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| 4
'
1.4. PATTERN SURVEY
15
Signal content
B/W
Colour
VCR _ For checking
Checkerboard
6x8 rows
e
s
Focus adjustment
e
a
HOR/Vert. syne
e
=
HOR/Vert. linearity
e
a
HOR/Vert. deflection
e
Lt
Amplitude/aspect ratio, geometry ringing
e
a
Bandwidth by observation of vert. transitions
e
.
Mains Hum interference in synchronisation
fo)
Black/white transitions
Circle
e
a
Overal! linearity
bd
.
Overall geometry
Crosshatch
11 horizontal and
a
Dynamic convergence
15 vertical lines
e
2
Pincushion correction
.
E/W - N/S corrections in 1109 CTV receivers
Dots
11 horizontal lines
2
Static convergency
of 15 dots
Grey Scale
a
Brightness and contrast circuit
Staircase signal with
e
.
Grey scale tracking
8 identical steps
e
.
fo)
Linearity of video amplifier
combined with
Definition lines
e
.
fo)
Video Bandwidth
1-5 MHz
Red pattern
.
Purity
red signal with 50 % saturation
e
a
Interference between sound and chroma-carrier
re)
Colour A.G.C.
fo)
Chrominance writing currents of video head
White pattern
e
White —D
100 % white signal
a
Constant brightness
(with burst)
s
Beam current of picture tube
fo)
Luminance writing current
Special Bar pattern
s
PAL Delay-line; amplitude + phase
a
Demodulators; subcarrier frequency hase)
to (R—Y) — (B—Y) demodulators
4 vertical Bars.
a
PAL Switch
Special encoding
Colour Bar with white pattern
a
Overall colour performance
.
Burst keying
75 % contrast standard
s
Subcarrier regenerator
colourbar with white
s
PAL identification circuit
reference field in lower
.
Matrix circuit
part of screen
=
RGB amplifiers
fe)
Delay Colour versus B/W signal
fe)
Saturation check
fo)
562.5 kHz interference check
Saturation Step
s
°
Linearity of chroma amplifiers
Signal
2
fe)
Sensitivity colour amplifiers
8 steps of linear
increasing saturation
(red signal) combined with
Colour Definition Lines
2
°
Resolution of the chroma part.
120 kHz - 1 MHz
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