AC40 Support
Welcome to the product training for AC40 audiometer. On this page you will find an overview of all the available training materials and support.
Available Training
High Frequency Audiometry
What is high frequency audiometry?
High frequency audiometry (above 8 kHz) is performed using the same procedure as normal air conduction audiometry. High frequency audiometry is helpful when testing hearing impairments caused by ototoxicity, noise exposure, and acoustic traumas or in the assessment of patients with tinnitus. The frequency area is more susceptible to the effects of external factors such as medication and loud noises relative to the low and mid frequencies.
Required equipment
- A response button.
- High frequency audiometry headset (e.g. DD450) and a high frequency license installed.
Note high frequency audiometry is only available if the optional high frequency license is installed on the instrument. If the license is not installed or if the headset is not calibrated for high frequencies the HF phone button does not appear on the audiometer and the HF button and HFz button will be dimmed in Diagnostic Suite.
Test procedure
- Select the Tone and HF Phone; this will activate the high frequency audiometry function
. - Choose between HF and HFz; shows the full range of audiometric test frequencies, whereas HFz only shows the high frequency range
or 
in Diagnostic - Perform high frequency audiometry in the same way as you would perform normal air conduction audiometry.
