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Operation

Routine test administration

Transducer selection

The GSI 18 provides options for either headphone or insert earphone transducers.

Selecting the

will apply the calibration values for the headphones

Selecting the

will apply the calibration values for the insert earphones

To make the selection

for headphones, press the

button and the Headphone icon will flash on the

LCD. To confirm the selection, push the

button again

To make the

selection for insert earphones, press the

button and the insert earphone icon

will flash on the LCD. To confirm the selection, push the

button again.

See Appendix B for applied reference threshold values (RETSPL) for both the DD45

Earphone and the ER3A Insert phones.

HL knob

The HL knob increases or decreases the signal intensity in 5 dB increments. Rotating

the Control knob clockwise increases the intensity; counterclockwise decreases

intensity. When the maximum or minimum available intensity is reached for any

frequency, the display will flash.

1718-0100 Rev. E 2-6

GSi 18 User Manual

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