Chapter 2
Click Stimulus Guaranteed Peak Equivalent SPL Levels:
Ipsi: 110 dB SPL
Contra: 120 dB SPL
Peak hold SPL to peak equivalent SPL transfer data.
(Peak hold SPL = peak equivalent SPL + transfer data)
Ipsi:
8.5 dB
Contra: 5.5 dB
ClickRate Range: 50-300 Pulse/sec.
Click rate accuracy: ±1pulse/sec.
Pulse Width (Electrically Measured): 100 msec.
Pulse Rise/Fall Time (Electrically):
5.0 msec.
Frequency Spectrum:
Ipsi:
50 - 4000 Hz
Contra:
50 - 3600 Hz
NOTE
Frequency spectrum uniformity better than: 10 dB
External Input: At 0.5 VRMS:
1 KHz Upper Limits:
Ipsi:
110 dB SPL
Contra: 120 dB SPL
Stimulus Signal ON/OFF Ratio: >70 dB
Presentation Control OFF mode signal level: <20 dB SPL
Signal To Noise Ratio: >70 dBA
Measured with disabled probe signal and “A” weighting for noise
measurement.
Residual noise: <25 dBA SPL
(Stimulus Present switch in OFF position)
Unwanted Acoustic Probe Signals: <60 dBA
Measured while pump is operating and probe tone is disabled
.
Measure it
with “A” weighted filter in “SLOW” time mode.
The noise in normal
operating mode will not effect the immittance measurement accuracy.
Signal separation between Ipsi and Contra channels; all frequencies: >70 dB
(Measured at the probes with the “ON” channel set to 90 dB)
Leaked signal: <20 dB SPL
The radiated acoustic noise from the instrument (with reflex stim off) when
measured at 1 meter from the instrument, shall be:
<50 dBA
(“A” weighting and “SLOW” averaging)
2 - 16 Grason-Stadler
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