CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

9.6 TIME DATA DISPLAY (OSCILLOSCOPE)
The time data (Fig. 9.7) is an ancillary display to an FFT or RTA executed measurement.
Here we see a 100Hz sinusoid captured and analyzed with a 16K FFT.
Figure 9.7
The time data display has a number of particular features that allow, out of user
control, for automatic scale adjustment and triggering of the displayed signal.
The time information displayed are the processed data only. The user can zoom in and
out these data but it is not possible to display more than one acquisition area. Fig. 9.8
shows this effect; the same 100Hz sinusoid as before seems now truncated; this means
only that we reached the maximum displayable data, in case of a 16K FFT @ 51200Hz
sampling this is exactly 320ms.
9.7 FFT AND MULTI-METER
Figure 9.8
There is a close interaction between FFT and Multi-meter operations. The two
measurements share the same acquisition and processing core. Should they operate
together the FFT control panel acts as master while Multi-meter follows as slave. In
this situation, among other peculiarities, the Go and Stop buttons of the Multi-meter are
disabled; if an FFT acquisition is started then the Multi-meter runs as well, the same
when you stop the measurement. More on this in section 7.6.
84 Chapter 9 - FFT