Chroma:
Chroma standard: PAL, B, G, H, I and D, or NTSC M (fixed for each instrument; not
switchable)
Sub-carrier frequency: 4.433 619 MHz for standard B, G, H, I
3.579 545MHz for standard M NTSC
Synchronization:
Line frequency: 15 625 Hz for CCIR, 15 734 Hz for RTMA
Number of lines: 625 for CCIR, 525 for RTMA
Field frequency: 50Hz for CCIR, 60Hz for RTMA |
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Video Pattern Generator
Patterns
and Applications
- Circle - linearity and geometry
- Center cross/Border lines - centering and pin-cushion correction
- White - "White D", purity and beam current adjustment
- Dot pattern - static convergence
- Cross hatch/Center indication - dynamic and corner convergence centering
- Chequerboard pattern - useful for basic alignments
- Grey scale (8 step) - video amplifier linearity
- Multiburst (8 bars of definition lines) - video bandwidth and resolution
- VCR - specially designed for checking bandwidth, linearity, sensitivity and AGC
of chroma amplifiers in VCRs.
- Color bar - overall color performance checks
- DEM pattern - color demodulator and sub-carrier frequency checks
- Purity (3 primary colors and combinations) - purity checks
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