A lowmass lowinertia plotting mechanism provides highquality ECGs in a variety of convenient formats

Koerper, Martin K. Mason, and Steven A. Scampini N ELECTROCARDIOGRAPH is a machine that takes inf ormation in the form of bioelectric voltages i from a series of sensors, called electrodes, attached to the body and records the.se voltages for analysis and diagnosis. The records are called electrocardiograms (ECG) and are described in the box on page 20. The electrocardiograph must address many special problems because of where it is used, what it is used for, and...

Contents

Development of a High-Performance, Low-Mass, Low-Inertia Plotting Technology, by Wayne D. Baron, Lawrence LaBarre, Charles E Tyler, and Robert G. Younge Looking for a plotter mechanism small enough to put in a pocket led to this innovative, simple design Plotter Servo Electronics Contained on a Single IC, by Clement C. Lo This integrated circuit chip greatly simplified the design of products using HP's new plotting technology. An Incremental Optical Shaft Encoder Kit with Integrated...

In this Issue

This issue and next month's issue are devoted to a new X-Y plotting technology. An X-Y plotter is a machine that draws pictures under the control of a computer. My first look at this new kind of plotter was an eye-opening experience For one thing, the pen was moving faster than any plotter pen I had ever seen, But the truly astonishing part was that the paper, driven by rollers, was moving back and forth just as rapidly As I watched. Chuck Tyler, one of the authors of the article on page 3,...

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To draw a line (a) from one point to another, the axis drive motor requiring the greatest position change is set to its maximum velocity (b) and the velocity of the other axis drive motor is sel proportionately Thus, the drive pulses lor each motor (cj will occur at different rates according to the velocities required to draw a straight line. Fig. 3, Algorithm for controlling pulse rates to each axis drive motor during a move from one point to another. based microcomputer The aata...

V V Upper Page

V-i'Tl , < -iMcotvi.vs.ve Fig. 5. An operating card is supplied with the 4700A to aid the user in selecting and modifying the ECG format Additional information (not shown) provides operating instructions and interprets displayed error codes. Fig. 5. An operating card is supplied with the 4700A to aid the user in selecting and modifying the ECG format Additional information (not shown) provides operating instructions and interprets displayed error codes. Fig. 6. Control panel of the...

Plotter Servo Electronics Contained on a Single IC

The new X-Y plotter technology described in the accompanying article allows the designer to reduce the complexity and cost associated with the servo control electronics of an electromechanical device Hewlett-Packard Laboratories built numerous prototypes that established the relationship between the digital control circuitry and the mechanism. To achieve me objectives of low cost, small size, low power consumption and high reliability, all of the required digital servo control electronics...

Digital Control Simplifies XY Plotter Electronics

The dominant tneme ot The new ow-mass ow- nertia X-Y plotter Technology is simplicity. This concept is not only prevalent in the mechanism but is the basis of The electronic architecture Fig 1 - The job of the siectronics is to accept a series ot vector and per lift commands from an external source such as a calculator, computer, or another microprocessor, and then to convert these commands intothe appropriate movements of the pen and paper The first stage of this process Takes place in a...

An Incremental Optical Shaft Encoder Kit with Integrated Optoelectronics

This kit can be assembled easily by an OEM original equipment manufacturer to provide accurate digital information about shaft position and velocity in digitally controlled electromechanical systems. by Howard C. Epstein, Mark G. Leonard, and John J. Uebbing HERE IS AN INCREASING DEMAND for digital control of mechanical motion. Incremental shaft encoders allow closed-loop control by sensing the rotational position of the system. A controller compares the actual and desired shaft positions and...

What Is an Electrocardiogram

Steve Scampini

An electrocardiogram ECG is a test used widely to assess the condition of the heart noninvasively. The ECG is used to evaluate the status ot the heart's conduction system, the status of the muscle and. indirectly, the condition of the heart as a pump. The ECG is a graphical presentation of the pioe ectrical activity voltage of the heart muscle and an ECG machine electrocardiograph is a recording voltmeter The heart Fig. 1 has tour chambers called the right and left atria and ventricles. The...

A new vector plotter technology makes possible small inexpensive graphics products that provide highquality plots

Baron, Lawrence LaBarre, Charles E. Tyler, and Robert G. Younge AND ACCOMPANYING ARTICLES in this and next month's issues will trace the evolution of a new S plotting technology from muse to market. This article describes the authors' early thinking and experimentation in Hewlett-Packard's corporate research laboratories, We will also describe our interaction with colleagues in other parts of the company, and how this focused our work, helping us produce the tools they needed to...