54200
Users Manual
4-62
VCR Test
The VCR test offers five different test patterns which
are specially designed to check the bandwidth,
linearity, sensitivity, and AGC of the chroma
amplifiers in color video recorders. These test patterns
are:
•
VCR 1
•
VCR 2
•
Standard Resolution Test
•
High Resolution Test
•
Writing Current Adjustment
•
Parameters are matched to 625 or 525 line
systems.
VCR 1
Figure 4-93. VCR 1
VCR 1
is a full field B/W pattern of three vertical bars
with color burst and a luminance of 0% respectively
100% (7.5/100 IRE).
Table 4-8. VCR 1
625
Line System
525
Line System
Position, horiz.
direction relative to
sync: start/width
•
Bar 1 10.5 / 13.0
µ
s 9.2 / 13.2
µ
s
•
Bar 2 23.6 / 19.5
µ
s 22.4 / 19.9
µ
s
•
Bar 3 43.0 / 19.5
µ
s 42.2 / 19.9
µ
s
Applications:
This pattern is used for a reflection check or for
adjusting the VCR video demodulator to a symmetrical
black-and-white jump or opposite.
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