The Effect of CRT Bias on Visibility of Targets on a Remote PPI

Abstract

The cathode ray tube of a VD remote PPI indicator has an optimal bias level with respect to target visibility. Every experiment in which CRT bias was varied yielded a curve of visibility with a maximum lying somewhere between the lowest and highest intensity (CRT bias) settings. In all cases maximum visibility was obtained with a moderately bright, light yellow background, that is, with a comparatively low bias, and not with the dark or high bias background frequently employed by trained operators. The exact specification of this optimal level in volts or in units of illumination is not yet possible with existing measuring instruments. However, it can be fairly well defined visually.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 10, 1946
Accession Number
AD0639371

Entities

People

  • Ellwood King
  • S. B. Williams

Organizations

  • Johns Hopkins University

Tags

DTIC Thesaurus Topics

  • Applied Psychology
  • Bias
  • Brightness
  • Cathode Ray Tubes
  • Control Knobs
  • Detection
  • Electrical Engineering
  • Engineering
  • Frequency
  • Generators
  • Illumination
  • Measurement
  • Measuring Instruments
  • Observation
  • Observers
  • Universities
  • Voltmeters

Readers

  • Human-Computer Interaction (HCI).
  • Statistical inference.
  • Vision Science/Vision Psychology/Cognitive Neuroscience.