Graphical Display Of Audio Auto Test Signals; Figure 2-11: Typical View Audio Auto Test Graph Phase Display Showing Upper And - Tektronix VM700T User Manual

Graphical Display of
Audio Auto Test Signals
VM700T Option 40/41/42 Audio Measurements User Manual
You can display graphs of the left and right channel frequency sweeps showing
differential gain and differential phase over the frequency sweep, the THD + N
of each channel (for those test sequences having a THD + N sweep signal) and
Crosstalk between channels (again only for those test sequences have a crosstalk
sweep test). A typical View Audio Auto Test screen (see Figure 2–11) graphs the
signal phase and frequency for left and right audio channels. (In Option 41, it is
the left and right channels associated with the selected video channel, A, B,
or C.) The soft key menu choices determine the type of display shown.
The upper and lower test limits are shown in the View Audio Auto Test graphic
displays as lighter lines above and below the received signal (see Figure 2–11 for
a sample display). As described earlier, these limits are set either at configuration
(for O.33 Recommendation sequences) or are contained in the received
sequence's preamble (in Tek sequences). The default lower test limit is a mirror
of the upper test limits. You may configure the elements of the View Audio Auto
Test function in the VM700T Configure Files directory. For information on
configuring View Audio Auto Test, refer to Configuring the Audio Option
beginning on page 1–1.
Figure 2–11: Typical View Audio Auto Test graph phase display showing upper and
lower test limits (faint lines)
Operating Basics
2–19