 |
|  | Air-conduction with 8 frequencies from 250 Hz to 8 kHz | | | Bone-conduction with automatic masking (ST 20 BC) | | | Diagnostic functions (ST 20 SISI) | | | Slim (letter-page size) and lightweight (1,9 kg) instrument | | | Optional handheld loudspeaker for pediatric tests | | | Optional LCD-Display for level and frequency or SISI test score | | | Optional serial PC-interface | | | Optional patient response button with flashing light display | |
 | | Test signal | Pure tone or pulsed pure tone | |
| | Test frequencies | 0,25; 0,5; 1; 2; 3; 4; 6; 8 kHz | |
| | Level steps | 5 dB noise free | |
| | Masking signal | white noise, automatic sliding: AC = -15 dB, BC = + 15 dB distance to test signal level | |
| | Masking source | contralateral headphone | |
| | Stimulus button | Interruptor or Presenter function (selectable via user-setup) | |
| | Standards | IEC 601-1; IEC 645 part 1, class 4; medical directive 3/42/EEC, classe IIa (CE 0124) | |
| | Power supply | Mains 230 V~, 50/60 Hz, app. 4 VA | |
| | Dimensions and weight | W x D x H: 29 x 22 x 6 cm / 1,9 kg | |
| | Standard accessories | Headphones, mains cable (2,5m), audiogram paper | |
| | Air-conduction: Dynamic range | -10 to 100 dBHL (90 dB at 0,25 kHz, 6 kHz, 8 kHz) | |
| | Headphones | HOLMCO 8103B26 with sound-excluding ear muffs | |
| | Bone-conduction: Dynamic range (only ST 20 BC and ST 20 SISI) | -10 to 70 dBHV (35 dB at 0,25kHz, 40 dB at 6 kHz, 60 dB at 0,5 and 4 kHz, 65 dB at 3 kHz) | |
| | Bone-conductor | B71 with headband | |
| | SISI-Test (only ST 20 SISI): Modulation test signal | 4,8/0,2s; 1 dB (test); 5dB, 3dB, 2dB (conditioning) | |
| | Free field (option) | -10 to 90 dBHL (10 cm distance) | |
| | LCD-display (option) | 16 digits, view angle adjustable | |
| | Patient response switch (option) | ergonomic handheld switch | |
| | Carrying case (option) | lightweight, durable aluminium suitcase | |
| | PC-interface (option) | serial RS 232C, 9-pin connector MAICO-protocol, NOAH-driver | |
| | |
| |
