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  • Author Author: DaveYoung
  • Date Created: 26 Mar 2012 11:06 PM Date Created
  • Views 557 views
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  • Comments 2 comments
  • management
  • Design
  • dyoung
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Error Budgets Launch Careers!

DaveYoung
DaveYoung
26 Mar 2012

imageAfter my last article on what error budgets  are, I imagine there were plenty of people who thought that calculating error budgets on a complex product would be a pretty tough way to start a job.    To the contrary, I found them to be the single best project a junior engineer can be assigned.  And no, that's not because it's funny to give the rookie tasks with the most excel work.

 

First, let's talk about who junior engineers are.  The new hire will have been well educated, maintain a high energy level, and will be used to heavy calculations from their recent college education.  Heck, some college programs would lead students to expect nothing BUT calculations in the engineering profession!  Plus, if the right one was hired he or she will be eager to learn from and impress the senior engineering staff.

 

On the surface, there are many reasons that a manager would not want to give a rookie the task of leading up an error budget.  It is a very difficult task that requires a lot of critical thinking, engineering assumptions, and flawless organization; all daunting requirements for a new engineer.  There are also social and professional implications to a rookie telling a seasoned veteran what is wrong with their design, perhaps learning how to confront statements like “There's nothing wrong with that circuit. Check it again, Sport.”  And of course the master of the error budget is also expected to deliver bad news to marketing and purchasing like, “We can't hit this spec” and “We need this expensive, long lead time part.”  But what better way to get your new employee off to a good start than challenging him or her from day one?!?

 

To the companies that look past these challenges, go great benefits!  The new hire gets the best experience possible: direct access to a senior engineer where lessons on how different circuits work will undoubtedly occur often.  This is where the majority of learning and passing of company knowledge happens and should be encouraged at every turn.  The junior engineer also gains the opportunity to be the resident expert on a topic by leading a project, all within 6 months of starting work.  The manager also has a lot to gain.  With the significant challenges listed above, leading an error budget is an extraordinary vetting ground to determine what the rookie is capable of.

 

Finally, you want to give the error budget to the rookie since no engineer in their right mind would do more than a couple error budgets!  It could be a rite of passage into the design team, with each member having their own war stories about the raw endurance it took to find a circuit error – and the $Millions the resulting fix saved!

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  • DaveYoung
    DaveYoung over 13 years ago in reply to gervasi

    Too true!  These kinds of engineering assumptions have to be made every step of the way.  In situations where such values are important, it usually is settled with a call to the manufacturer to understand what kind of distribution exists and use statistics as means to an answer given a required confidence interval. 

     

    Like I said, exactly what a rookie engineer should do to learn about circuit accuracy!

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  • gervasi
    gervasi over 13 years ago

    I imagine in the error budget you sometimes look into details even the designers didn't consider. 

     

    I encoutered tolerance budgets on a mechanical project, in which I wanted just to the root square sum of error components.  I imagine mechanical parts' deviation following a Gaussian distribution, while I imagine electronic parts being bimodally distributed.  People say values of components like resistors are bimodally distributed because on a reel of 5% resistors, all the ones tighter than 2% went to 2% reel.  All the ones between 5% and 10% go to the 10% reel.  Experimentally I have found values that disprove this, assuming my meter is cal'ed.  I wonder if there's any truth to the bimodal story.

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