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Browse Prior Art Database

Flashover Testing of Cathode Ray Tube Devices

IP.com Disclosure Number: IPCOM000052796D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Ainscrow, F: AUTHOR [+3]

Abstract

Flashover internally of a cathode ray tube (CRT) is a major cause of failure in the associated external electronic circuits. The protection provided for these circuits must be tested under controlled conditions. Apparatus for flashover testing of CRT devices within their normal covers or external cabinets is described with reference to the figures. The apparatus consists of a modified CRT 1 and a ""spark-gap'' flash generator 2, as shown in Fig. 1. Tube 1 is modified by the provision of a heavily insulated conductor 3 from the anode contact 4 along the glass surface to the neck 5 of the tube 1. The flash generator 2 is clamped at the end of neck 5 and connected to the conductor 3.

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Flashover Testing of Cathode Ray Tube Devices

Flashover internally of a cathode ray tube (CRT) is a major cause of failure in the associated external electronic circuits. The protection provided for these circuits must be tested under controlled conditions. Apparatus for flashover testing of CRT devices within their normal covers or external cabinets is described with reference to the figures. The apparatus consists of a modified CRT 1 and a ""spark-gap'' flash generator 2, as shown in Fig. 1. Tube 1 is modified by the provision of a heavily insulated conductor 3 from the anode contact 4 along the glass surface to the neck 5 of the tube 1. The flash generator 2 is clamped at the end of neck 5 and connected to the conductor 3. The neck 5 of the tube projects beyond the flash generator 2 to allow the pins 6 of the CRT 1 to be connected to external circuits in the normal way. Tube 1 with flash generator 2 mounted on its neck is mounted inside the covers of the device so that testing can take place under normal operating conditions.

The detailed construction and operation of the flash generator 2 is described with reference to Fig. 2. The flash generator 2 has a pair of adjustable ""spark'' points 7 and 8. Spark point 7 is connected by an insulated conductor 9 to a selected pin of tube 1, as shown in Fig. 1. Spark point 8 is connected to conductor cable 3, as shown on the inset drawing. The spark points 7 and 8 are fixed in an insulating frame 10 having a central hol...