BK Precision 1253 Operator's Manual
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BK Precision 1253 Operator's Manual

BK Precision 1253 Operator's Manual

Hdtv multi-standard pattern generator
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Model 1253
HDTV Multi-Standard Pattern Generator
Operator's Manual
Version 3.00

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Summary of Contents for BK Precision 1253

  • Page 1 Model 1253 HDTV Multi-Standard Pattern Generator Operator's Manual Version 3.00...

  • Page 2: Table Of Contents

    Warranty Information ___________________________________________________________ 35 Service Information ____________________________________________________________ 36 * Patterns printed in the manual included with each 1253 is in black in white. To view the manual in color and to take advantage of the examples given please visit www.bkprecision.com and download the 1253 manual.

  • Page 3: Introduction

    HDTV test-pattern-generators sell for several thousands of dollars. This is prohibitively expensive for many of the people getting into HDTV, such as the TV repair shop. So, at BK Precision we recognize the need for a reliable, accurate, and high quality HDTV test-pattern-generator.

  • Page 4: Operation

    OPERATION: The POWER Switch This Power Switch, on the right side of the unit, turns the power to the unit on and off. Slide the switch the upward position to turn the unit on. The red POWER LED will be on. Slide the switch the downward position to turn the unit off.
  • Page 5 The PATTERN Buttons These 14 buttons may be pressed at any time, to select the Pattern displayed as an icon on the button. Some Pattern buttons may be pressed multiple times, to display variations of that particular pattern. SMPTE Bars 75% (default on power-up) PLUGE Needle...

  • Page 6: Connecting The Unit

    Connecting the unit There are 3 BNC connectors on the top of the unit, labeled Y, Pb and Pr. These are HDTV-Component video connections to be connected to the Y, Pb and Pr connectors of a HDTV monitor or TV with component video input. There is also a DIN connector, labeled S-VID. This is a S-Video (S-VHS) video connector to be connected to a TV with a S-VID input.

  • Page 7: Patterns

    Patterns 1: SMPTE Bars (Society of Motion Pictures and Television Engineers) Description: 7 equal width vertical bars in 3 groups. The top 2/3 of the pattern contains White (R+G+B), Yellow (R+G), Cyan (G+B), Green (G), Magenta (R+B), Red (R), and Blue (B) bars, from left to right, at 75% (100% saturation).
  • Page 8 There are various other applications for SMPTE Bars. It has value in VTR testing and in quick checks of the system phasing thru monitors and Vectorscopes. Vectorscope Display of SMPTE Bars SMPTE Bars are also often used for Tape Headers, or sometimes between edit cuts. Also often used for testing transmission equipment.

  • Page 9: 2: Pluge Pattern

    2: PLUGE (Picture Line Up Generator Equipment) Description: The Pluge pattern (Picture Line-Up Generator Equipment – BBC development) is arranged in four concentric rectangular zones. The innermost rectangle is fixed at black (7.5 IRE for NTSC, 0 IRE for other formats) and has a five-step gray scale positioned on it. The second rectangular zone from the center alternates between two light levels, black and slightly blacker than black (7.5/0 IRE for NTSC, 0/-5 IRE for other formats).

  • Page 10: 3: Needle Pattern

    3: Needle Description: This pattern is black on the top half and white on bottom half, with lines (needle pulses) drawn from top to bottom on each side of the pattern, through the black/white transition. Electrically, the needle pulse lines are the same width on the top and the bottom of the pattern. Pattern Usage: This pattern makes it easy to detect whether scan velocity modulation (SVM) is enabled on a display device.

  • Page 11: 4: Color Bars Pattern

    4: Color Bars Color Bars 75% Same as the top of the SMPTE Bars Pattern Description: Seven equal-width vertical bars with 75% (gray) at left, followed by three primary and three secondary colors. Color bars are at 100% saturation with 75% amplitude. Pattern Usage: Use as an overall check of a display device’s capability of producing fully saturated primary and secondary colors.

  • Page 12: 5: Cross Hatch Pattern

    5: Cross Hatch Description: A grid of 16 x 9 boxes, separated by white lines. Pattern Usage: Used to check and adjust convergence of red, green and blue pictures. The horizontal and vertical lines are usually best observed to detect color fringing resulting from misconvergence, and the dots are usually best observed to make fine adjustments.

