HATS Type 4128-C, Handset Positioner Type 4606 – User Manual26
Fig.2.4 Second and third harmonic distortion of the mouth simulator
Harmonic Distortion
Fig.2.4 shows typical second-harmonic and third-harmonic distortion of the mouth simulator.
Overload Protection
The mouth simulator of Type 4128-C has a built-in overload protection circuit, which will
trigger automatically if the drive signal applied to the loudspeaker is too great or remains on for
too long. The circuit can be seen on top of the mouth and ear mounting block if the head is
split. It allows continuous operation up to 10 W and pulsed operation up to a maximum of 50W
for 2seconds. If these limits are exceeded, the circuit disables the mouth simulator output. The
protection circuit resets approximately half a minute after the drive signal is disconnected. The
effect of the overload protection circuit can be seen in Fig.2.5.
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
100 1k
Frequency (Hz)
dB
2nd Harmonic
3rd Harmonic
10k
990227
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