The controls on the front panel of the GSI 61 are shown below.
The GSI 61 contains two independent HL rotary controls for test signal and masking
intensity level control with a range of -10 dB HL to 120 dB HL (If the High Frequency
option using Sennheiser earphones is installed and active, the High Frequency intensity
level control ranges from -20 dB HL to 110 dB HL). Maximum dB HL values apply
to the mid-frequencies with earphones only. Refer to the specific transducer for dB
HL limits in the Table on page 2-24.
These pushbuttons allow the operator to change the intensity step size to 1.0, 2.0 or
5.0 dB. When the GSI 61 is powered up, the dB step size is automatically set to the
default of 5 dB increments
.
These pushbuttons are also used to select the intensity
increase when testing in the SISI mode.
2-5
Chapter 2 - Installation
Front Panel Controls
Attenuators
(HL Controls)
Channel 1
and Channel 2
dB Ste
Size
1761-0100 Rev. B
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