Extron Electronics VSC 900_900D User Guide - Manual (Page 16)

Installation and Operation, cont’d
VSC 900/900D • Installation and Operation 2-8
With this method there is no way to know if the signals are 180º out of phase. A
delayed sweep on a time-based scope would allow a more accurate display of the
input and output signal phase relationships.
A vectorscope is more accurate than a waveform monitor. The following diagram
shows an example of a vectorscope display when the horizontal phase is
adjusted to align it with the burst (genlock) vector. Adjust the horizontal phase
by rotating the Adjust horizontal (
) knob until the difference between the two
vectors is 0º. This example shows black burst only (with no color). The burst
vector is pointing to the left from the center.
0 10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170 180 190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
Figure 2-5 — Vectorscope screen during horizontal phase
adjustment
The following diagram shows an example of a view of a vectorscope during
adjustment of the color subcarrier phase (SC/H). The subcarrier phase should be
aligned to 0º (indicated in the figure by the triangle).
0 10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170 180 190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
+40
-40
A1
A2
A3
B1
B2
B3
Figure 2-6 — Vectorscope screen during color subcarrier phase
adjustment