BRUEL & KJAER HATS 4606, Руководство пользователя

Страница: 49 / 68

CHAPTER 4
Handset Positioner for HATS Type 4606 Features and Functions
41
4.3 Handset Positioner Table and Standardized Measurements
The table in Fig.4.12 has been developed to provide a convenient means of noting down all
measurement parameters to make repeatable measurements and to set up Type 4606 for
standardized measurements according to ITU-T Rec. P.64. The table provides fields for all the
parameters with graduated scales on them.
4.3.1 Centering Fork
The front and rear labels relate to the centering fork placed closest to the front support and rear
support, respectively. The offset label relates to the scale on the crosspiece of the centering fork
which should be read off at the point where the crosspiece passes through the yoke (see Fig.4.4)
as shown in the Handset Positioner Table in Fig.4.12. Five sockets are provided for mounting the
centering forks and the rear support foot. These sockets are numbered 1 – 5 with socket 1 closest
to the front support.
4.3.2 Support Foot
Front and rear share the same definitions as the centering forks along with socket position.
However, the front support is fixed and cannot be placed in other sockets. The height is read off
the graduated shaft of the support at the point where the shaft emerges from the cradle bar. The
foot of the support (in which the spikes are mounted, see Fig.4.4) slides from left to right on a
ratcheted guide. The foot has markings running from –5 to +5, the offset position of the foot can
be read from the number above the pointer at the centre of the guide. The spikes can be placed
in holes on the foot. The holes correspond to even numbers on the foot markings. The type and
position of the spike is noted, for example: ‘4S’ (4S represents two short spikes positioned in the
– 4 and 4 positions respectively. For long spikes L should be used to replace S in the label.
4.3.3 End Stop
The end stop values are read from where the graduated shaft emerges from the sleeve that forms
its guide.