High-frequency Head and Torso Simulator (HF HATS) Type 5128 – User Manual
44
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°.
✐Please note: The standard handset position ERP and ECRP (Ear Cap Reference Point) of the handset are
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
e
unit vector
•±6 in rotational degree of freedom B, defined as clockwise rotation about the z
e
unit vector
•±5 in rotational degree of freedom C, defined as clockwise rotation about the y
e
unit vector
The acceptable range of offset of the MECRP relative to ECRP are.
• +15/–10 mm along unit vector y
e
• ±10 mm along unit vector z
e
Note that the application force employed to the handset against the HATS ear will define the
position of the handset along the y
m
-axis or the ‘ERP-axis’. That is, movement of the handset
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.
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