Measuring System Performance: CSO/CBT Measurements
129
6
After a brief interval, the screen shown in Fig. 6-12 appears, showing the
measurement traces.
Fig. 6-12 CSO/CTB, Carrier OFF
The light trace represents the carrier prior to its being turned off. The dark
trace represents the distortion products. The measurement value is
computed by the ratio of the peak level of the video carrier to the peak of the
distortion products of the second and third order beats. The worst case CSO
value is highlighted. This is the overall CSO value.
Notice that CSO and CTB ratios are about equal, and well above any
reasonable minimum.
Press the CSO/CTB Setup soft key to adjust the offset values
for the CSO measurement.
To Next Page
Loading...
