Robert M Landgraf

Title: Robert M. Landgraf and His Oscilloscope Innovations.

Introduction

Robert M. Landgraf is an inventor associated with Woodland Park, Colorado, and Hewlett-Packard Company. His patent work includes innovations in oscilloscope triggering and waveform digitization. His record lists 2 patents.

Latest Patents

Landgraf’s listed patents address ways to improve the accuracy and flexibility of oscilloscope measurements.

“Channel-gain-vernier-tracking trigger hysteresis for an oscilloscope” describes a circuit designed to maintain constant effective hysteresis at an oscilloscope’s trigger comparator, helping prevent false triggers and repeated triggering. A microprocessor tracks the trigger amplifier’s gain inversely to the vertical vernier amplifier’s gain, adjusting the trigger signal to preserve consistent hysteresis.

“Programmable delay for digitizer circuits” describes a digitizer that converts analog waveforms displayed on a cathode-ray tube (CRT) into digital signals for storage. A microprocessor uses user-defined parameters to determine when the CRT’s vertical amplifier output is sampled. The design lets users set sample resolution and position the sampling window, which can be highlighted on the display before sampling begins.

Career Highlights

Landgraf’s listed inventions focus on measurement instrumentation. They address reliable oscilloscope triggering and user-controlled sampling of displayed waveforms, supporting more precise analysis and digitization.

Collaborations

The provided information lists William B. Risley and Johnie L. Hancock as Landgraf’s coworkers. His patents are associated with Hewlett-Packard Company.

Conclusion

Robert M. Landgraf’s patent work reflects practical innovations in oscilloscope design, combining stable trigger behavior with flexible waveform digitization.