  • Page 13: 6: Dvd Aspect Ratio Patterns

    6: DVD Aspect Ratio Description: Grayscale rectangles occupying a user selected aspect ratio, on top of a black background. The outer rectangle is at 75% gray, with an inner rectangle at 50% (mid) gray. The border of the outer rectangle occupies 10% of the width and height of the rectangles. Through the center of this border is a black line at 5%.
  • Page 14 DVD Aspect Ratios as seen on TVs and Monitors These images show how different aspect ratios will appear on SDTV (4:3) and HDTV (16:9) monitors. SDTV 4:3 Monitor HDTV 16:9 Monitor Aspect Ratio: 1.33 : 1 1.78 : 1 1.85 : 1 2.35 : 1...

  • Page 15: 7: Raster Patterns

    7: Raster Description: Full field color raster patterns at 75% amplitude. Variations: Pressing The Raster button multiple times, sequences the full-screen output through 8 colors, at 75% amplitude: White, Yellow, Cyan, Green, Magenta, Red, Blue, and Black. Pattern Usage: Use to check color purity and display chrominance uniformity. Color purity problems are usually caused by slight magnetization of some part of a CRT display device, often metallic CRT mounting brackets or the metallic CRT shadow mask, located just behind the phosphor screen in a direct- view CRT.

  • Page 16: 8: Multiburst Pattern

    8: Multiburst Description: Consists of 6 frequency bands increasing in frequency, from left to right, and separated by gaps of mid gray. Vertical segments are filled with alternating black and white stripes. The frequencies are at 1.125MHz, 2.25MHz, 3.375MHz, 4.5MHz, 6.75MHz and 13.5MHz for the HDTV formats, and 0.75MHz, 1.125MHz, 2.25MHz, 3.375MHz, 4.5MHz and 6.75MHz for the SDTV formats.

  • Page 17: 9: Focus Pattern

    9: Focus Description: Consists of capital letter “B”s and “K”s alternating across the screen. The closely spaced elements of these letters make it easy to judge the effects of focus adjustments. Pattern Usage: Used as a reference signal for viewing the effects of focus adjustments across the entire screen.

  • Page 18: 10: Staircase Pattern

    10: Staircase Description: 11 equal-width vertical bars step from black at 0 IRE (7.5 IRE for NTSC) on the left, to 100 IRE (white) on the right. Pattern Usage: Useful for visually checking gray-scale tracking performance of a display. Poor performance is seen as a primary color tint (red, green, or blue), especially at the bright or dark end of the pattern.

  • Page 19: 11: Ansi Gray Pattern

    11: ANSI Gray Description: Pattern is an all white raster with two centered three-step gray scales. The top gray scale steps are at 10%, 5%, and 0% white levels. The bottom gray scale steps are at 90%, 95%, and 100% white levels (from left to right).

  • Page 20: 12: Window Patterns

    12: Window This PLUGE Bar is the only bar which should be visible Description: Centered 1/3 white window on black background. Luminance levels of Window are independently adjustable from 0 IRE to 100 IRE in 2.5 IRE steps. The window pattern includes PLUGE level bars at +5% and –5% of black to the left of the white window.

  • Page 21: 13: Checker Pattern

    13: Checker Description: Alternating picture areas of black and white in a checkerboard pattern. Pattern Usage: Checks the regulation of CRT video drive power supply circuits. The pattern produces abrupt, maximum changes in CRT video drive current. Ideally, this should not cause the voltage supplied to the video drive circuits to change (good voltage regulation).

  • Page 22: 14: Overscan-Bounce Pattern

    14: Overscan-Bounce (Regulate) Description: Sometimes called "Regulate", this pattern consists or 4 horizontal and vertical lines at the edges of the screen, marking 2.5%, 5%, 7.5% and 10% of the width and height of the screen. The center of the screen flashes between full white and black every 1 1/3 seconds. Pattern Usage: Used to test the amount of overscan of a monitor (usually a CRT type), and to check the regulation of a CRT monitor's high-voltage and deflection power supply circuits.

