The Standard Handset Position; The Alternative Handset Positions - BRUEL & KJAER HF HATS 5128 User Manual

44 High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual

The Standard Handset Position

For the standard handset position, according to ITU-T Rec. P.64 Annex E.1, the settings of the
three angles are clearly marked on the handset positioner by an 'H' at  A,  B and  C and by
'ERP' on the displacement scale on the handset positioner barrel. The 'H' indicates that this is the
standardized 'HATS-position' as specified in ITU-T Rec. P.64 Annex E.1. The nominal angles for the
standard handset position are  A = 21.2°,  B = 12.9°,  C = 2.3°.
✐
The standard handset position ERP and ECRP (Ear Cap Reference Point) of the handset are
Please note:
coincident.

The Alternative Handset Positions

For the alternative position, according to ITU-T Rec. P.64 Annex E.2, the three angles  A,  B and
 C can be rotated within acceptable ranges relative to the standard position – and the
Manufacturer-defined Ear Cap Reference Point (MECRP) allows for movement of the ECRP point
on the surface of the phone.
The acceptable ranges of handset rotation about the MECRP are:
• ±6 in rotational degree of freedom A, defined as clockwise rotation about the x
• ±6 in rotational degree of freedom B, defined as clockwise rotation about the z
• ±5 in rotational degree of freedom C, defined as clockwise rotation about the y
The acceptable range of offset of the MECRP relative to ECRP are.
• +15/–10 mm along unit vector y
• ±10 mm along unit vector z
Note that the application force employed to the handset against the HATS ear will define the
position of the handset along the y
takes place along the 'ERP-axis'. See Fig.4.13.
The actual angle settings, MCERP settings and application force can be noted down in the
Handset Positioner Table, Fig.4.12.
e
e
-axis or the 'ERP-axis'. That is, movement of the handset
m
unit vector
e
unit vector
e
unit vector
e