EP 0434859 B1 19930707 - DEVICE FOR CHECKING THE CORRECT WORKING OF AN INCANDESCENT LAMP
Title (en)
DEVICE FOR CHECKING THE CORRECT WORKING OF AN INCANDESCENT LAMP
Publication
Application
Priority
EP 89123950 A 19891227
Abstract (en)
[origin: EP0434859A1] The invention relates to a device for monitoring the serviceability of an incandescent lamp (1) connected to a power source (2) by means of leads (3,4), it being possible to check the continuity of the circuit at low power in the switched-off state, without any visible effect on the incandescent lamp (1), and/or by confirming an energy flow in the switched-on state. In order to be able to differentiate between circuit continuity resulting from a short-circuit or shunt circuit and the continuity of the circuit when the incandescent lamp is operated during such a test, and to exclude the possibility of a positive test result despite a defective incandescent lamp, the ratio of the resistance of the arrangement when the incandescent lamp (1) is in the switched-off state to the resistance of the arrangement when the incandescent lamp (1) is in the switched-on state is determined and is compared with the ratio of the cold-hot resistance which is applicable to the respective incandescent lamp (1) to be monitored, taking into account the lead conditions, to output a report for the monitoring result. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 37/03 (2006.01)
CPC (source: EP US)
H05B 47/20 (2020.01 - EP US)
Designated contracting state (EPC)
AT BE DE ES FR GB LU NL
DOCDB simple family (publication)
EP 0434859 A1 19910703; EP 0434859 B1 19930707; AT E91376 T1 19930715; DE 58904882 D1 19930812; ES 2042959 T3 19931216
DOCDB simple family (application)
EP 89123950 A 19891227; AT 89123950 T 19891227; DE 58904882 T 19891227; ES 89123950 T 19891227