Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 3 / 5   >   >>
Max The Magnificent
User Rank
Author
re: I’m becoming hot and bothered…
Max The Magnificent   11/30/2011 6:22:49 PM
NO RATINGS
Hi Rene -- Re your comment: "...there is always that hot spot or room that everyone gravitates towards..." Well yes, of course, it's wherever I happen to be standing at the time (grin)

ReneCardenas
User Rank
Author
re: I’m becoming hot and bothered…
ReneCardenas   11/30/2011 6:16:29 PM
NO RATINGS
A point that I have not read yet, is the other secondary factors like airflow mass movement that is supposed to equalize the temperature in a closed environemnt. I noticed that in every house that I have lived (over 5), there is always that hot spot or room that everyone gravitates towards. ;-)

Max The Magnificent
User Rank
Author
re: I’m becoming hot and bothered…
Max The Magnificent   11/30/2011 4:40:31 PM
NO RATINGS
I agree -- Pugsley does make a very good point

bcarso
User Rank
Author
re: I’m becoming hot and bothered…
bcarso   11/30/2011 4:24:07 PM
NO RATINGS
Hahaaa!! But pugsley does make a very good point. What is comfortable? And this will have much to do with one's metabolism and circulation. Under normal conditions of physical activity and diet I can estimate the air temp to about half a degree F. I'm presuming here that the walls are also about the air temp, so the radiative contribution is consistent. But a touch of illness or a sharp reduction in fuel food and I'm feeling cold in ambients of, say, 73 F. And my estimates of temperature are way off, unless I knowingly compensate.

Max The Magnificent
User Rank
Author
re: I’m becoming hot and bothered…
Max The Magnificent   11/29/2011 2:47:06 PM
NO RATINGS
But I don't want another ice bath ... I've been a good boy ... honest!!!

David Ashton
User Rank
Author
re: I’m becoming hot and bothered…
David Ashton   11/29/2011 4:22:49 AM
NO RATINGS
Ah - here is a man who CAN be bothered to calibrate things with ice baths (if not boiling water..). Brad, can you give Max some lessons please??

zeeglen
User Rank
Author
re: I’m becoming hot and bothered…
zeeglen   11/28/2011 7:13:13 PM
NO RATINGS
Long ago I did weather observing in the Arctic using liquid in glass tube thermometers mounted outdoors. We were supposed to read the liquid to within 0.1 degree (try doing that at 40 below and your eyes streaming from the wind blasting). Each thermometer had a serial number and a conversion chart for correction. If I recall correctly the reading error could be as large as 0.5 degrees (can't remember if F or C) and the chart had a curve that indicated reading vs true corrected temperature. This was long before electronics was accurate to 0.1 degrees F.

bcarso
User Rank
Author
re: I’m becoming hot and bothered…
bcarso   11/28/2011 6:25:19 PM
NO RATINGS
I bought a "scientific" thermometer years ago which has a long stainless probe that protrudes, and has a resolution of 0.1 degree F. It seems to have kept its calibration over the years, although I can't test it with boiling water as the highest reading before it overranges is 140. A ice and water slurry would be at least one check though. When my late mother once stayed with me when I rented a guest house in Malibu, she was complaining of being cold until I used some electric heaters (I think for the first time) and brought the temperature up to about 85F according to the scientific thermometer. Insanely hot for me, and I pointed out to her how warm it measured. She said Oh that's ridiculous --- it's not that hot in here! And besides, that's a MEAT thermometer! :) I've found the National Semi temp sensors like the LM35 to be at least in good agreement with the scientific thermometer. Another approach that I saw in the Review of Scientific Instruments years ago was to separately measure a resistor's open-circuit voltage noise, then the virtually-shorted current noise, and back out the temperature (needless to say the bandwidths have to be accurately determined, and the noise of the preamps similarly well-characterized). But the cool thing (indeed this was presented as a technique suitable for cryogenic apps) is that the actuall resistance value drops out in the analysis. Brad

Max The Magnificent
User Rank
Author
re: I’m becoming hot and bothered…
Max The Magnificent   11/28/2011 4:49:39 PM
NO RATINGS
This is a very good point ... I will ponder this...

Darius Pl.
User Rank
Author
re: I’m becoming hot and bothered…
Darius Pl.   11/27/2011 2:30:37 PM
NO RATINGS
I have heard that this is done intentionally. Most private cars have this 5 km/h offset.

<<   <   Page 3 / 5   >   >>


Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

ESC Minneapolis 2015 Sneak Peek! Baking Pis in Africa
Max Maxfield
Post a comment
One of the great things about my job is that so many interesting people get to meet me I get to meet so many interesting people (LOL). For example, I just received an email from Kurtis ...

Bernard Cole

A Book For All Reasons
Bernard Cole
1 Comment
Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...

Martin Rowe

Leonard Nimoy, We'll Miss you
Martin Rowe
5 comments
Like many of you, I was saddened to hear the news of Leonard Nimoy's death. His Star Trek character Mr. Spock was an inspiration to many of us who entered technical fields.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Flash Poll