Tektronix 1760 Manuel d'utilisateur télécharger pdf (Page 112)

Basic Measurements

1760 Series Component Waveform/Vector Monitor User Manual

4-12

PAL

The 1761 uses a series of dot s around the compass rose with

a single dot in a blanked area to denote sync (see Figure 4-8).

Place the burst vector 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 ve ctor.

VECTOR PHASE

Figure 4-8. PAL SC/H display.

S C / H R --- Y

SC/H phase can be viewed over a frame of video. Select

WAVEFORM display and FIELD sweep. E nter the FILTER menu

and select

S C / 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 with a

LINE sweep selected.) A sample SC/H phase

error is shown in Figure 4-11. The flat lines indicate that

SC/H phase is stable over the entire frame. For PAL, SC/H is

a sine wave resulting from the 25 Hz offset (Figure 4-12).

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Tektronix 1760 Manuel d'utilisateur Page 112