CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

L 1kHz
L 10kHz
Inductance at 10kHz
Inductance at 10kHz
13.7.3 TS STEP BY STEP
Getting TS requires two impedance measurements. As we will use both methods we
need three, the first relative to the driver in free air, the second to the driver with a
known mass (delta mass) added to the cone, the third to the driver loaded with a known
volume (delta compliance). Fig.13.20 shows the results of the three measurements,
overlaid in one single graphic.
50.0
CLIO
180.0
Ohm
Deg
40.0 108.0
30.0 36.0
20.0 -36.0
10.0 -108.0
0.0 -180.0
10 100 1k Hz
10k 20k
Figure 13.20
The black curve refers to free air, the red to delta mass, the green to delta compliance.
As you can see adding a Mass determines lowering Fs while loading the cone with a
closed volume will increase Fs. Always check this is the case to avoid errors in the post
processing routine. As deriving TS parameters can be performed at any successive time
after the impedance measurements has been taken, we suggest to save them with
meaningful names as well as to use the Notes Dialog to store the measuring conditions
as mass weight and/or volume. The last step before pressing Go in the TS dialog is to
measure both the voice coil DC resistance and the effective cone diameter in
millimeters. In this example they are 6.41 Ohm and 133mm. Finally we select File Data
as data origin and pressing Go we get the following prompt Dialog
140 Chapter 13 - Measuring impedance and T&S parameters