Portable hearing screening instrument

Microcomputer control, easy operation, easy to carry; Let alone headphone jack, you can test out the respective left and right ear hearing loss; Provide pure tone, warble tone, narrowband noise and filtering complex, the sound test tone; Light stimulation, suitable for young children; Specifications: Signal frequency error: ± ≤ 4% Signal voltage error: ± ≤ 5% Protective earth resistance: ≤ 0.1Ω Continuous leakage current: normal ≤ 0.5mA, single fault ≤ 1mA Portable hearing screening instrument Acoustic performance: Pure-tone center frequency: 0.5k Hz, 1.0k Hz, 2.0k Hz, 3.0k Hz, 4.0k Hz Warble tone center frequency: 0.5k Hz, 1.0k Hz, 2.0k Hz, 3.0k Hz, 4.0k Hz WAVE: 5 ± 1Hz Deviation: ± 5% Modulation frequency: 5 ± 1Hz Narrowband noise center frequency: 0.5k Hz, 1.0k Hz, 2.0k Hz, 3.0k Hz, 4.0k Hz Filter composite tone: Bell center frequency: 0.7k Hz Frogs center frequency: 1.6k Hz Bird center frequency: 3.0k Hz Electrical properties: the center frequency error is less than ± 3%, the total distortion of the waveform is less than ± 5% Applications: For Hospital ENT, MCH, child protection agencies Branch and the various rehabilitation, special education, deaf schools, ordinary schools resource room, hearing and other aspects of the screening test