Michael C Beyers

US Patent:

57901333, Aug 4, 1998

Filed:

Feb 27, 1996

Appl. No.:

8/607671

Inventors:

Matthew S. Holcomb - Colorado Springs CO
Michael L. Beyers - Colorado Springs CO

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06T 100

US Classification:

345501

Abstract:

A method, and circuit for implementing the method, allow a deep memory digital oscilloscope or logic analyzer to rapidly display large data records. Incoming signals are "dually" processed through multiple data compression circuits so as to create and store at least two data records. A smaller record is available for immediate and rapid display. A larger record is available for subsequent panning & zooming. By storing sequential data records in alternating memory divisions and eliminating data moves, the larger record may also be viewed more rapidly.

US Patent:

57544395, May 19, 1998

Filed:

Dec 26, 1995

Appl. No.:

8/578503

Inventors:

Matthew S. Holcomb - Colorado Springs CO
Michael L. Beyers - Colorado Springs CO

Assignee:

Hewlett-Packard Co. - Palo Alto CA

International Classification:

G01R 1300

US Classification:

364487

Abstract:

In a test instrument, display locking is reduced by the addition of a non-constant time delay to each acquisition cycle. The time delay may be randomly chosen or follow a predetermined algorithm. Decreased system throughput caused by the addition of a non-constant time delay may be minimized by alternately storing acquired data in two acquisition memories. Display locking may also be reduced by rejecting selected triggers. The data acquired from these selected triggers is not processed for display. The triggers whose data is not processed for display may be randomly chosen or they may be chosen by a predetermined algorithm. Rejecting triggers and the addition of a non-constant time delay may be used in combination or individually to reduce display locking.

US Patent:

61114006, Aug 29, 2000

Filed:

Oct 30, 1998

Appl. No.:

9/182684

Inventors:

John Angus Foster - Colorado Springs CO
Michael L. Beyers - Colorado Springs CO

Assignee:

Agilent Technologies - Palo Alto CA

International Classification:

G01R 1320
G01R 1300
G01R 1302

US Classification:

324121R

Abstract:

A digital oscilloscope automatically selects as the initial instance of a waveform parameter to be measured the instance that is both visible in the displayed trace and closest to the trigger reference point. Such a manner of automatic selection allows a greater amount of panning and zooming while the 'scope is subsequently stopped, without causing a different instance to become the measured instance, and also reduces confusion about continuity of measurement while the display is altered with the 'scope is still running. This automatically selected choice can still be overridden, if desired, by a manual selection. A further refinement is to, once an instance is automatically selected, retain it as the selected instance as long as it remains visible as part of a modified displayed trace, even if it would not otherwise become the selected initial instance if the measurement activity were first initiated with that modified trace. Still another refinement is to alert the operator that, owing to the previously automatically selected instance having been panned or zoomed off screen, a new and different automatically selected instance is now being measured.