Temperature measurement

If you want the filament to be in a well-defined place - and to stay put in that place despite you heating it up to incandescent temperatures, you do need a specialised mechanical construction to support it.

That you can't articulate this particular constraint, and gibber on about "calibration" is a fair indication of your ignorance about the area.

-- Bill Sloman, Nijmegen

Like many other things you think you know, this doesn't happen to be true.

I didn't state any particular accuracy. Neither have you.

In general, _private_ fund managers in the US aren't much better than flipping coins. I recently read a book by a physicist, Leonard Mlodinow:

He suggests an interesting point to consider on the idea that fund managers are worth much.

Anyone can read about it by clicking on the "search inside this book" selection underneath the book front cover showing there and searching for the phrase, "800 mutual fund managers." Then read that page (198) and the next one (199.) Charts on both tell the story quite quickly, but the text is worth a shot, as well.

Jon

Do you think if you apologize hard enough he'll recommend a drop in replacement for the 555? :-)

Ed

That is eaxctly what I did for production.

There was a PIC app note for this going back to the early 90s.

On the PIC16C54 I used TMR0 as PIO0 because it had a schmidt input. When the idea was used with a PIC16F628 I used a comparator input.

We achieved better than 0.1% which was our spec. I can't remember how much better. Most measurements techniques are limited by supply noise. I did an average of 8 readings.

I used this technique along with a variable frequency oscillator controlled by an RH sensor for an A to D free RH and temperature transmitter.

Maybe, although e.g. the delta-sigma ADCs are amazingly good even in the presence of noise. Bills recommendation on this thread IIRC.

I'm not sure what the ultimate limit of this technique would be. Supply noise could be averaged out except where it is caused by the switching process. The comparator may be largely immune anyway since both inputs can be referenced to a low noise ground.

--

John Devereux

You should make more because you read one more book than the other class?

I prefer real field experience.

I was talking about compensation circuitry in the circuit that reads the transducer, idiot. You have the tiny mind.

In our IR device, for example, there is the resistor bolometer, and the spectral window where required, which can be incorporated into the lens itself in some cases. Along with that bolometer transducer is circuitry which reads what one points the optics at.

They get calibrated in our lab at a specific ambient temperature for the entire unit, so any reading derived from it in the field will only be truly accurate at that temperature, and we sell water (glycol) cooled jackets that go around our instruments that industrial customers all over the world use to keep there instrument at a proper temp while observing quite hostile temps from quite hostile perches.

Nonetheless, we do have compensation circuitry, and calibration procedures for that circuitry that allow our instruments to track properly calibrated responses to what the optics are pointed at despite the temperature of the instrument itself shifting. Our handhelds all have ambient compensation.

You obviously have none.

HV resistors are not made, nor trimmed as a batch.

Shut the f*ck up about that which you know nothing about, Sloman.

You don't even know how to get chaos right.

Twice I give you facts and the first one you call implausible, and now you are calling it some other stupid "I'm smarter than you" jab horseshit, when in fact, you are NOT smarter than anyone here.

You're so goddamned stupid that you don't even know who FLIR is, much less what being their calibration panel supplier means. Then, there are the entire lines of calibration instruments made there.

You're the one full of gibberish, old man. You're lost.

Me? I know who Planck was.

More likely yours. The bulb is specifically manufactured to be mounted in such a way (vertical) that the heating of the specially sized, shaped, and cut filament, and its suspension hardware inside the tube, all keep the filament right where it needs to be, to be the proper 'source' it needs to be, to be a calibration tool for science and industry. Once we box it all up and put pid controllers on it, etc., etc.

Fuck you, Sloman, you're a loser, again.

Sloman is a goddamned idiot, again.

If IR is so bad at it, why do the police in the whirly bird lock right in on the range of temperature they need to discern cannabis from regular ground foliage, when the difference in temp is very slight?

You are not all that precise, sloman.

BTW, idiot, that IS a statement about particular accuracy. By referring to it as expensive, you immediately also imply that it is 'better' as well, because folks do not pay for something 'not all that precise' at a premium price.

Well... then again... someone did once hire you. Bet he regretted that move, and I'll bet that even if it was minimum wage, it was a premium price for your work product.

So, what you REALLY you said IS "particularly expensive".

AND you ALSO REALLY said "particularly inaccurate".

And I said that you are wrong on both counts. You have a snipping problem, Sloman. You are a pussy.

So much for theory:

Of the world's 20 richest people, the most common educational levels seem to be "dropout" and BA.

John

Geez, Bill. He said the single 10G is less _likely_ to be right on the money than the 10 x 1G setup. What is the probability that a single

10G will have a Gaussian distribution? None. Zero. Impossible. _No_ distribution. Ergo, the 10G which _cannot_ have a distribution is less _likely_ to be right on the money than the 10 x 1G setup which can. Just as he said. Your "only if" does not apply to what he said.

Is that the same thinking you use to declare the 555 obsolete? Twist the issue slightly, then attack a point that was not made? It sure seems so. And regarding your antipathy toward the 555, until you post an equivalent 8 pin chip, you are just plain wrong. There's no question that you can specify a bunch of chips or discretes that can perform the various functions incorporated in the 555 better than the 555 does, but the only valid comparison would be to do it in an

8 pin package. Do you understand that?

Ed

g 10G

They

ow

What what has that got to do with Guassiona distributions? You do seem to have mastered "chaos" in the sense of producing erratic and irrelevant responses to stuff posted here, but your sole utility would seem to be as an example of a random (or at least erratic) process.

-- Bill Sloman, Nijmegen

All of them irrelevant.

Try and get a grip on what constitutes a "fact" and work out the difference between that and wishful thinking. You'd like to think I am not smarter than you, but the reverse happens to be true. Pretty much everyobody who posts here is smarter than you - with the possible exception of krw.

e

and you are one of their less intelligent tecnicians. Big deal.

Who doesn't?

-- Bill Sloman, Nijmegen

nted

e

Congratulations, you found your company's sales literature and copied some of it here.

I'm a loser? I've persuaded you to give us something minimally informative for once. With another decade of tutoring you might pass for dim.

-- Bill Sloman, Nijmegen

You obviously cannot read. I never said anything about being a technician anywhere, much less there. I did mention that they were a customer.

Your capacity to actually comprehend what you read is nil.

You are not a big deal. You are fast moving toward being completely ignored, asshole.