Blog Archives

Metal Oxide Varistor (MOV) DMX Analysis File Released

Metal Oxide Varistor (MOV) DMX Worst Case Analysis File
MOV1 $12.50

(DMX files are available free to Design Master™ Professional Edition users who purchased or upgraded DM not more than one year prior to the DMX file release date.)

The MOV analysis determines whether a Metal Oxide Varistor transient voltage suppressor will (a) survive a specified surge voltage or current, (b) clamp the surge below a specified voltage limit, (c) not clamp the normal operating voltage, and (d) survive a specified number of surges. MOVS are typically rated with 8x20us current waveforms, and (just to be confusing) 10x1000us energy waveforms. MOVs also have a lifetime (number of allowable surges) that depends on peak current, pulse width, and temperature. To complicate things further, MOV clamping voltages are a nonlinear function of surge current. To help make the design engineer’s job a little easier, this analysis contains adjustment formulas for all of these factors. Also provides standard surge waveform requirements and helpful hints.

DMeXpert™ (DMX) files guide the user with pop-up instructions, component selection lists, standard part values, important formulas, and a variety of other tips that are activated when entering a Formula cell. It’s like having a design/analysis expert at your side.

AC Full Wave Bridge Rectifier DMX Analysis File Released

AC Bridge Rectifier DMX Worst Case Analysis File
ACBR1 $19

(DMX files are available free to Design Master™ Professional Edition users who purchased or upgraded DM not more than one year prior to the DMX file release date.)

This updated and easy-to-use analysis provides all of the key waveforms, voltages, and currents for the AC full wave bridge rectifier circuit, including the effects of source ohms. Output includes average input amps, rms input amps, input watts, Rs watts, capacitor rms amps, average load volts, average load amps, and output watts.

Capacitor Current

DMeXpert™ (DMX) files guide the user with pop-up instructions, component selection lists, standard part values, important formulas, and a variety of other tips that are activated when entering a Formula cell. It’s like having a design/analysis expert at your side.

4th Qtr 2010

(C) 2010 Design/Analysis Consultants, Inc.
Newsletter content may be copied in whole or part if attribution
to DACI and any referenced source is prominently displayed with the copied material

This Issue: NEWS BITE: Reporters Scramble To Adapt To Cameramen Layoffs During Economic Downturn! / DM V8 And DMX Released / REVIEW: The Social Network: Entertaining But Not True / NEWS BULLETS: Unintended Consequences (Reusable Grocery Bags) / RECREATION: Having Fun With Fantasy Football

NEWS BITE: Reporters Scramble To Adapt To Cameramen Layoffs During Economic Downturn!


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Teleactor Annamarie Ho. Photo: Bart Nagel
Q&A: Ken Goldberg Discusses Telerobots, Androids, and Heidegger,” by Erico Guizzo, IEEE Spectrum, 1 Oct 2010

DESIGN MASTER: DM V8 with DMeXpert™ (DMX) Released

DMX provides expertly-designed “fill in the blanks” templates for thorough and efficient worst case analysis. Click here for details. If you purchased Design Master on or after October 4 2009, you can obtain an update at no charge; please contact us for download instructions (new install required for V8).

REVIEW: The Social Network: Entertaining But Not True
“Mark Zuckerberg, Facebook’s young and intrepid creator, is portrayed as a geek who starts his path to dot com glory after getting dumped by a girl … If it were true it would be a lot more compelling.  Back in 2005 and 2006, shortly after the film is set, I interviewed Zuckerberg on several occasions, and he wasn’t much like the guy on-screen.  In addition to actually having a girlfriend, a fact left conveniently out of the film, he had a lot of thoughtful things to say about the world he was creating online. ”
The Social Network’s Science Fiction,” by David Kushner, IEEE Spectrum, 7 Oct 2010

The Bozo Award is presented to screenwriter Aaron Sorkin and the movie’s producers for their lack of integrity, as demonstrated by their willingness to damage reputations through false representations of actual events.

NEWS BULLETS: Unintended Consequences Strike Again

“The CALL7 Investigators tested several reusable bags used by 7NEWS colleagues and another from a woman going into a Denver grocery store. Marchetta took the lab results to Dr. Michelle Barron, the infectious disease expert at the University of Colorado Hospital. ‘Wow. Wow. That is pretty impressive,’ said Barron. Barron examines lab results for a living. ‘Oh my goodness! This is definitely the highest count,’ Barron commented while looking at the bacteria count numbers.”
-“Reusable Grocery Bags Breed Bacteria” By Theresa Marchetta, 28 Sep 2010 Denver News

RECREATION: Having Fun with Statistics and Fantasy Football
Design Master™ is used by engineers to help create highly reliable products, but it has been suggested to us that it can be used for some fun, too, such as fantasy football or other games that use statistics. It might even provide a bit of an edge, because its probability models provide more information than simple statistical averages.

For example, you can define a group of players in the Variables Library, enter the raw stats for each player, and let Design Master generate their “player strength” probability models (Tools/Make A Model From Raw Data).

In the worksheet, you create a simple Team formula that defines the strength of the team, using a weighted sum of all the players —

TeamA = 0.2*Player1 + 0.10*Player2 + 0.15*Player3 + …

— where the weights add to 1.0 (100%).

Then press Calculate to generate the team’s probability model.

Repeat this for a competing TeamB and its players, and then compare the team models:

 

 

TeamA strength = 5 to 10                                                TeamB strength = 4 to 16

There are many ways to make a  comparison, but a simple way would be just to subtract the teams. For example, to determine the probability of TeamA losing to TeamB,

TeamAWin = TeamA – TeamB

where the minimum limit is set to zero (i.e. the case where TeamA is less strong than TeamB).

Probability models help guard against counter-intuitive bets. In this example, it may appear that TeamB (max strength of 16) is superior to TeamA (max strength of 10). But if you look at average strengths, TeamA comes out on top (8 to 7). How should these factors be evaluated?

Press calculate, and the resultant probability distribution indicates that the “weakling” Team A only has about a 12% chance of losing to TeamB:


Furthermore, knowing the actual probability of 12% provides an added edge for intelligent odds-making … all in fun, of course.

Q&A: Ken Goldberg Discusses Telerobots, Androids, and Heidegger

Announcing The Design Master Expert Assistant

DMXAnnouncing the Design Master Expert Assistant with the release of Design MasterTM V8

The DMeXpert™ (DMX) Edition guides the user with pop-up instructions, component selection lists, standard part values, important formulas, and a variety of other tips that are activated when entering a Formula cell. It’s like having a design/analysis expert at your side.

DMX is ideal for the design engineer or project manager who needs quick and efficient “fill in the blanks” design validation in minutes rather than weeks. Based on DACI’s thorough and practical worst case analysis plus (WCA+) methodology, DMX uses expertly designed templates to facilitate analysis of a variety of standard circuits.

In addiDM8tion to its standalone function, DMX is an integral part of the just-released Version 8 of Design Master’s Professional Edition. DMX facilitates efficient organization and selection of circuit and part files, and also provides easy access to an organized array of tutorials and DMeXpert tips.

Circuit templates, part files, and help files can be accessed and edited by using the Professional Edition. This allows an organization’s design experts to use the Professional Edition to create DMX templates tailored to the needs of the company.

For more information, please click here.