Browse Prior Art Database

Oscillograph

IP.com Disclosure Number: IPCOM000090955D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

East Herman, PA: AUTHOR [+2]

Abstract

This direct writing oscillograph monitors power systems to record low frequency transients or power disturbances. Recording takes place on the surface of continuously rotating drum 16 around which a single strip of photosensitive paper 28 is wrapped. The paper is held in place by vacuum applied to ports 32, 34, and 36.

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Oscillograph

This direct writing oscillograph monitors power systems to record low frequency transients or power disturbances. Recording takes place on the surface of continuously rotating drum 16 around which a single strip of photosensitive paper 28 is wrapped. The paper is held in place by vacuum applied to ports 32, 34, and 36.

When a transient signal is detected by probe 90, it is transmitted via an attenuator to galvanometer 70. Initially, the latter is not transmitting light to paper 28 as lamp 74 is not energized. Upon detection of a transient, trigger circuit 94 provides a trigger pulse to pulse generator 98 causing rapid energization of lamp
74. The light pulse emitted by lamp 74 is of a duration sufficient for one revolution of drum 16. Radiant energy from lamp 74 is concentrated into ray 72 which is reflected by galvanometer 70 via mirror 82 and lens 84 onto paper 28. A photocell circuit, also energized by lamp 74, controls logic to apply pressure to the evacuated inside of drum 16. Simultaneously, gate 109 of hopper 26 is opened and paper 28 is discharged from drum 16 by stripper 150. The recorded piece of paper is now ready for evaluation.

By the same photocell controlled logic, motor 50 is energized to feed a preselected length of paper 14 from the supply roll into chute 52 to position 110 adjacent drum 16. Cutter knife assembly 68 cuts the required length of paper. Drum 16 meanwhile is switched back from pressure to vacuum and draws the new sheet...