Chapter 2
Temporal Latency in InitialLatencyLi: < 5 ± 5 msec.
ARLT Mode (From signal onset to 10% ofAmplitude)
Terminal Latency Lt: < 5 ± 5 msec
(From signal offset to 90% of Amplitude)
Rise Time Tr:
<30 ±5 msec.
(From 10% to 90% of Amplitude)
Fall Time Tt:
<25 ±5 msec.
(From 90% to 10% of Amplitude)
Multi Frequency Resonant Frequency Measurement Accuracy: 50 Hz or 5%,
whichever is greater
NOTE
Resonant frequency is defined as the frequency at which “Delta B” is
zero (B is measured at + 200 daPa and at “Peak Pressure”).
Probe Signal
Frequencies:
(Sinusoidal)
Discrete:
226 Hz, 678 Hz, 1000 Hz
Multi Freq: From 250 Hz to 2000 Hz
Multi Frequency Increment:50 Hz
Frequency Accuracy:
Discrete and Sweep ±1%
From 250 to 1000 Hz ±1%
Above 1000 Hz
±2%
Harmonic Distortion:
<2%
(Measured in an HA-1 2cc Coupler)
Signal Level (In Real Ear and In Normal Test mode):
226 Hz:
85 dB SPL
678 Hz:
80 dB SPL
1000 Hz: 75 dB SPL
NOTE
All Probe Tone levels at all frequencies are set to be nominally 70 dB HL.
Signal Level Accuracy:
226 Hz: ±1.5 dB SPL
Other Frequencies: ±3.0 dB SPL
2 - 12 Grason-Stadler
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