Welch Allyn AM 232 Manual Audiometer - User Manual - Manual (Page 4)

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Chapter 3
Operation 25
Preliminary check 26
Instructing the subject 27
Placing the earphones 27
Response handswitch 27
Audiogram form 28
Routine calibration check 29
Routine test administration 30
HL control (F3) 30
Range Extension pushbutton (F2) 30
Tone Type Selector (F9) 30
Typical testing session 31
Pretest Review 31
Familiarization 31
Determining the threshold (Pure Tone) 32
Testing procedure 32
Chapter 4
Routine Maintenance 33
Calibration 34
Earphone cords 34
Hum and random noise 35
Distortion and frequency shift 35
Special messages 35
CAL 35
Exx 36
Bibliography 37