Interacoustics AC40 - Selecting TDH39 Headset

AC40 Service Manual Page 32
Selecting TDH39 headset
Select “Transducer Setup” (Figure 2)
Select “Headset phone” to select TDH39 headset
Enter the serial numbers for the left and right phones in the field “Left” and “Right”
Figure 2
Calibration of TDH39
Equipment needed for TDH39 calibration:
Measuring amplifier
Acoustical IEC 60318-3 (IEC 303) coupler 
Frequency counter
Correction values for coupler