Title:
LAMP TESTING CIRCUIT
Document Type and Number:
Japanese Patent JPS5397273
Kind Code:
A
Abstract:
PURPOSE: To detect and indicate malfunctioning of lamps, by taking out signals corresponding to voltage drop caused at the time when lamps are lighted and dark current caused at the time when the lamps are turned off, while carrying out testing of all the lamps in a short period of time, and making exclusive logical sum, i.e., "Or" else of these signals.
Inventors:
TAKASHIMA HAJIME
Application Number:
JP1070077A
Publication Date:
August 25, 1978
Filing Date:
February 04, 1977
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H05B37/03; (IPC1-7): H05B37/03