User`s manual

Audiomatica Srl Sinusoidal 04/07/2001 10.13.34
CH A dBV Unsmoothed Stepped Delay [ms]: 0.000 Dist Rise [dB]: 30.00 File: cvreference.sin
10 100 1k 10k 20k10 Hz
0.0
dBV
180.0
Deg
-10.0 108.0
-20.0 36.0
-30.0 -36.0
-40.0 -108.0
-50.0 -180.0
CL IO
Figure 13.12
Let’s now proceed with measuring the device. Connections need to be changed as
in Fig. 13.13. We are now going to measure the voltage across Rs, which is
proportional to the current in the device. Leaving everything in the Sinusoidal menu
as it was for the previous measurement we obtain Fig.13.14. It seams a strange
shape if you are not used to. But in fact we are measuring Current here and,
Voltage being constant, it decreases at resonance (from Ohm’s law I=V/R).
INPUT A
INPUT B
OUTPUT A
OUTPUT B
CLIO
R
S
POWER AMPLIFIER
RED
BLACK
Figure 13.11
Audiomatica Srl Sinusoidal 04/07/2001 10.52.16
CH A dBV Unsmoothed Stepped Delay [ms]: 0.000 Dist Rise [dB]: 30.00 File: cv.sin
10 100 1k 10k 20k10 Hz
-10.0
dBV
180.0
Deg
-20.0 108.0
-30.0 36.0
-40.0 -36.0
-50.0 -108.0
-60.0 -180.0
CL IO
Figure 13.14
What we do from now on is just post processing. Leaving the last measurement in
memory, open the Processing Tools Dialog from within Sinusoidal (MLS has the
same), select the CV icon and input the data you should know.
The Ohm value is that of the Sensing Resistor while in the edit box you see the
name of our previous file, cvreference.sin, including its own path which could be
different in your case.
188 13 MEASURING IMPEDANCE AND T&S PARAMETERS