Dick I'll just have to let this one go. If I gave my full opinions on this I would get the bin for sure.
EDIT - We could start here - In 2012, Wilmar was named the world's least environmentally friendly company by US news magazine Newsweek. Due to their poor environmental performance they were excluded in 2013 from The Government Pension Fund of Norway, the largest stock owner in Europe. Now go read the boilerplate on Wilmar's website.
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Not that I have an axe to grind but how could anything possibiy be less environmentally friendly than a large non-renewable energy extraction company?
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That's beside the point, Wilmar is one of the big examples in Dick's reference and if you read their website it contains a carefully crafted line of BS with every popular buzz word like "biodiversity". I guess there's not enough waste oil from Mc'D's fries so we have to burn down some rainforest to make biodiesel. BTW the biodiesel busses here smell like Dunkin Doughnuts.
Fracing and propane power make so much more sense to me.
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Yes just like the spectacular shortages in ldcs ( thru higher prices for meal) created in order to make subsidised ethanols fuels.
It reminds me of my own experience.
As a teen I attended technical high school, which taught general education along electronics (which was called 'radio' on those days. 'Radio' was my hobby, so I didn't do homework on the general education classes. Thus I was flunked before the final year, without any certification.
Onwards I worked most of the time as an electronics technician.
About 10 years ago, at about the age of 60, I was hired as a technician by an Hi-Tech startup company. The developed a satellite modem for digital data. On my first day at work, when I was shown the lab and the prototype they were working on, by the 2 engineers, I told them there was no way the thing could work properly. (The PCB, which included digital, analogue and RF circuit, was covered be a 'paste' made of dust and fingers moisture. It couldn't work properly due to leakages). The minute I pointed it out, the 2 engineers who were developing the product saw that it was so. A couple of weeks later I was given engineering tasks, on top of my technician tasks.
I never designed independently a whole product (other than simple voltage regulators). Yet, out of my experience and general 'sense' of the way electronic circuits work, I noted a major mistake that qualified engineers failed to see, until I pointed it out to them.
On the production floor, sitting next to one of the line workers, trying to do the work as competently as she can.....at 5% of her throughput.
How does a technician learn to engineer a well rounded product? By spending four years taking engineering courses. (Sorry, it is a engineer joke).
BTW, I had to go to Beijing to teach soldering to the engineers and physicists, you think USA engineer soldering skills are bad?? Shirley, you jest...
So do many engineers and companies. Designing in a vacuum is not the right way. But paying engineering wages while having them learn rudimentary skills is not amenable to the bean counters. They concentrate on short term only. Oh, and the safety people cringe at providing engineers tools which they most certainly will injure themselves with..
Not OT at all. Replace "nuclear" with "analog".
Agreed. But remember, they can also make mistakes. LHC lost 150 megabucks as a result of one solder joint failure. ITER is currently poised to make one as well as a consequence of ignoring advice, and with 30 gigajoules being stored in the main solenoid, the explosion would be significant.
I don't trust your methodology. The results may be right, may be wrong. Who knows??
jn
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Doug Grant and I published an app note (the proverbial 30 years ago) pointing out that saving space by mounting resistors on end created both a temperature gradient and differential cooling by having a different amount of lead on each end. At the -130dB level the thermocouple effects could easily account for a systematic second order error.
Ah, but isn't that why the politicians created ROHS?? To make sure Ed didn't see second order effects due to lead? (Pb).
jn
(leed...led....isn't English a grand language?)
Ok, eons are not required. A week or two in company of techs worth their salt would be ample to point out bad circuit/construction techniques....like placing electros hard up against regulators, high thermal mass components that do not tin/wet/solder properly, physically non-serviceable constructions etc, etc....the list is long.
Dan.
Technician joke....Why are engineers bald on their foreheads ?.
Because that's where they slap themselves when explained their errors..."slap, thats right !."
We certainly think along the same lines. My worry is the quick and "obvious" fixes techs sometimes do without regard to long term consequences impacting MTBF. Both camps certainly benefit by cross pollination.
I recall an oil filter on one of my cars, so deeply embedded between motor and transmission, that I had to pack a lunch prior to climbing under the car.. It was almost easier to drop the 4wd transmission to get to it.
jn
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And how many beats per minute can you tap with your finger?
JN you don't have to believe the test method or results. The resistor and test equipment guys seem to and are adopting the method.
Scott you just might want to look at the actual construction of a carbon composition resistor. It is the monkeys at the typewriter eventually producing Shakespeare. Enough ground carbon including crystals and other impurities and you will eventually get point contact diode junctions. Would you care to explain the source of the excess noise shown. BTY the resistors were tested horizontally mounted in a shielded enclosure as I thought you knew.
Sounds like a herd of lemmings.
Having a piece of test equipment capable of 10e-6 resolution doesn't guarantee accuracy at 10e-6 levels.
The term GIGO comes to mind. This is how microdiodes were "established" a long time ago, grain boundaries, skin effect ala Hawksford...
The common failures:
Use of methodologies consistent with 10e-2 or -3 accuracies but combined with a piece of equipment designed several orders of magnitude better...as you may be doing here.
or
Use of methodologies consistent with 10e-6 or -7 with equipment capable of only 10e-2 or -3 resolution.
or,
Use of methodologies consistent with 10e-2 or -3, and equipment capable of 10e-2 or -3, then reporting values consistent with the LSD of the display. As you did with the bybee inductance..
While you may indeed be onto something, you have yet to establish a rigorous methodology or analysis.
jn
Which exist at DC, measure them please (my simple bridge had no dead zone for sure). I assure you the excess noise has nothing to do with rectification. The model of excess noise as an ensemble of Lorentzian processes is well established.
And finally why do 100's of random "micro-diodes" have a preferred direction?
I just found a motherload of NOS Allen Bradley 1/8W resistors, it turns out someone saved all the little bins of them used to breadboard modules in the 70's. Time for some measurements. I have a new Keithley meter that forces voltage and measures current and visa versa to 6 digits.
Scott are you deliberately trying to twist my point?
SY the one you tap capacitors with m. What is the 1/2 M V sqd of your test?
SY the one you tap capacitors with m. What is the 1/2 M V sqd of your test?
No, I simply disagree, that is I think your point is wrong. There are no point contact micro-diodes.
Resistors have a TC, power heats them up, the exact thermal environment is hard to quantify, so at extremely low levels things show up. I have suggested several experiments to separate thermal and non thermal effects you do not seem interested. At this point it time I could reproduce my experiment at possibly 10x more resolution. Remember I was surprised to see nothing above the -120dB level and I already stated that in the same article the same resistor had lots of excess noise.
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And if you go back to my comments on testing for micro diodes in copper that is what I found. The test for diodes in a carbon matrix should show some, quantity and quality depending on the source.
I'll let George look for the patents on locating minerals by rf scams.
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