HATS Type 4128-C, Handset Positioner Type 4606 – User Manual48
9) Rotate the centering forks to angles that do not interfere with buttons on the side of the
handset or project much above the top side of the handset (this is to prevent them from
fouling the cheek of HATS when mounting the cradle on the cradle positioner assembly).
Tighten the forks around the handset.
10) Tighten the knob that locks the angle and the offset adjustments of the centering forks.
11) Unlock the sight and remove the cradle from the alignment jig.
The cradle is now ready to be mounted on the cradle positioner assembly and used for
measuring.
Mounting a Telephone Handset with an Asymmetrically Mounted Transducer
If the offset distance of the transducer is known, set the offset of the centering forks to the
desired value and go through the steps in the previous section. The offset of the centering forks
is set using the graduations marked on them.
If the offset distance is not known, go through steps in the previous section adjusting the
centering forks offset so as to ensure that the handset ECRP remains directly under the
alignment jig sight. In each case offset the support feet accordingly to maintain a stable
mounting for the handset.
Applying the Cradle to the Cradle Positioner Assembly
1) With the telephone handset firmly located in the cradle, attach the cradle to the cradle
positioner assembly in the second swivel joint and lock it in place with the screw fitting at
the opposite end of the joint.
2) Slide the barrel of the cradle positioner assembly to move the cradle along the ERP axis
until the telephone handset is firmly pressed against the HATS pinna. Now use the collar to
lock the barrel in place.
3) For further adjustments along the ERP axis, use the screw adjustment mechanism on the
barrel operated by rotating the sleeve.
4) The force with which the handset is being applied to the pinna can be read off the scale at
the opposite end of the barrel to where the displacement readings are shown.
Note: Measurements in the HATS position require the use of the “soft pinnae” supplied, as the
pinna needs to be able to deform to allow the correct positioning of the handset ECRP.
Rotation in Three Planes
All three adjustment angles A, B and C (see Fig.4.9.7–9) rotate about the handset
ECRP point. When operating the angle adjustments, disengage the locking mechanism first by
loosening the locking knobs.
A allows the handset to be rotated about the ERP axis and is set from on top of the Mounting
Bracket. (The ERP axis is parallel to the y
m
-axis described in section 4.3.5.)
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