Dorrough VLM-40 NTSC Manuel d'instructions

COMPOSITE VIDEO LUMINANCE METERMODEL VLM-40-48-4002040608010012 0© 1990SYNCLUMINANCEIREUNITS-32SYNC SETUPCOMPOSITE VIDEO LUMINANCE METERMODEL VLM-40

Reading The VLM-40 – 9AVERAGE LUMINANCE...PEAK LUMINANCE...VLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONAverage luminance is displayed as a contin

10 – How To Read The VLM-40/ExamplesVLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONSETUP LEVEL...The setup LED is a two-way indicator of setup level

Examples – 11VLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONThe following examples illustrate how you can use the VLM-40to identify common problems

12 – ExamplesVLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONSETUP LEVEL VIOLATIONEXCESSIVE PEAK LUMINANCECOMPOSITE VIDEO LUMINANCE METERMODEL VLM-40

Examples – 13VLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONPOOR CONTRASTCOMPOSITE VIDEO LUMINANCE METERMODEL VLM-40-48-4002040608010012 0© 1990SYN

14 – CalibrationVLM-40 NTSC TECHNICAL INSTRUCTION MANUALCALIBRATIONNTSC CALIBRATION...The VLM-40 has been carefully calibrated for NTSC operationat th

Calibration – 15Fig. 17. This simplified circuitboard diagram shows keycomponents used to calibrate theVLM-40 for NTSC operation.VLM-40 NTSC TECHNICAL

Introduction – 1EASY-TO-USEVIDEO LEVEL METER...SIMULTANEOUS DISPLAY...PEAK AND AVERAGE...SPECIFICATIONS...The DORROUGH Composite Video Luminance Meter

2 – DescriptionThe VLM-40 features a single 40-segment bar graph, as shownin Fig. 1. Peak and average luminance are simultaneouslydisplayed on 30 LED

Description – 3REAR PANEL CONNECTIONS..Fig. 2. The VLM-40’s rear panelprovides video connections and atermination switch for 75 ohms orloop connection

4 – InstallationVLM-40 NTSC TECHNICAL INSTRUCTION MANUALINSTALLATIONUNPACKING...INITIAL SET-UP...Fig. 3. Dimensions for mounting a VLM-40 in an option

Installation – 5Fig. 4.VLM-40 display for standardEIA (split-field) color bar signalwith standard setup at 140 IRE (1 V p-p).VLM-40 NTSC TECHNICAL INS

6 – NTSC Composite Video SignalVLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONCOMPONENTS OF THENTSC COMPOSITEVIDEO SIGNAL...Fig. 5. The NTSC Composi

Reading The VLM-40 – 7Fig.6. A single horizontal scan line(75% full-field color bar signal) asseen on a waveform monitor.HOW TO READTHE VLM-40...VLM-4

8 – Reading The VLM-40SYNC LEVELS...VLM-40 NTSC TECHNICAL INSTRUCTION MANUALOPERATIONSync level is displayed (left corner of VLM-40) as a single litgr