TYPE OF SIGNALS
• Pure tone: sine wave
• Warble: ± 5% frequency sine wave modulated,
modulation: sine wave 5 Hz
• Narrow band noise: 24dB/oct filtered noise
• Speech noise: 1khz 12dB/oct filtered noise
• White noise
• External signal
• External mike
• Speech material recorded on SD card
• Master Hearing Aid: 1kHz 6, 12, 18 ,24dB High pass filters
• On/Off rise – fall time: 40msec
OUTPUT TRANSDUCERS
• ACR, ACL: 10 ohm DD45 matched pair earphone,
(alternatively HDA280 Sennheiser, Insert earphones)
• BC: B71W Radioear; B81 (optional)
• INSERT: Button receiver
• Free field output: 600 ohm impedance
• Monitor Phone: headset with boom microphone
STIMULUS PRESENTATION MODALITY
• Presentation: Normal, Reverse, Extended (present tone for
1 second from 20dB below the maximum level)
• Modality: Continuous, Pulsed (rate 0,5; 1 and 2 Hz),
Alternated (ABLB and MLB – 0,5, 1 and 2 Hz)
• DLI increment levels:
0,1 in steps of 0,1dB up to 1.0dB; 1,5-2-3.4.5 dB
• DLI increment recurrence rates: 0.5Hz, 1Hz, 2Hz
• SISI increment recurrence rates: 0.2Hz, 0.5Hz, random.
Time on 300ms
• SISI increment level: 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 5 dB
• Bekesy: mode sweep and fixed; Continuous, Pulsed and
LOT; exam duration 30sec and 60sec.
* R37A-HF only
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Key Tags: Clinical Audiometer | Clinical Diagnostic Audiometer