User`s manual

To verify the calibration first check that the generator output level is set to 0dBV
(refer to 4.5.3 for details).
Press the channel A In-Out Loop button .
Then click on the MLS button to invoke the MLS control panel. Press the Go
button to execute an MLS frequency response measurement; after about 1 second
you should obtain the desired result, a straight line (black) as in Fig.3.29. You can
click on the graph and inspect the amplitude of the measured signal: you should
obtain a reading around -3dBV, this is the correct output level of the MLS signal
with the generator output set to 0dBV.
Now click on the Sinusoidal button to invoke the Sinusoidal control panel as in
Fig.3.29. Press the Go button to execute a Sinusoidal frequency response
measurement; after about 5 seconds you should obtain the desired result, again a
straight line (black) as in Fig.3.29. You can click on the graph and inspect the
amplitude of the measured signal: you should obtain a reading around 0dBV.
To ensure a 100% correct calibration you also need to inspect the phase responses
of both measurements. To do this press the phase button and verify that you
obtain a straight line (red curves in Fig.3.29) the readings in this case should be
around zero degrees in both cases.
As a final test repeat the 1kHz tone test described in 3.6.1. The expected result is
shown in Fig.3.30.
Figure 3.30
3 CLIO INSTALLATION 33