High Frequency Audiometry
Pure Tone Stenger
SISI Test (Automatic test: 5, 4, 3, 2, 1 dB Increment of 250 ms
every 5 s, Response Window = 1500 ms from start of increment)
Tone Decay Test (Automatic test, Duration: 60 s)
ABLB Test (Stimulus length: 500 ms or 1000 ms)
MLB Test (Stimulus length: 500 ms or 1000 ms)
Langenbeck Test (Effective masking noise: Narrow band noise)
Sinus or warble tone (pulsed and continuous)
Left, Right, Binaural, Bone (L+R)
Total Harmonic Distortion (THD): AC: < 2.5 %, BC: < 5.5 %
Level Steps: 1 dB, 2 dB or 5 dB (selectable in settings)
Note: For details regarding frequencies and levels see section 6.2.
AC: Standard: 125 Hz to 8 kHz, High Frequency: 9 kHz to 16 kHz
BC: 125 Hz to 8000 Hz
5 Hz sine ± 5 % modulation
Special narrowband noise stimulus.
The bandwidth is frequency depended: 125 Hz to 250 Hz – 29 %,
500 Hz – 24%, 750 Hz – 20%, 1 kHz – 17 %, 1.5 kHz – 13 %,
2 kHz 11 %, 3 kHz – 9 % from 4 kHz and up is fix 8 %
250 ms or 500 ms on/off time (selectable in settings)
AC: -10 dB HL to 120 dB HL
AC HF: -20 dB HL to 90 dB HL
BC: -10 dB HL to 85 dB HL
Insert phones: -10 dB HL to 120 dB HL
Sound field speaker with Amplifier: -10 dB HL to 115 dB HL
Safety limit: Level > 100 dB HL
Calibration information and instructions are located in the
MA 42 Service Manual.
SRT, WRS, MCL, UCL, SRT Aided, WRS Aided
Speech Stenger
Master Hearing Aid (High pass filters of -6 dB, -12 dB, -18 dB, -24 dB
per octave with cut off frequency of 1 kHz, HFE filter (High Frequency
Emphasis): high pass filter of -12 dB per octave with cut off
frequencies of 1 kHz and 2 kHz, which results in -24 dB per octave)
Freiburger Speech Test (Germany only)
QuickSIN
TM
(USA only)
To Next Page
Loading...
Need help?
General
