GSi TYMPSTAR 1, Service Manual

Page: 36 / 224

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