Browse Prior Art Database

Display of Instantaneous and Transient Power Dissipation

IP.com Disclosure Number: IPCOM000093593D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Imredy, JB: AUTHOR

Abstract

This method displays instantaneous and transient power dissipation on a cathode ray tube. The method utilizes the instantaneous voltage and current signals of the device to be measured as inputs to the display. A signal, proportional to the instantaneous current of the device to be measured, controls the voltage on vertical deflection plates 11 of CRT device 13. A signal proportional to the instantaneous voltage of the device to be measured controls the voltage on horizontal deflection plates 15. The instantaneous position of the beam of CRT 13 is thus dependent upon the instantaneous value of the voltage and upon the instantaneous value of the current of the device to be measured.

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Display of Instantaneous and Transient Power Dissipation

This method displays instantaneous and transient power dissipation on a cathode ray tube. The method utilizes the instantaneous voltage and current signals of the device to be measured as inputs to the display. A signal, proportional to the instantaneous current of the device to be measured, controls the voltage on vertical deflection plates 11 of CRT device 13. A signal proportional to the instantaneous voltage of the device to be measured controls the voltage on horizontal deflection plates 15. The instantaneous position of the beam of CRT 13 is thus dependent upon the instantaneous value of the voltage and upon the instantaneous value of the current of the device to be measured.

Graticule 17 having constant power dissipation lines 19 etched on it can be superimposed over the CRT display and indicate in easily readable form, the actual instantaneous power dissipation. The constant power dissipation lines are in the form of an algebraic function P=(V)(I)=K, a constant. This results in a hyperbolia with the x and y axes representing the asymptotes of the hyperbola.

Beam intensity modulation effected by a constant frequency I/T signal applied to the grid 21 of CRT 13 can be utilized to put time marks on the display. Thus, the instantaneous power of signal 23 can be readily observed with respect to the constant power dissipation lines 19 on graticule 17. Signal 23 appears as a broken line since the signal is...