0D / HAC (Hearing Aid Compatibility of Mobile Phone)
Result Templates Template Based Post Processing
HAC evaluates the E- and H-nearfields of a radiating device, typically
a mobile phone, in a 2D plane parallel to the front cover of the device,
centered to the speaker point.

Pre-requisite to run the result template is therefore the definition
of both E- and H-field monitores for the frequencies of interest. The
speaker point needs to be marked with a working coordinate system (WCS)
with the origin in the speaker point and the u-v-plane parallel to the
front cover. The WCS needs to be stored (“WCS -> Store Current WCS…�
According to the specification of ANSI C63.19 a 50mm x 50mm area is
spanned in 15 mm distance from the speaker point and subdivided in nine
sub-grids. By unchecking the ANSI C63.19 checkbox user-defined areas can
be considered. Also the resolution of the field evaluation can be specified
(default: 1mm).
Power Scaling:
It can be chosen if the power is scaled to port
power or to accepted (radiated) power.
AWF:
Depending on the transmission protocol an “Articulation
Weighting Factor, AWF�gets defined. For CDMA, TDMA (50 Hz), UMTS (WCDMA)
and TDMA (22Hz and 11 Hz) the AWF equals 0 dB, for GSM (217) it is -5dB.
“Abs value = simple square sum�
Instead of the real field vector maximum the
absolute value gets computed from “Emax = Sqr(|Ex max|^2 + |Ey max|^2
+ |Ez max|^2). This value is always larger then the real amplitude, but
may represent the way typical measurement equipment is working.
Logfile:
The essential information of the HAC evaluation
is shown in the logfile. All nine E- and H-fild values are shown in original
and scaled form. Additionally the HAC category of each sub-grid value
and those values that get excluded according ANSI C63.19. At the bottom
the final HAC category is shown together with the global exclusion scheme:
�T: Both E- and
H are considered (“Taken�
�E: E-Field got
excluded
�H: H-field got
excluded
�A: Both (“All�
are excluded
Show E / Show H:
The E- or H-field in the plane of HAC evaluation
is visualized. The plots get scaled to display both the minimum mand maximum
value within the domain of evaluation (“scan area�. Additionally the
nine sub-grids are displayed.

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E-field |
H-field |
See also
Preloaded
Result Templates, Preloaded
Macros Overview, Monitor

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