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  Volume 2 - Issue 41 - 4/29/02
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Lion Precision's GageMaster

Lion Precision's GageMaster Advanced Measurement System

Lion Precision, a world leader in high-performance capacitance sensors, just made non-contact sensing easier. The GageMaster Advanced Measurement System provides two channels of capacitance gaging with self-contained data acquisition, signal processing and display.

  • Color TFT touchscreen interface
  • Two measurement channels
  • Preset and user defined configurations
  • Sum, Difference, TIR, Max, Min
  • Two sets of tolerance limits
  • Digital "Out of Tolerance" outputs
  • Several display configurations
  • Two channels of analog input from other sensors
  • Integral Thermal Printer (included) and Accessories pouch
  • PC serial interface

We just made your life a lot easier. See the GageMaster at Sensors Expo in San Jose, Booth #1024.

Click here to browse Lion Precision's online catalog. Or contact them via e-mail.

Click Here to Visit Watlow

No Matter How Hot It Gets, Watlow Has It Under Control


Watlow's premium components offer better control of your thermal solutions, while their reliability offers better control of your costs.

Whether your heating requirements call for just one thermal component or an entire thermal solution, Watlow is your single source for the best products. Our full line of high-performance heaters, sensors, controllers and software offer long-lasting reliability.

With Watlow, you get more than a commitment to quality - you get a design partner with 80 years of industry experience!

To e-mail Watlow, click here.

Or, to browse Watlow's online catalog, click here.

Coming Soon To GlobalSpec – Service Finder!

Do you have a need to locate companies that provide services such as part fabrication and production, electrical/electronic contract manufacturing and engineering services? Well stay tuned because coming in mid-May, GlobalSpec will be entering another realm of search capability, launching GlobalSpec as an engineering super-site! More details to come!

Looking for Accelerometers, Infrared Spectrometers, Linear Potentiometers, Resistors, or Solid State Relays?
Find them on GlobalSpec.com!

 Accelerometers

Instruments for measuring, displaying, and analyzing acceleration and vibration. Accelerometers can be used on a stand-alone basis, or in conjunction with a data acquisition system. You will find contact information for 83 manufacturers in this category.
Click here to search for Accelerometers by Spec.


 Infrared Spectrometers

IR spectroscopy is the measurement of the wavelength and intensity of the absorption of infrared light by a sample. Mid-infrared light (2.5 - 50 µm, 4000 - 200 cm-1) is energetic enough to excite molecular vibrations to higher energy levels. The wavelength of IR absorption bands are characteristic of specific types of chemical bonds, and IR spectroscopy finds its greatest utility for identification of organic and organometallic molecules. You will find contact information for 61 manufacturers in this category.
Click here to search for Infrared Spectrometers by Spec.


 Linear Potentiometers

A linear potentiometer is a sensor that produces a resistance output proportional to the displacement or position. The resistance element is excited by either DC or AC voltage, and the output voltage is ideally a linear function of the input displacement. You will find contact information for 36 manufacturers in this category.
Click here to search for Linear Potentiometers by Spec.


 Resistors

A resistor is an electrical component that opposes the flow of either direct or alternating current. They are employed to protect, operate, or control the circuit. Voltages can be divided with the use of resistors, and in combination with other components resistors can be used to make electrical waves into shapes most suited to the electrical designer's requirements. Resistors can have a fixed value of resistance, or they can be made variable or adjustable within a certain range, in which case they may be called rheostats, or potentiometers. Resistors values are expressed in Ohms, the electric resistance unit. You will find contact information for 134 manufacturers in this category.
Click here to search for Resistors by Spec.

 Solid State Relays

Solid state relays or semiconductor relays (also called SSRs) are semiconductor devices that can be used in place of mechanical relays to switch electricity to a load in many applications. They are purely electronic devices, normally composed of a low current control side and a high current load side (switching side). Many solid state relays feature electrical isolation in the thousands of volts between the control side and the load side. This is usually achieved through optical isolation using an optoelectronic device (a photocoupler). You will find contact information for 72 manufacturers in this category.
Click here to search for Solid State Relays by Spec.

Featured Products

A visit to the GlobalSpec Featured Products page will keep you informed of new technologies and product developments from over 1,100 suppliers. Our most recent site update brings the number of products in the Featured Products section to over 3,300. You can research these products by keyword, manufacturer, the month they were added or by browsing product categories.

Click here to learn about the newest products and technologies from your favorite suppliers!

