G - Physics – 01 – R
Patent
G - Physics
01
R
324/58
G01R 31/02 (2006.01) G01R 31/08 (2006.01) G01R 31/44 (2006.01)
Patent
CA 1038041
ABSTRACT OF THE DISCLOSURE An improved indicator lamp circuit is provided which gives positive protection against feedback of power during testing. The indicator lamp circuit provided has a disconnecting device which operates upon failure of the isolating components between the test and signal circuits. In the disclosed indicator lamp circuit each indicator lamp is directly connected to the low voltage side of an indicator transformer. A test circuit and a normal signal indicator circuit are connected to one leg of the primary high voltage side of the indicator transformer. The other leg of the indicator transformer is connected to a common line utilized by the test and indicator signal circuit. A transformer diode is connected across the primary high voltage side of the indicator transformer. Isolating elements are provided for isolating the test and indicator signal circuits. A disconnecting element is disclosed in series with the isolating elements and is activated by current flow through the trans- former diode. Thus, if an isolating element fails, the dis- connecting element operates to disconnect the test circuit and the indicator signal circuit. -1-
241045
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