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US 4,553,091 AGranted
Automatic vertical calibration method and system for an oscilloscope
AssigneeTektronix, Inc.
InventorL. Rodney Bristol
Life of this patent
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Abstract
An oscilloscope vertical calibration system is provided in which gain control elements in one or more vertical input channels are automatically controlled with respect to cursor voltages applied to the vertical output amplifier. Such calibration process is performed for each deflection factor setting either manually or automatically and the correct gain control signals are stored in memory.
Claims13
A method of calibrating the vertical deflection system of an oscilloscope, comprising the steps of:
- (a) applying a standard amplitude signal to the input preamplifier of said oscilloscope;
- (b) measuring the amplitude of the standard signal after preamplification thereof at a preselected deflection factor setting of said preamplifier by detecting the peak-to-peak voltage of said preamplifier standard signal;
- (c) converting said detected peak-to-peak voltage to reference data corresponding to said measured amplitude and storing said reference data;
- (d) selecting by automatic means a new predetermined amplitude of said standard signal and a new predetermined deflection factor of said preamplifier;
- (e) measuring the amplitude of the standard signal after preamplification at the new settings and producing new reference data corresponding to the new measured amplitude value;
- (f) comparing the new reference data with the stored reference data and developing therefrom a gain control signal;
- and
- (g) applying the gain control signal to said preamplifier to control the gain thereof.
5 more elements
A system for calibrating the vertical deflection system of an oscilloscope, comprising:
- means for applying a standard-amplitude signal to the input preamplifier of said oscilloscope, said preamplifier having a plurality of selectable deflection factor settings and a controllable gain stage;
- means for measuring the amplitude of said standard signal after preamplification thereof at a first preselected deflection factor setting by detecting the peak-to-peak voltage of said preamplified standard signal;
- means for converting said detected peak-to-peak voltage to reference data corresponding to said measured amplitude and storing said reference data;
- means for automatically selecting a new deflection factor setting and a new predetermined amplitude of said standard signal, said measuring means measuring the new preamplified amplitude of the standard signal to provide new reference data corresponding to said new measured amplitude value;
- means for comparing the new reference data with the stored reference data and developing a gain control signal therefrom;
- and
- means for applying said gain control signal to said preamplifier to control the gain thereof.
4 more elements
An oscilloscope vertical calibration system, comprising:
- a vertical input amplifier including a gain control element and for amplifying a standard amplitude signal;
- first and second cursor generators to provide respective cursor voltages of a predetermined voltage difference therebetween;
- a vertical output amplifier for selectively amplifying the output from said vertical input amplifier and said cursor generators;
- comparison means for comparing the outputs of said standard amplitude signal and cursor voltages from said vertical output amplifier;
- and
- control means for controlling the gain control element in such a manner that said standard amplitude and cursor voltages are equal to each other.
3 more elements
Dependencies are inferred from the claim text.