Technical Library Spotlight: Piezoelectric Accelerometers, Design & Use

Located in the Acceleration section of the GlobalSpec Technical Library, "Piezoelectric Accelerometers, Design & Use" covers topics such as Measuring Acceleration and Accelerometer Mounting. An excerpt of this article, provided by Kistler Instrument Corp., follows:

"Piezoelectric accelerometers consist essentially of three basic elements: the transducer body, the piezoelectric sensing element and the seismic mass. The original Kistler piezoelectric accelerometers incorporated a compression design whereby the compression cut, quartz crystal sensing element is preloaded between the base plate and seismic mass. Because of the constant seismic mass, the force acting on the measuring element is proportional to the acceleration in accordance with Newton's first law: F=ma. An electrical charge is generated proportional to the force (and hence the acceleration). Because they are basically AC coupled devices, piezoelectric accelerometers are not suitable for measuring constant (DC) accelerations like those generated in a centrifuge."

Click here to connect directly to "Piezoelectric Accelerometers, Design & Use."

The complete list of topics available in the Acceleration section:
  • A 3-Axis Silicon Piezoresistive Accelerometer
  • Introduction to Piezoelectric Accelerometers
  • Piezoelectric Accelerometers, Design & Use
  • Piezoelectric Theory
  • Technical Definitions of Terms (Pressure Transducers, Load Cells, Accelerometers)
  • Trends in Accelerometer Design
  • Trouble Shooting Accelerometer Installations
Visit the Acceleration section of the Technical Library.

The Challenge - What explains the variances in the orbit speed of Jupiter's moons?

The situation presented in the last edition of the newsletter was: In 1676, the Danish astronomer Ole Romer (1644-1710) was studying the orbits of Jupiter's Galilean satellites. Over a period of many months, Romer noticed that the orbits of the moons of Jupiter lose time for about 6 months, and then gain time over the next 6 months, losing and gaining about 8 minutes each cycle between successive oppositions. What physical phenomenon provided the explanation for this anomaly?

Answer: Ole Romer realized the phenoma could be explained if the speed of light was finite (as had been suggested earlier by Galileo). Since light from Jupiter had to travel further when the Earth was on the far side of the sun, and he had the change in time from his observations, he was able to calculate the speed of light to be roughly 225,000 kilometers per second. This calculation, although inaccurate (299,792 k/sec is correct), was significant because it was the first time the speed of light was measured successfully in a time when many scientists remained unconvinced that light had a finite speed.

Here's a sample of the comments sent in:

"Because the distance between the Earth and Jupiter varies in an Earth-year, Ole Romer was able to estimate the speed of light because of the extra distance the light from Io has to travel during different times of the year."

"The period of the orbits of Jupiter's moons had previously been perceived to vary, but Romer pointed out that it is the Earth's movement plus light's constant speed which create this appearance. That is what we would call a Doppler effect."

"The earth would be further away from Jupiter for half of the year, the speed of light making the phenomenon."

"The constant speed of light makes it appear that Io's orbit around Jupiter changes as Earth comes closer to, and then recedes from, Jupiter."

New Question: Why does a hard-boiled egg spun on a tabletop rise on one end and whirl like a top?

The answer will be posted in the next edition of the GlobalSpec newsletter.

"The Challenge" is presented for a little fun. If you have a teaser that you'd like to submit, please e-mail the question and answer to: cchestara@globalspec.com. (The more difficult the challenge, the better!)

These SpecSearchable product categories were recently
added to the GlobalSpec site.
A - E (New Categories)
F - O (New Categories)
P - Z (New Categories)
Listed below are the SpecSearchable manufacturers recently added to GlobalSpec.com,
including links to their online catalogs.
A - G (New Suppliers)
H - O (New Suppliers)
P - Z (New Suppliers)

GlobalSpec Links & News

  Are you planning to attend the Sensors Expo & Conference in San Jose, May 20 – 23? If so, be sure to stop by the Networking Reception and Awards Ceremony on Wednesday, the 22nd (4:30 p.m. in Ballroom A). GlobalSpec is sponsoring the reception, and our team looks forward to speaking with you! And of course, while there, you'll see who wins the Spring 2002 Best of Sensors Expo award. Listed below are those semifinalists with searchable catalogs on GlobalSpec, in addition to their nominated product:

 When you need engineering information quickly and easily, be sure to visit to the GlobalSpec Technical Library. You'll find application notes and tutorials, engineering information, reference links, and general information links of value to working engineers. With over 1,000 articles and links, it's a great reference tool!

"I am enough of an artist to draw freely upon my imagination. Imagination is more
important than knowledge. Knowledge is limited. Imagination encircles the world."
- Albert Einstein

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