B&K Precision 1249B - Manual - Manual (Page 32)

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APPLICATIONS (CONT.)
d. The display shape depends upon the chroma bandpass,
demodulator alignment, and design of the TV chassis.
The better the alignment and bandwidth, the closer the
vector waveform will be to the ideal waveform.
e.
Display shape will vary depending upon whether TV
chassis uses 90° or 105° angle of demodulation.
7. The vectorscope pattern can be a valuable tool for
troubleshooting color problems, including improper
alignment and adjustment, if the normal vectorscope
pattern is known. However, since normal patterns vary
considerably from one TV to another, a library of normal
displays measured from various popular TV chassis in
good working condition is desirable for reference.
Fig. 5. Using a Conventional Oscilloscope
as a Vectorscope, step 1 (set-up).
Fig. 6. Using a Conventional Oscilloscope as a Vectorscope,
step 2 (set-up).