Maico MA 28 - Page 45

Operation Manual MA 28
8506915 Rev. 5
44
05/05/2021
Calibration
Calibration information and instructions are located in the MA 28
Service Manual.
Air Conduction
DD45
MAICO Standard Values
IP30
ISO 389-2, ANSI S3.6
DD450
MAICO Standard Values
DD65 v2
MAICO Standard Values
Bone
Conduction
B71
ISO 389-3, ANSI S3.6
B81
ISO 389-3, ANSI S3.6
Placement:
Mastoid
Effective masking
ISO 389-4, ANSI S3.6
Transducers –
Headband tension
DD45
Headband Static Force 4.5 N ± 0.5 N
DD450/DD65 v2
Headband Static Force 10.0 N ± 0.5 N
B71/B81 Bone
Headband Static Force 5.4 N ± 0.5 N
Patient Response
switch
One push button
Patient
communication
Talk Forward (TF)
Special tests/test
battery
Auto threshold:Hughson Westlake:
Time window for patient response: 2 s
Inputs
Tone, Warble Tone +5 %, 5 Hz (true sine wave frequency modulation)
Outputs
Left, Right, Bone
Accuracy
Frequency ± 2 %
Precision
1 dB or 5 dB
Stimuli
Tone
125 Hz - 8000 Hz
Warble Tone
5 Hz sine +/- 5 % modulation
Pulse Tone
Pulse Length: 250 ms or 500 ms
Masking
Narrow band noise: IEC 60645-1, 5/12 Octave filter with the
same center frequency resolution as pure tone. Synchronous
masking: Locks channel 2 attenuator to channel 1 attenuator
Alternative: White noise
Presentation
Presenter or Interrupter. Single, Pulse or Warble.
Level
AC: -10 dB HL to 110 dB HL
,
BC: -10 dB HL to 80 dB HL Available
Extended range function: Warning displayed when 100 dB HL
reached. Extended range is accessed automatically. Extended
range only available when mains powered and not with USB-
Cable connection.
Frequency
range
125 Hz to 8000 Hz. Frequencies can be freely deselected
(except 1000 Hz)
Weight MA 28:
1.9 kg / 4.1 lbs
Dimensions
MA 28:
380 mm x 270 mm x 140 mm
14.96 in x 10.62 in x 5.51 in
Display:
4.3 in in in full color display with normally white LED back-light
Language Settings:
Deutsch, English, Español, Franҫais, Italiano, Nederlands,
Polski, Русский, 中文.
PC Connection:
1 x USB B for PC Connection (comparable with USB 1.1 and later)
Warm-up time:
Approx. 1 minute (incl. bootup-time)