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US 3,975,684 AGranted
Sweep generator apparatus and method
AssigneeHewlett-Packard Company
InventorWilliam J. Mordan
Life of this patent
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Abstract
An improved sweep circuit for an oscilloscope or the like has an adjustably delayed sweep which is time shared to display separate recurring events of interest alternately to provide an apparently simultaneous display of the events. The adjustable delay between sweeps may be directly indicated as a time interval between sweeps.
Claims11
Electronic circuit apparatus comprising:
- main generator means which responds to a trigger signal applied thereto for producing an output signal which varies monotonically with time;
- a plurality of comparator means, each having an input connected to receive said output signal from said main generator means for comparison with a signal applied to another input thereof, each of said comparator means producing a trigger signal in response to the signals applied to the inputs thereof attaining a predetermined relationship;
- means coupled to each said another input of said comparator means for applying signals thereto;
- delayed sweep generator means for producing a sweep signal in response to a trigger signal applied thereto;
- circuit means coupled to said comparator means and to said delayed sweep generator means and responsive to the trigger signals applied to the main generator means for applying trigger signals alternately thereto from said comparator means;
- and
- means coupled to said comparator means for producing an output indication of the time interval between appearance of trigger signals produced by said comparator means.
4 more elements
Method of controlling generation of an output signal comprising the steps of:
- initiating a main sweep to produce an output having a parameter that varies monotonically in value with time in response to each recurring input event;
- comparing the main sweep with a pair of reference values for producing a trigger output in response to the main sweep attaining a predetermined relationship to a reference value;
- and
- responding to the occurrence of input events for initiating the output signal in response alternately to the main sweep attaining a predetermined relationship to each of the reference values.
1 more element
Dependencies are inferred from the claim text.