BRUEL & KJAER 4128-C - 7.2 Specifications Type 4128-C and 4128-D

HATS Type 4128-C, Handset Positioner Type 4606 – User Manual52
The Standard Handset/HATS Position According to ITU-T Rec. P.64 Annex E.1
For the standard handset position, 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 mm scale on the
handset positioner barrel (the ERP-axis). The nominal angles for the standard handset position
are  A = 21.2,  B = 12.9,  C = 2.3. Note that for the standard handset position ERP and
ECRP (Ear Cap Reference Point) of the handset are coincident.
The Alternative Handset Positions According to ITU-T Rec. P.64 Annex E.2
For the alternative position, 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.4.12.
The actual angle settings, MCERP settings and application force can be noted down in the
Handset Positioner Table, Fig.4.11.
4.3.6 Conformity with Telephone Test Head Type 4602(-B)
The “HATS-position” of ITU-T Rec. P.64 annex E.1 can also be implemented on the Telephone
Test Head Type 4602(-B). When this table top telephone test head is fitted with the supplied
HATS positioning jig, the position corresponds directly to the standardised “HATS-position”.