BRUEL & KJAER 4128-C - Page 22

HATS Type 4128-C, Handset Positioner Type 4606 – User Manual16
Fig.1.7
The positions of the fixing
holes on HATS. All
dimensions shown in mm
1.6.3 Calibration CD
Each Type 4128-C comes with a CD containing calibration data both in ASCII format and for
use with Brüel &Kjær PULSE Audio Analyzer. The CD contains calibration measurements for
the mouth simulator and the right ear simulator (Type 4158-C) of Type 4128-C-001 and, for
Type 4128-C-002, also for the left ear simulator (Type 4159-C). When upgrading Type 4128-
C-001 to Type 4128-C-002 (adding the left ear simulator), a separate calibration CD with left
ear simulator data is supplied. The calibration data supplied is listed in Table 1.2. Only the
listener frequency responses and the talker frequency response are individually measured for
every HATS. The other measurements are typical. The variation between different HATS is
small and is mainly due to sensitivity variations between the ear simulators. Because of this,
the individual measurements can be used to “correct” the typical measurements for a particular
HATS. For example, using the post-processing facilities of PULSE it is simple to divide the file
L_000_00 by the file LFR_R (these are theoretically the same; any difference is due to the fact
that one is individual and the other typical). The result of this division is the variation from
typical of the ear simulator sensitivity, and so can be multiplied by any other ear measurements
to “correct” the typical curve.
For users of Brüel&Kjær Audio Analyzer Type 2012 with floppy disk drive, appropriate files
are contained on the CD as well. To generate a Type 2012 compatible calibration disk, simply
copy all files within the directory “2012dat” to a formatted floppy disk.
12
12
44
35
38
38
20
20
38
38
35
110 ± 2
267.5 ± 2
203
220.5
100 ± 2
100 ± 2
990092
60