Spectrum Analyzer Menus
2715 User Manual
6–87
9. Call up the SETUP TABLE again and choose item 1, KNOB SELEC-
TABLE.
10. Return to the spectral display.
The tuning knob now controls which pulse is used.
Pulses are numbered from 1 to 1023. The current line number (horizontal video
line number and sync pulse number are the same) is displayed at the bottom of
the right on-screen column. If more than one sync pulse is displayed, the number
is that of the pulse nearest the left edge of the screen.
Turning the knob clockwise increases the line number and counter-clockwise
decreases it.
11. Turn to about line 17 to view several lines including the vertical interval test
signal (VITS).
This signal is usually present between lines 15–20 in the U.S. (see Figure 6–17).
The display is not as bright as it was in the CONTINUOUS mode, because
the 2715 is triggering on, and displaying, only one horizontal line out of
every 525. If the display is too dim, adjust the INTENSITY control.
Figure 6–17: Video Signal Using Knob-Selectable Horizontal Line Triggering
(VITS Visible)
When knob-selectable TV line triggering is active, pressing [MKR/FREQ] [2]
allows the knob function to be changed from frequency control to marker control
or video line selection. This is a great convenience if you want to change TV
channels. See Changing the Knob Function on page 6–19 for more information.
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