Maico MA 33 - Page 77

Operation Manual MA 33
8100092 Rev. 9
75
19/08/2019
AUDIOMETRY
Patient Response
switch
One push button
Patient communication
Talk Forward (optional, PC only)
Masking signals
Narrow band noise masking for tone: with the same center
frequency resolution as pure tone
Speech noise for speech: 12 dB/octave above 1 kHz (± 5 dB),
manually or automatically adjustable
Tone: Effective Masking: ISO 389-4, ANSI S3.6
Speech: Selectable effective masking or SPL
Air Conduction
DD45:
MAICO Standard Values
DD45 HB7:
MAICO Standard Values
DD65v2:
MAICO Standard Values
Bone Conduction
B71W
ISO 389-3, ANSI S3.6, Mastoid Placement
Transducers –
Headband tension
DD45
Headband Static Force 4.5 N ± 0.5 N
DD45 with HB7:
Headband Static Force 4.5 N ± 0.5 N
DD65v2:
Headband Static Force 10.0 N ± 0.5 N
B71W
Headband Static Force 5.4 N ± 0.5 N
Tone Audiometry
Tone Tests
HL, MCL, UCL, Stenger, PTA, SISI
Hughson-Westlake (option): Time window (Pause) selectable
between 0.5 s and 3.5 s, 5 dB steps (increase)/10 dB (decrease)
Selection
PTA, selectable frequencies
Inputs
Sinus or warble tone (pulsed and continuous)
Outputs
Left, Right, Bone (L+R)
Accuracy
Frequency ± 2 %, Level ± 3 dB
Stimuli
Tone
AC: 125 Hz to 8000 Hz
BC: 250 Hz to 6000 Hz
Warble Tone
5 Hz sine ± 5 % modulation
Pulse Tone
Pulse Length: 250 ms
Presentation
Presenter or Interrupter
Intensity
AC: -10 dB HL to 105 dB HL, BC: -10 dB HL to 75 dB HL
Available Intensity steps: 5 dB
Safety limit: Intensity > 70 dB HL
Frequency range
AC: 125 Hz to 8000 Hz, BC: 250 Hz to 6000 Hz
Calibration
Calibration information and instructions are located in the MA 33
Service Manual.
Speech Test
Speech Tests
SRT, SAT, WRS, MCL, UCL, Stenger
Speech Signals
Microphone, WAVE files or CD-ROM