19 Technical specifications
129
MADSEN Zodiac
Characteristics for pulsed stimuli (ipsilateral)
Pulsed stimuli are used for ipsilateral Reflex Screening and Reflex Threshold testing.
Period:
120 ms
Stimulus On time:
56 ms
Stimulus Off time:
64 ms
Rise/fall time:
5.5 ms
Stimulus presentation control
On-Off ratio:
70 dB (for stimulus level > 95 dB HL)
A weighted SPL in Off:
Contra supra-aural TDH 39: 33 dB
Contra insert phone: 23 dB
Tympanometry accuracy description (daPa/s)
Pump speed
Min.TW, 5% error
(daPa)
Min. TW, 10% error
(daPa)
Min. SA, 5% error
(daPa)
Min. SA, 10% error
(daPa)
50 daPa/s
9
7
6
4
100 daPa/s
17
14
11
8
200 daPa/s
24
20
18
14
400 daPa/s
38
31
31
23
600 daPa/s
53
43
42
32
Broadband noise
Contralateral TDH-39 headphone
Bandwidth:
250 - 6000 Hz. Tolerance ±5 dB re. 1 kHz level.
Slope:
Spectrum level drops between 6000 and 9500 Hz and remains below -23 dB
re. 1 kHz level for frequencies above 9500 Hz.
Level:
Noise level is indicated in dB HL. Tolerance ±5 dB.
Contralateral insert earphone and ipsilateral probe
Bandwidth:
400 - 4000 Hz. Tolerance ±5 dB re. 1 kHz level.
Slope:
Spectrum level drops between 4000 and 7000 Hz and remains below -23 dB
re. 1 kHz level for frequencies above 7000 Hz.
Level:
Noise level is indicated in dB HL. Tolerance ±5 dB.
