Microphone: For live voice testing and communications
External A and External B: Accepts recorded speech material from external
stereo tape cassette or CD player
Intensity Range:
Air Conduction: -10 dB HL to 105 dB HL
Bone Conduction:
Mastoid -10 dB HL to 65 dB HL
Forehead -10 dB HL to 55 dB HL
Sound Field:*** -10 dB HL to 90 dB HL
Paired Inserts:*** -10 dB HL to 95 dB HL
Single Insert:*** -10 dB HL to 95 dB HL
Masking Intensity Range
Speech Noise:
Air Conduction (TDH 50P and Insert Phones*) and Bone
Conduction
Maximum dB HL are the same as the speech type signals.
Sound Field: -10 dB HL to 80 dB HL
White Noise: Equal to Speech Noise
*** Optional Accessories
Steady: Tone continuously present.
Pulsed: Tone pulsed 200 mSec ON, 200 msec OFF.
FM: Tone modulated ± 5% of center frequency at a rate of 5 Hz.
ALT: Tone alternating between Channel 1 and Channel 2: Channel
1 is 400 mSec ON, 400 mSec OFF followed by Channel 2, 400 mSec
ON, 400 mSec OFF.
SISI: An intensity increment is added to a tone in the selected channel for
200 mSec, every 5 seconds. The HL increments are available in 1, 2
or 5 dB steps.
High Frequency: Tone testing in the frequency range of 8 kHz to 20 kHz
using High Frequency phones or Sound Field.
The frequencies available for testing are: 8 kHz, 9 kHz,
10 kHz, 11.2 kHz, 12.5 kHz, 14 kHz, 16 kHz, 18 kHz
and 20 kHz (Optional).
Talk Forward: Permits the tester to speak through the test microphone into the
selected transducer at the intensity level set by the front panel
controls.
Talk Back: Allows the tester to listen to comments from the subject in the
testing booth.
Monitor: The monitor headset or monitor speaker can be used by the tester
to listen to Channel 1, Channel 2 and/or Talk Back signals.
W x D x H: 20 inches x 15 inches x 12.6 inches (LCD raised)
50 cm x 39 cm x 32 cm
Height with LCD lowered - 6 inches (15 cm)
Weight: 19 pounds 8.7 kg
Shipping Weight: 30 pounds 13.6 kg
Grason-
tadler GSI® 61 CLINICAL
Speech Channel 1 and
Channel 2
Signal Format
Special Test
Capabilities
Communications and
Monitoring
Dimensions and
Weight
vi
1761-0100 Rev. B
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