CLIOwin 7 PCI User's Manual - Audiomatica

4.8.2 CONNECTING A MICROPHONE
For acoustical measurements, the microphone (optionally followed by a preamplifier
or power supply) requires to be connected to CLIO's input channel.
When using a MIC-01 or MIC-02 microphone it is possible to connect it directly to CLIO's
input; remember, in this case, to switch the phantom voltage on by pressing the
phantom button . It is good practice to wait a few seconds before taking measurements
as the microphone's output stabilizes.
If the measuring point is far from the PC, always lengthen the connection between the
preamplifier and CLIO. Make sure that you never use microphone cable that is longer
than the one that has been supplied.
In Fig. 4.27 we see the typical test setup for performing acoustical measurements of
a loudspeaker. Please note that in this schematic diagram, which is drawn in the
assumption of using one Audiomatica microphone MIC-01 or 02 directly connected to
CLIO input; the output of the power amplifier is connected to the loudspeaker with an
inversion in the cables polarity; this compensates the fact that MIC-01 and MIC-02
microphones are phase inverting (as are the vast majority of measuring microphones
found in the market); when making polarity measurements always treat the
measuring chain in this respect considering that the CLIO hardware itself is NON-
INVERTING and that all calibrations are usually made under this assumption: any
external device like amplifiers, microphones, accelerometers, preamplifiers etc. has to
be carefully checked.
It is possible to achieve the same result, via software, simply clicking on the input
polarity button in the hardware controls toolbar.
CLIO
INPUT (A OR B)
OUTPUT (A OR B)
MIC-01 OR MIC-02
BLACK
RED
RED
BLACK
POWER AMPLIFIER
Figure 4.27
Chapter 4 - CLIOwin basics 53