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Sherlock Ohms

Beeping Oven Called for a Debugging

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garysxt
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Iron
Re: Ieeew
garysxt   2/5/2013 9:01:27 AM
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My uncle was in the Signal Corps in the Pacific in WWII. He used to tell me about how the rats would try to get into the transmitters to get warm and dry out. Of course the results of a rat getting across a several KV plate supply is somewhat more spectacular than an insect across a low voltage switch.

Ratsky
User Rank
Platinum
Re: Country Life
Ratsky   2/4/2013 4:07:44 PM
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I had a similar experience when I lived in the Dallas TX area.  My house had a LV lighting system (12VAC) around the exterior and walkways.  There was a 300VA or so transformer that fed the system, with 2 separate outputs (dual secondaries on the xfmr).  I started having intermittent outages on some lights, but the bulbs were OK.  There wasn't much voltage at any of the fixtures on one of the outputs.  I traced the apparent short down to a specific point (all wiring as buried so I really wanted to only have to excavate where the problem was likely to be) by locating the first fixture that had minimum VAC at it.  I started to dig, and was quickly attacked by a bunch of fire ants!  After I did away with them (took a full day for all to die), I dug down and found their nest had been located surrounding a splice insulated with some badly chewed away electrical tape.  Thus a short between the conductors was created.  Unfortunately, the long-term overload had weakened the one secondary; a couple of weeks after the wires were re-taped (very heavily!), that secondary winding opened up.  I sent it back to the manufacturer, who was amazed that the primary protection hadn't tripped, and so the fusible link inside the winding had opened.   The resistance of the wiring to the short location was apparently just enough to let the winding overheat without tripping the circuit breaker in the transformer primary.  They sent me a brand-new transformer at no charge!  When a similar outage occurred some time later, I concluded that the ants really loved the AC field (maybe got high on it!), and made future repairs with even more protection on the splices.

tekochip
User Rank
Platinum
Re: Ieeew
tekochip   2/4/2013 2:34:04 PM
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Ann, when I was designing appliances I would sit down with the marketing guys and have them press buttons on a sheet of paper.  I would have them step through the keystrokes needed to implement what they had specified, and often times their fingers were doing a dance that looked like a version of "Twister" made for hands.  If the feature they wanted proved too complicated they would sometimes add a special button or knob just for that feature.  From their standpoint, now the nifty new feature was advertised because the consumer would see that feature button right on the front panel.


Ann R. Thryft
User Rank
Blogger
Re: Ieeew
Ann R. Thryft   2/4/2013 12:52:22 PM
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I agree with jmiller. And doesn't anyone who designs user interfaces on appliances ever use them? If they did, how could these interfaces (aka buttons, touchpads, knobs, etc) be so bad?

jmiller
User Rank
Platinum
Re: Ieeew
jmiller   2/2/2013 11:41:41 PM
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I don't understand why the industry can't realize that the american consumer just wants something that is easy to run.  I really don't need 17 different cycles to wash my clothes in.  I do want to be able to lock it out so my child doesn't accidently run the cat through the wash, but I don't have a PHD in unlocking my washing machine.  Is it really that tough.

Tim
User Rank
Platinum
Re: Ieeew
Tim   2/2/2013 7:16:11 PM
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Buttons and options can be difficult. On our GE front loader, a certain button combination will lock the control panel. Unfortunately, this option is not shown in the manual and required a service call by a technician to show me how to reset the lock.

robatnorcross
User Rank
Gold
Re: Ieeew
robatnorcross   2/1/2013 8:18:06 PM
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A friend of mine was visiting another guy one saturday morning and his friend remarked that his power bill was about zero the month before. My friend (a EE) said they should check to see if the meter was turning. Sure enough a moth had expired and was stuck in the meter works. My friend banged his hand on the meter and the bug fell out as the home owner screemed "OH No".

Charles Murray
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Blogger
Re: Ieeew
Charles Murray   2/1/2013 7:15:41 PM
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I agree, Cabe. This author was impressively determined.

Charles Murray
User Rank
Blogger
Re: Country Life
Charles Murray   2/1/2013 7:14:27 PM
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I recall the issue of the fire ants, notarboca. Some time in the last 20 years, a linear accelerator was planned for Texas (I believe it was eventually built there), but it ended up getting bogged down in debate about fire ants. Apparently, some engineers believed that the accelerator's large magnets would attract ants.

Cabe Atwell
User Rank
Blogger
Re: Ieeew
Cabe Atwell   2/1/2013 5:30:28 PM
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Haha! A true bug in the system.

Most people would have just turned off the electronics of the stove to never use them again. Glad your went above and beyond. That isn't an obvious reason for failure either...



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