HATS Type 4128-C, Handset Positioner Type 4606 – User Manual14
The SPL values in the table differ from those given in the instruction manuals for the calibrator.
This is because the calibration coupler influences the actual sound pressure level at the
microphone diaphragm, and the coupler used for calibration of Type 4128-C is different to that
normally used for microphone calibration.
Note: The condenser microphone is an integral part of the ear simulator and must not be
removed from the ear simulator assembly.
1.6.1 Dismantling the Head and Torso Simulator
Separating the Head from the Torso
Note: Before removing the head from the torso, the rubber pieces in the base of the torso
through which the cables run should be removed. This avoids putting unnecessary stress on the
cables and connectors.
Separate the head from the torso by turning the head through 90
in either direction and then
pulling it out from the torso. Cables attached to both the ear simulator and the mouth simulator
can be pulled through the torso once the rubber pieces in the holes at the base of the torso
(through which the cables run) have been removed. When replacing the head, make sure the
marks on the neck of the torso are lined up with the line where the head splits. This ensures that
the head is facing exactly forwards. This is how the head should be positioned in relation to the
torso for the vast majority of applications, but the head can be set at other angles if required.
Also, remember to refit the rubber pieces in the base of the torso once the cables from the head
have been threaded through the holes.
Splitting the Head
In normal use you will not need access to the inside of the head, but if it is required the head
should be split as follows:
1) Separate the head from the torso as described above.
2) Remove both pinna simulators by sliding each of them towards the front of the head and
then pulling the backs of them outwards.
3) Remove the two Allen bolts from the rear of the right ear and from the rear of the left ear
position (see Fig.1.6). A 3mm Allen key, QX-1172, is supplied for this purpose.
4) Remove the two Allen bolts from the back of the head, which can then be separated from
the front. The ear simulator, mouth simulator and mounting-block will remain secured in
the front half of the head. The soft “cushion” in the top of the head can be removed.
5) Although not normally required, complete removal of the ear simulator, mouth simulator
and mounting-block from the shell of the head is possible when the final four Allen bolts
(two from the front of each ear position) are removed.
To reassemble the head, simply reverse the above procedure. Ensure that the soft
“cushion” is replaced in the top of the head above the overload protection circuit before
the two halves of the head are put back together. To refit a pinna simulator, push its front
edge into the front of the ear-recess in the head and then push the back of the pinna in
towards the head.
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