Temperature measurement

I was thinking something more complicated with a software controlled signal to switch in the resistor etc. Your way does it all automatically and with the one signal, neat. As you say, "dual slope" integration.

I guess the circuit is not that all that "accurate" though. The unknown, variable switch resistance is in series with the RTD.

Parallel all 4 sections of the 'HC4066, and you get 10-12 Ohms... that's 0.1% against RT = 10K... that's pretty respectable, isn't it

Or use an inverter and a discrete PMOS. ...Jim Thompson

As I've noted here before... be careful of the delayed pay-out scam, run the numbers. I did, and found that delayed SS pay-out from 65 to

Emphasis on the term "old fashioned".

Others that come to mind are "archaic", and "outmoded".

READ IT, idiot. '1% within the range of...' '...20 to 45 degrees'. To me, that sounds like a standard declaration of accuracy over a range.

So, 1% of 25 tick points, because the span is through 25 degrees.

OR +/- 0.25°

Leaving money in the government's hands, longer than necessary, isn't a good strategy, either.

Depends on how long one survives. The insurance companies calculate the numbers based on survival rates calculated over the population as a whole. People with higher degrees live about ten years longer than their less-educated age-contemporaries.

The pension rates go up by about 50% if you wait five years. I'd need to get 8.5% per year appreciation to match that.

-- Bill Sloman, Nijmegen

Sure. And I met quite a few. I installed Cambridge Instruments electron beam testers at Thompson-EFCIS in Grenoble - the first prototype (which was supposed to be a copy of the the Siemens experimental rig, but we were able to design out some of the phsyicist's mistakes) and the first production machine at the Siemens labs in Munich, where we didn't say as much about the things that they had got wrong, and was involved in the salvage effort at TI at Nice in France, where we had to make the machine do a couple of things that marketing had promised that it would when they had only asked engineering whether it could ...

My mother would have understood that explanation a few years ago - she does have a bachelors degree in chemistry, even if she did graduate in

They all come down to the same idea. People trained in classical thermodynamics put more emphasis on entropy, but the statistical mechanical approach defines entropy in terms of distributions over energy levels, so it's a notational variant. I'm not surprised that you don't understand the concept well enough to appreciate that.

Probably not. The interesting thing about nitrosyl bromide - and nitrosyl chloride - isn't so much the decomposition reaction as the formation reaction, which involves the three-way collision of two molecules of nitric oxide and one of bromine (or chlorine). There's essentially no activation energy, which makes it an interesting test case for theoreticians.

i...

Personally, nothing - except the usual deferred income which I could have earned if I'd got a real job rather than hanging around university after getting my bachelors degree.

I had an Australian Commonwealth Scholarship that paid my tution fees as an undergraduate, and the usual post-graduate research grants after than. The Australian government handed out a lot of Commonwealth Scholarships at that time - most undergraduates got one.

If your parents were poor enough, or if you could demonstrate that you'd supported yourself for three years (as one of my nephews did, much to his - rich - father's amusement) you'd also get a living allowance. My parents had quite enough money to pay my living costs until I'd got the undergraduate degree, but after that the research grant covered both tution and living costs - at about half the level I jave earned if I had been working in industry.

My wife's parents weren't as well off (though too well off to let her collect a living allowance) and she had to reject her Commonwealth Scholarship and take an Education Department studentship, which you paid off by teaching for three years after you graduate. She was good enough that she could pay that off by teaching at university while she did a part-time master's degree

That's your story. I've seen your way with bullshit, and Martin's version strikes me as lot more plausible.

A tensor is just an ordered tuple. Most of us just call them vectors. What your little collection of catagories imply I neither know nor care. You may think that incomplete expositions suggest that you have privileged access to esoteric knowledge, but everybody here has acess to esoteric knowledge, and most of us manage to refer to it in ways that let our readers know what we are talking about. Your enthusiasm for making a mystery of what you claim to understand merely labels you as a bullshit artist.

Probably not. I never went in for pretentious bullshit - my preference was more to call a spade a bloody shovel - and my preferred hypothesis makes me unemployable because I'm 67. My various personality defects didn't render me unemployable when I was younger and even more obnoxious, so they probably aren't a problem now.

In my dialect, your brothers are male people with whom you share a common father or mother - usually both. More distant relatives are cousins and second cousins.

I certainly accept that we all evolved from a small pool of common ancestors - probably a single tribe of about a hundred people - and are consequently distant cousins. Martin Brown isn't a close enough relative that I'd know him through family connections, which is the usual meaning of the word "related".

He's probably no more - and no less - closely related to me than you are, which is a depressing thought.

-- Bill Sloman, Nijmegen

ood

It is if they are legally bound to underestimate my expectation of life.

And I don't share your particular aversion for "the government" as a pension fund holder. I doubt if they are going to do any worse that the non-government institution that looks after my professional earning-related pension funds. My Australian investment advisor would probably do a better job per dollar that he got to invest, but not after you've figured in the tax advantages the pension funds get.

-- Bill Sloman, Nijmegen

e at

or

All true. But it worked. More modern procedures are quicker and easier, but don't necessarily give more reliable results.

-- Bill Sloman, Nijmegen

...and they couldn't possibly change the rules after the game starts. No, governments would *never* do that.

What clueless gibberish!

You missed it AGAIN.

It WAS accurate enough, idiot.

You "haven't got a clue".

YOU were claiming as much as 5 degrees offset.

His method could in no way be that far off, even if executed with a slight imperfection in procedure and or method.

Wanna bet?

His method over the boiling water could not be far off enough to throw his instrument, AT ITS ACCURACY LEVEL, off.

You were the one talking about granularity, resolution, and accuracy.

There is no need to calibrate something like it has 5.5 digits in the display and resolve, when all it has is 1.5 digits.

You calibrate out at "ZERO Intelligence", yet we tolerate you.

We also know right at what level you pump your stupid lip service at.

That level hovers right near zero as well.

You also have began acting like the retarded trolls, with your "snipped this" and snipped that" with an added snide remark.

Yeah, yer a real prize, sniptard. If I ever visited that land, I would want to come over and beat the piss out of you while declaring that "your stupidity is being snipped from the world..."

Wrong.

You ain't real bright. Calibration lamps are.

The question is are you mart enough to know what spectrum they radiate at, and what temperature.

Not bad. The RTDs I have worked with were usually 100 ohms which would have been pretty disastrous! There were a few 1k types too.

You could just junk the switch altogether and let the micro do a slightly more complicated calculation on the mark/space ratio. If we charge through Rt+Rref, and discharge through Rref, then Ton/Toff = (Rt+Rref)/Rref. So Rt = Rref(Ton/Toff-1). In other words just the standard 555 oscillator circuit with Rref and Rt as the two timing resistors.