User`s manual

12.9 MEASURING LOUDSPEAKER SINGLE POLAR DATA (3D MODE)
Using a single PC controlled turntable (Outline ET2503D or LinearX LT360) under
CLIO’s control and automation it is possible to easily collect a single loudspeaker
polar with a naming convention equal to the 1D Mode (refer to 12.6 and 12.7).
The 3D autosave mode is available with QC version software only.
The advantage of this mode is that the turntable is automatically positioned without
any operator intervention.
12.9.1 PREPARING AUTOSAVE AND THE MLS CONTROL PANEL
The MLS measurement should be set in a particular way in order to automatically
acquire the responses at various polar angles. To do this we will use the
turntable control and the autosave dialog.
Let's start with setting the autosave function (see also 5.3). Pressing Alt-F2 we
recall the Autosave Setting dialog (fig.12.20); here we choose the 3D mode and
input the desired file name ('RogersHalfChirp'), polar start (-180), polar step (5),
polar stop (180), azimuth start (0), azimuth step (0) and azimuth stop (0).
Figure 12.20
By setting the azimuth angles at zero CLIO will save the files as:
<NAME><THETA*100>.MLS
where NAME is a common file name and THETA is the azimuth angle. These
quantities are separated by spaces, it is possible to give negative numbers to
THETA.
The MLS menu is now ready to start taking measurements; we only need to
properly set the turntable and its control.
12.9.2 PREPARING THE TURNTABLES
We assume that an ET250-3D turntable is properly connected to your PC (refer to
4.7 for details). To prepare for this measurement session you need to link the
turntable. At the beginning of the measurement session or by clicking the sync
button on the turntable CLIO will move the turntables to the -180 angle. Thus the
turntable must be set up to be in the 0 position with the loudspeaker on-axis with
the microphone.
172 12 WATERFALL , DIRECTIVITY & 3D