The operator may choose to use either the built-in loudspeaker of the AC40 or the optional operator headset for monitoring. An additional output for an "assistant monitor" is provided which can be extremely useful when an assistant is working in the sound booth.
Optional Integral Printer
The optional integral printer for the AC40 is a fast high quality thermal printer which provides permanent copies of all test results. Results, together with any information entered by the optional keyboard, may be printed out in single or multiple copies. The AC40 also provides a direct output for connection to a suitable laser printer employing HP-GL/2 language.
Two Independent Oscillators
The two independent oscillators of the AC40 make it possible to perform a
wide range of advanced and retrocochlear tests. The two oscillators, which are
required for compliance as an EN 60645-1 Type 1 instrument, also make MLB
testing possible.
Large Back-Lit Graphic Display
The large back-lit Liquid Crystal Graphic Display provides visual communication between the AC40 and its operator. The display will show all the results obtained by the AC40 "on-line" as a test progresses. The large size of the display allows test results for both ears to be shown at the same time, providing the operator with the additional advantage of a comprehensive test survey. The display also provides information on the different "soft-key" functions as they change for different test routines.
Printer Connection
The AC40 is equipped with a dedicated printer output allowing direct connection to any laser printer employing HP-GL/2 printer language. This makes provision for very fast, high quality printouts in a standard filing format.
Push-button or Rotary Switches
To satisfy the demands of daily work routines, the AC40 has been designed with the option of either push-button or rotary switch attenuator control.
Built-in Free Field Amplifiers
The AC40 can be supplied with optional built-in power amplifiers at a fraction of the cost of external amplification. These internal amplifiers will provide enough output to satisfy the majority of sound field requirements. Should a higher output be required, the AC40 may be connected to the Interacoustics AP70 external amplifier.
Computer Connection
The AC40 is supplied with an RS232C interface as standard, allowing easy connection to a suitable computer. With its on-board software, the AC40 ensures rapid transfer of all test results.
A variety of software for PC is available:
National software may be available in addition to the above mentioned
possibilities. Please consult your local Audiometrics
representative for details.
Test Types
Tone: Manual, continuous, single pulse, pulsing (variable).
Speech: Live voice, Tape or CD inputs. Built-in goose neck microphone.Score Counter: Calculates % of correct score for speech.
ABLB: Individually adjustable pulse speed and pulse length.
TTdecay: Calculation according to Rosenberg (1958)
Békésy Test: 125Hz to 16kHz.
Difference Limen Intensity: 0.0dB - 5.0dB in 9 different steps
Difference Limen Frequency: 0.0%-5.0% in 9 different steps.
Masking Limen Difference: Noise out of phase and signal out of phase. Automatic calculation.
Monaural Loudness Balancing: Programmable test set-up.
SISI: 0, 0.2, 0.4, 0.6, 0.8, 1, 2, 3, 5 dB, 20 increments. Automatic score counter which calculates in % the number of responses to 1 dB increments.
Stenger: Pure tone or Speech can be used for Stenger test.
Auto Threshold: Patient controlled Hughson-Westlake Test after ISO 8253. 3 out of 5 or 2 out of 3 as response criteria. Reduced frequency range option for rapid test.
Others: As the many functions of AC40 may be controlled manually, a
great variety of tests are possible.
AC40 Specifications Back
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