GSI 18
Overview
The GSI 18 is a single channel, manual audiometer. It is a direct replacement for our GSI 17. Its stylish design along with its portability, built-in battery compartment and ability to store calibration data for both TDH 39 and EAR 3A or 5A insert phones makes the GSI 18 the ideal solution for school system and industrial hearing screening programs.
Features
 | The Affordable, Easy-To-Use Screening Solution. For nearly 50 years, Grason-Stadler has designed and manufactured state-of-the-art instruments recognized for their outstanding quality and performance. You'll see this quality the first time you try the GSI 18 Audiometer. The Affordable Audiometric Screener What's more, the GSI 18's ergonomic design makes performing tests easier than ever before. Front panel controls are clearly labeled and HL levels displayed in large numbers on the GSI 18's LCD screen. |
Audiogram Steps
| Step 1 - Preparing the subject for a test: | • Put your subject at ease. • Make sure the subject understands the task. • Use the following instructions: “I am going to place these earphones over your ears. You will hear a variety of tones - some high, some low, some loud, some very soft. Whenever you hear, or think you hear one of those sounds, raise your hand. Lower your hand when you no longer hear the sound. Remember that though some of the tones will be easy to hear, others will be very faint. Therefore, you should listen very carefully and raise your hand whenever you think you hear the tone”. |
| Step 2 - Place Headphone/Insert Ear Phones on patient: | 1A: If using Headphones, select on the front panel. • Eliminate all obstructions between the earphones and subject. • Place the headband solidly on the crown of the subject’s head. • Center the earphones carefully over both ears. 2B: If using Insert Earphones, select on the front panel. • Examine the ear canal for obstruction or excessive cerumen. • Make sure the sound tube is not blocked. • Insert the black tubing of an ER-3A foam eartip completely onto the nipple of the sound tube. • Roll the foam tip into the smallest diameter possible. • Insert the eartip well into the ear canal. Interaural attenuation is improved with deep insertion. • Allow foam to expand to acoustically seal ear canal. • Discard foam eartips after a single use. |
| Step 3 - Conducting the Threshold Test: | Familiarize your subject with the test and determine the start point: 1. Start with the “better” or RIGHT ear. 2. Demonstrate a tone for the subject using 1000 Hz at 40 dB HL. 3. Set the HL control to -10 dB. 4. Hold the present bar down and gradually increase the intensity until a response occurs. Switch the tone off and present it again in 2 seconds. If the subject responds again, this is the “start” point. If the subject does not respond again, repeat this step. Determine the threshold: 5. Present the tone 10 dB below the “start” point. 6. Present the tone for 1 or 2 seconds. The time between the tones should vary, but should not be shorter than the test tone. 7. With each response, decrease the tone 10 dB for the next presentation. 8. After each failure to respond, increase the tone 5 dB until the first response occurs. 9. Continue with DOWN 10 dB, UP 5 dB until the threshold is reached. Threshold = minimum dial setting at which a response has occurred 2 times on an ascending scale. 10. Record the threshold on the audiogram. NOTE: Repeat steps 5 - 10 for each tone setting in the following order: 1000, 2000, 3000, 4000, 6000, 8000, 1000, 500, 250 Hz. If there is a difference of 20 dB or more between two successive octaves, test the inter-octave frequencies: 750, 1500, 3000 Hz. |
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Setting The Clinical Standard