Ett-p Rdjournal Â€ " a Hewlett-packard Journal Contents: April 1983 Volume 34 Â€¢ Number 4 Noise Figure Meter Sets Records for Accuracy, Repeatability, and Convenience, a New Microcomputer-controlled Laser Dimensional Measurement and Analysis System Dimensional Metrology Software Eases Calibration S
A New and Laser Dimensional Measurement and Analysis System, by Robert C. Quenelle and Lawrence J. Wuerz It's more compact, more powerful, and less expensive than previous systems. Dimensional Metrology Software Eases Calibration, by Lawrence J. Wuerz and Chris topher time An HP-85 Computer automates complex laser calibrations to save time and reduce errors. Automatic Compensation, by Deane A. Gardner Sensors help the laser measurement system compensate for atmospheric conditions and material temperature. Laser Optical Components for Machine Tool and Other Calibrations, by Richard R. Bald component Larry E. Truhe, and David C. Woodruff Each optical component is designed to mea sure a particular degree of freedom of a machine tool. Manufacturing the Laser Tube, by Richard H. Grote Custom-designed machines auto mate the process to control quality at every step. Mechanical Design Features of the Laser Head, by Charles R. Steinmetz Low manu facturing cost and ease of repair are designed in. Measurements that used to be tedious or inaccurate or both are now neither. Laboratory Notebook â€ " Mass Storage Unit Exerciser The problem was how to provide built-in diagnostics for a flexible disc drive that didn't come with them. In this Issue: In this surface, world of ours, there's no such thing as a straight edge, a flat surface, or parallel lines. Those who inhabit the world of precision machining are constantly reminded of these newest as designers demand tolerances just a little tighter than the newest and best Â» machine a can deliver. In this environment, it's essential to know just how imperfect a machine tool is. Many machine tools are computer controlled and can be programmed to compensate for errors if accurate calibration data is available. Because today's machine tools are very, very precise, it takes a super-precise measuring tool 22, Laser them. The subject of the articles on page 3 to 22, the HP 5528A Laser Measurement System, is such a tool. The LMS consists of a laser head, precision optical components, and a microcomputer-based measurement and display unit, optionally augmented with an HP-85 Computer. The cover photo shows it doing its job. The LMS is used periodically or as needed to check a machine's accuracy, to provide data for computer error compensation, to detect wear, and to diagnose problems. Back described as 1 970, HP's first laser measurement system was described in these pages as "a two-hundred-foot LMS with graduations every microinch." The …
An Automatic Noise Figure Meter For Improving Microwave Device Performance
SEE ALSO: provided in microwave devices such as TI receivers, forwardwave and backward-wave tubes, etc. In addition to being a fundamental property, however, noise figure can also be much faster and easier to measure than equivalent measurements with signal generators. From a performance standpoint, improving receiver noise figure in a system such as a radar is just as valuable and tremendously more economical than increasing transmitter power an equivalent amount. A 5 db improvement in receiver noise figure, for example, is equivalent to increasing transmitter power by 3:l . To enable noise figure to be measured simply and accurately and with economy of equip”Noire figure and its measurement,”
Capturing Crime in the Antipodes: Colonist Cultural Representation of Indigeneity
This chapter adopts a Southern criminological lens, which allows the authors to explore how colonialism has been constructed and depicted in museums within both regional and urban Australia. By studying spatial and historical silences in Australian museums, this chapter offers a consistent frame to chronologically chart Anglo-Australian depictions of Indigeneity, imperialism and violence wielded by the state. As this chapter will argue, museums can often reflect Westernized (white) conceptualizations about Indigeneity and the state violence involved in colonization, which actively re-enforces popular views and influences sociopolitical visions of identity, the state and justice.