d. The most useful function of the sweep marker generator is to test and
adjust the bandpass of camera preamplifiers. The equipment layout used to check a
camera preamplifier with a sweep marker generator is shown in Figure 3-24. Figure
3-25 shows the output pattern of a properly tuned camera preamplifier as seen on
the scope.
Notice the notches inserted in the output.
These markers help you
observe the range of frequency response of the output pattern from the camera
preamplifier. These marks are important because the frequency response curve must
be flat to 8 MHz for adequate bandpass of the television video information.
Figure 3-24.
Camera amplifier bandpass check
73
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