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Sherlock Ohms

Case of the Deep-Fried Resistors

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npitech
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Iron
Co-incidentally
npitech   2/1/2012 1:46:24 PM
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I believe the same technique was used for resistors in that HP34401 that you were using. It was definitely used in several of the dvms.

 

 

Charles Murray
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Re: Creative problem solving
Charles Murray   1/31/2012 7:04:28 PM
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Yes, I agree, Beth. Talk about out-of-the-box think...this is amazing. Great story, Steve.

Alexander Wolfe
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Re: Burn in by burning in
Alexander Wolfe   1/31/2012 3:07:32 PM
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Thanks for clarifying, Steve.  That's analogous to what vacuum tube vendors used to do, when they sold matched pairs for amp output stages (eg., 12AX7s).

Steve Lindberg
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Re: Burn in by burning in
Steve Lindberg   1/31/2012 1:52:49 PM
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Alexander, it wasn't really burning in the resistor, but measuring the temperature coefficient. As the circuit warmed, the mismatch between the two resistors changed.

By observing an induced delta, we could select parts that drifted alike.

Steve Lindberg
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Iron
Re: Creative problem solving
Steve Lindberg   1/31/2012 12:38:18 PM
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The process remained the same for the life of the probe.

Alexander Wolfe
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Re: Burn in by burning in
Alexander Wolfe   1/31/2012 12:37:39 PM
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Good to hear, Steve. As long as you're not deep frying a turkey, which carries additional risks beyond whatever it takes like.

Steve Lindberg
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Iron
Re: Burn in by burning in
Steve Lindberg   1/31/2012 12:35:57 PM
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We only cook fondue about once every 6 months so I wouldn't consider a contributor in my eventual demise.

Alexander Wolfe
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Burn in by burning in
Alexander Wolfe   1/31/2012 12:09:37 PM
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So you literally burned in your resistors by burning them in? Brilliant. BTW, you're lucky your fried cheese steak dinner didn't kill you before you got to the lab to come up with your gastronomically inspired solution.

williamlweaver
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Platinum
Re: Creative problem solving
williamlweaver   1/31/2012 9:13:08 AM
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Our laser lab was resplendent with scopes and meters from LeCroy, Agilent, and SRS. Now I know why we always went out for cheese steaks after using the LeCroy. I wonder if LeCroy had a subliminal contract with the anti-cholesterol pharmaceuticals industry...

Beth Stackpole
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Blogger
Creative problem solving
Beth Stackpole   1/31/2012 9:03:42 AM
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You have to applaud the out-of-the-box thinking on this Sherlock Ohms post. Curious to know what replaced the deep fryer once the build process moved to corporate headquarters?

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