Basic Measurements
1760 SeriesComponent Waveform/Vector Monitor User Manu al
4-12
PAL
The 1761 uses a series of dots around the com pass rose with
a single dot in a blanked area to denote sync (see Figure 4-8).
Place the burstvector at 0°, align the burst vectors with the
graticule markings, and read the SC/H phase error as the
amount of sync dot offset from the the horizontal axis. The
input signal and the the EXT REF signal are properly color
framed when the sync dot is within 90°of the burst vector.
VECTOR PHASE
Figure 4-8. PALSC/H display.
SC /H R --- Y
SC/H phase can be viewed over a frame of video. Select
WAVEFORMdispla y and FIELD sweep. Enter the FILTER menu
and select SC / H R --- Y. For NTSC, stable SC/H is a horizontal
line as shown in Figure 4-10. (Figure 4-9 shows the same
display witha LINE sweep selected.) A sample SC/H phase
error is shown in Figure 4-11. The fla t lines indicate that
SC/H phaseis stable over the entire frame. For PAL,SC/H is
a sine waveresulting from the 25 Hz offset (Figure4-12).