Method of and system for visually displaying several periodically reproducible input signals

US4020392A · kind A · utility

Assignee

• Wandel & Goltermann GmbH & Co. · DE

Inventors

• Peter Harzer · Eningen unter Achalm, DE
• Hans W. Funk · Hirschberg, DE

Key dates

• Filing date: Jun 24, 1976
• Grant date: Apr 26, 1977
• Expiry date: Jun 24, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R13/28
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Two (or more) periodically reproducible input signals V.sub.yI, V.sub.yII, possibly including a constant reference signal, are visually displayed on an oscilloscope screen with the aid of a normally suppressed electron beam under the control of a horizontal-sweep generator and a vertical-sweep generator producing a sinusoidal x-deflection and y-deflection signals V.sub.xR and V.sub.yR, respectively. The x-deflection signal V.sub.xR is continuously compared with two (or more) ramp signals V.sub.xI and V.sub.xII, of different periodicities substantially lower than the frequencies of the deflection signals, respectively assigned to the input signals V.sub.yI, V.sub.yII to be displayed; upon the occurrence of a coincidence with one of these ramp signals, the horizontal sweep is halted or slowed down -- preferably to the slope of the coincident ramp signal -- for a display interval equaling one cycle of the y-deflection signal V.sub.yR which at some point during this interval matches the corresponding input signal. At that point the beam is turned on to illuminate the screen for the remainder of the display interval, thereby tracing a short section of the input signal concerned.