CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

5.7.2 CONNECTING A MICROPHONE
For acoustical measurements, you will connect a microphone (optionally followed by
a preamplifier or power supply) 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 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. 5.23 we see the typical test setup for performing acoustical measurements of
a loudspeaker. Please note this schematic diagram, 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 cables
polarity; this compensates the fact that MIC-01 and MIC-02 microphones are
phase inverting (as almost the vast majority of measuring microphones found in the
market); when making polarity measurements always cure 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.
CLIO
INPUT (A OR B)
OUTPUT (A OR B)
MIC-01 OR MIC-02
BLACK
RED
RED
BLACK
POWER AMPLIFIER
Figure 5.23
54 Chapter 5 - CLIOwin basics