  • Page 23: Specifications

    Specifications: Number of Video Formats 1: 1920x1080 30i 2: 1920x1080 30p 3: 1920x1080 24p 4: 1280x720 60p 5: 1280x720 30p 6: 1280x720 24p 7: 704x480 60p 8: 704x480 30p 9: 704x480 30i 10: NTSC 11: PAL 12: SECAM Number of Patterns 1: SMPTE Bars 75% 2: PLUGE 3: Needle...
  • Page 24 (APL) of the incoming video changes. Only the finest displays maintain a constant black-level with large changes in APL. In the majority of CRT-based displays the black-level adjustment must be a compromise over a range of APLs. The BK-1253 provides a Window pattern with PLUGE bars, so the APL may be altered to make the best setting.

  • Page 25: Calibrating A Hdtv Monitor

    The Black-level adjustment often interacts with the Contrast adjustment and will change during the Color Temperature and Grayscale Tracking adjustments. The BK-1253 provides unique calibration patterns to monitor and re-adjust black-level while making those adjustments.
  • Page 26 BK-1253 Contrast Adjustment Patterns: The BK-1253 has several patterns that can be used together to determine the best operating point for the Contrast control. These include the Window, Multiburst, PLUGE, Needle, Overscan-Bounce , and Grey Raster patterns.
  • Page 27 Short-term high-voltage stability problems may be evident on the inner horizontal staircase of the PLUGE pattern. Look for trapezoidal distortion of the lighter rectangles. The Needle Pulse pattern is a more sensitive indicator of short-term stability problems. The upper half of the pattern is black with narrow white vertical lines on both sides.
  • Page 28 Cross Hatch Overscan-Bounce The BK-1253 includes a 16:9 Crosshatch with vertical and horizontal white lines against a black background. The 16 x 9 grid pattern produces square cells on a HDTV monitor for easy adjustment or measurement of horizontal and vertical linearity.
  • Page 29 LCD and DLP projectors because their convergence is mechanical in nature and should have been permanently adjusted at the factory. BK-1253 Convergence Adjustment Patterns: The 16:9 Crosshatch pattern is the ideal pattern for adjusting convergence. Each of the three primary colors should overlap the others without color fringing.
  • Page 30 Gain controls are changed (particularly the green gain). BK-1253 Grayscale Calibration Patterns: The BK-1253 includes a Window patterns that consist of a gray rectangle adjustable between 0 and 100 IRE against a black background. This ranging is convenient to use for adjusting the grayscale color-temperature controls.
  • Page 31 A good initial procedure is to adjust the Bias controls for D65 using the 25 IRE Grayscale Window pattern and then adjust the Gain controls for D65 using the 75 IRE Grayscale Window. The adjustments will interact and it will be necessary to move back and forth between the calibration patterns several times before both patterns can be set to D65.
  • Page 32 BK-1253 Color Saturation & Hue Calibration Patterns: The BK-1253 provides 75% SMPTE Bars and Color Bars to visually adjust color saturation and hue. The Color Flat Fields can be used to adjust color saturation and hue, or to measure color accuracy using a color analyzer.
  • Page 33 If the display includes Sharpness or Detail Enhancement controls they should be calibrated to maximize apparent picture resolution, but avoid any excessive edge-enhancement that creates outlining artifacts. BK-1253 Sharpness/Detail Enhancement Calibration Patterns: Sharpness/Detail Enhancement Adjustment Procedure: Initially adjust Sharpness or Detail Enhancement controls such that each of the black and white line bursts (except the last burst) in Multiburst pattern appear to have the same black/white contrast ratio.
  • Page 34 8. Other Performance Checks A Checkerboard pattern with black and white squares is included for measuring the amount of light leakage in the black areas of the picture. There are 36 rectangular (16:9 or 4:3) blocks in a 6x6 pattern. The black blocks are at 0 IRE (7.5 IRE for NTSC) and the white blocks are at 100 IRE.
  • Page 35 Limited One-Year Warranty B&K Precision Corp. warrants to the original purchaser that its product and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from the data of purchase. B&K Precision Corp. will, without charge, repair or replace, at its’ option, defective product or component parts.

  • Page 36: Warranty Information

    Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the below address.
  • Page 37 22820 Savi Ranch Parkway Yorba Linda, CA 92887 SN: 481-419-9-001 Printed in USA TEL: 714-921-9095  2003 B&K Precision Corporation FAX: 714-921-6422...

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