Mechanical Function Check
Before using the audiometer, plug it in for ten minutes and then check the mechanical function. (Form is available here.)
1. Power On - make sure there is power to the audiometer.
2. Jacks Seated - make sure the jacks are in the proper receptacle and are pushed in all the way.
3. Earphone Cushions - the cushions should be clean, pliable and free from breaks or tears.
4. Dials Tight - turn the frequency and attenuator dials to check for slippage. Loose dials should be tightened before the audiometer is used.
5. Headband Tension – put on the earphones. There should be enough tension so that when positioned on the head, the earphones rest snugly on the ears.
6. Tone ON/OFF (REV/NORM) - turn the switch to ON (NORM) position and the sound should be on. The sound should be off in OFF (REV) position.
7. Cords OK - with the selector switch on "right", turn the tone interrupter switch to the ON or NORM position. Gently twist the cord by the right earphone and at the jack position; turn the sound to "left" and check the left cord. If the sound cuts out or becomes scratchy, the connections must be tightened or cords must be replaced.
8. Volume Increase/Decrease - turn the Hearing Level (HTL) dial and listen for loudness changes.
9. Pitch Change - change the frequency dial and listen for changes in pitch.
10. Tone Presenter Switch(es) - press the switch and the sound should come on if the tone is in the OFF (REV) position. If the tone is in the ON (NORM) position, the tone should go off “when the switch is pushed.” Check both switches if the audiometer is so equipped.
11. Static - no static should be heard. Static may indicate dirty contacts and they can be "cleaned" by rotating the dials quickly.
12. Cross Talk – as you listen to the left phone, no sound should be present in the right phone and vice versa.