GSi 61 - Hearing Level and Frequency Limits

Grason-Stadler GSI
®
61 CLINICAL AUDIOMETER
Hearing Level and Frequency Limits
Hearing Level (dB HL)
It is not possible to select a dB HL value outside the limits for a particular transducer/
frequency combination. An attempt to change or select a hearing level control that
is outside of the limit will result in the following:
1. The dB HL will stop at the limit value, or
2. The dB HL will go to the nearest allowable level.
In either case, the dB HL display will flash momentarily and then the test channel
value will be replaced with NR (No Response). If an audiogram is displayed and the
limits for a frequency/transducer are reached, the symbol for no response is displayed
in the audiogram. When Speaker is selected on both channels and the optional
booster amplifier is not installed, it is possible to increase Channel 2 to a higher
hearing level if Channel 1 is lowered. For example, select SPKR/SPKR, 1000 Hz,
Tone/Narrow Band, and Left for Channel 1 and Right for Channel 2. Set both
Channel 1 and Channel 2 at the maximum dB HL levels. If Channel 1 is lowered by
5 dB, it is possible to then increase Channel 2 by 5 dB.
Frequency Limits
It is not possible to select a test frequency that is invalid for a particular transducer.
The Test Frequency buttons will roll over to the lowest frequency after the last valid
frequency or the frequency will automatically go to the nearest valid value when a
different transducer is selected.
dB HL Limits per Frequency and Transducer
Single 1761-9630 1761-9635
Insert
Sound Sound
Phone
Field Field
45
45
Azimuth
Azimuth
N/A 70 70
100
65 75
110
95 100
110
100 105
110
100 105
110
100 105
110
100 105
110
105 105
105
105 105
90
95 95
N/A
80 80
N/A
80 60
95
90 96
1761-9639
Sound
Field
45
Azimuth
75
90
110
110
110
110
115
115
115
105
85
100
75
102
Test Ear Bone Bone E A R
Signal, Phone Vibrator- Vibrator- Tone
Pure
Mastoid Forehead 3A Insert
Tone
Phone
125
85 N/A N/A 90
250 105 45 33 100
500 120 65 51 110
750 120 70 57 115
1000 120 75 66 115
1500 120 80 69 115
2000 120 80 68 115
3000 120 80 68 115
4000 120 75 67 115
6000 110 50 39 105
8000 100 45 35 90
12000 75 N/A N/A N/A
Speech 105
2
65 56 110
2-24
High
Frequency
Ea
r
1
Phone
1761-0100 Rev. B