Testing emergency battery equipment
First Claim
1. Testing apparatus for testing stand-by battery powered lighting equipment which is adapted for energization in response to mains failure, the apparatus comprising an electrical circuit including a sensor means for sensing the visible light emitted by the stand-by equipment when activated, means for indicating when the light emitted is below a predetermined value, a timing circuit for disconnecting the mains supply from the stand-by equipment automatically at regular intervals and a power supply circuit connected to the timing circuit for energizing the sensor means when the timing circuit has disconnected the mains supply.
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Accused Products
Abstract
Stand-by battery equipment which is designed to come into use when the mains supply fails, is tested by disconnecting the mains supply at regular intervals by contact 14 under the control of timing device 21. After a delay caused by timing device 23, a light sensor 15 is activated for a time period controlled by timing device 24to check whether the light output of the battery equipment has reached a desired level, and if it has not it causes an alarm lamp 16 to be illuminated until reset. A timing device 22 causes an extra long test to be carried out after a number of short tests, to ensure that the battery equipment is operable for the long period and to allow the stand-by batteries to become appreciably discharged.
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Citations
6 Claims
- 1. Testing apparatus for testing stand-by battery powered lighting equipment which is adapted for energization in response to mains failure, the apparatus comprising an electrical circuit including a sensor means for sensing the visible light emitted by the stand-by equipment when activated, means for indicating when the light emitted is below a predetermined value, a timing circuit for disconnecting the mains supply from the stand-by equipment automatically at regular intervals and a power supply circuit connected to the timing circuit for energizing the sensor means when the timing circuit has disconnected the mains supply.
Specification