Tektronix 1720 User Manual

Operating Instructions
2–18
1720/1721
0°
10°
df
10°
20%
dG
YL
10%
dG
yl
75% 100%
100%
75%
WITHOUT
SETUP
WITH
SETUP
Figure 2-11: Partial 1720 graticule showing the 75% amplitude burst target, with and
without setup compensation.
Encoding.
The hue and color amplitude information in the color television
system is carried on a single subcarrier frequency: 3.579545 MHz for NTSC and
4.43361875 MHz for PAL. These signals, in modulated subcarrier form, are
called chrominance. The hue information is carried by the subcarrier phase; the
color amplitude information is carried by means of amplitude modulation with
the subcarrier suppressed. A subcarrier which supplies phase information is
required for demodulation. No picture chrominance signals are present during
the horizontal blanking interval
and a sample of the subcarrier, used by decoders
for a reference (called burst), is provided within this interval.
0°
10°
df
10°
20%
dG
YL
10%
dG
yl
75% 100%
100%
75%
75% AMPLITUDE
BURST TARGETS
Figure 2-12: Partial 1721 graticule showing the 75% amplitude burst target.

Tektronix 1720 Specifications

General

Brand	Tektronix
Model	1720
Category	Measuring Instruments
Language	English