any way to calibrate digital thermometer?

[John Robertson]

Jeff Liebermann wrote:

On Tue, 29 May 2012 22:00:36 -0700, John Robertson <spam@flippers.com
wrote:

So is that how some researchers get accuracy to .001 using
hundreds/thousands of devices calibrated to 0.1?

They probably bribed the peer reviewers or made some manner of quid
pro quo deal. The lab assistant that ran the numbers probably didn't
care about signifigant figures or the difference between resolution
and accuracy. If it fits in the speadsheet box, it must be correct.

Incidentally, at 0.001C resolution, the heat emitted by the observer
becomes signifigant.

I'll confess to having done the ice and boiling water calibration
ceremony to various thermometers while in college, but not to a
wireless sensor.
http://www.in.gov/isdh/files/ThermometerCalibration__3_.pdf
Put the sensor in a baggie and suck the air out then see how it measures
up...

If you let everything equalize to ambient temperature, you'll
eventually get an accurate reading. Incidentally, many black plastic
shipping bags are somewhat transparent to IR.

I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
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[mike]

On 5/30/2012 11:06 AM, John Robertson wrote:

Jeff Liebermann wrote:
On Tue, 29 May 2012 22:00:36 -0700, John Robertson <spam@flippers.com
wrote:

So is that how some researchers get accuracy to .001 using
hundreds/thousands of devices calibrated to 0.1?

They probably bribed the peer reviewers or made some manner of quid
pro quo deal. The lab assistant that ran the numbers probably didn't
care about signifigant figures or the difference between resolution
and accuracy. If it fits in the speadsheet box, it must be correct.

Incidentally, at 0.001C resolution, the heat emitted by the observer
becomes signifigant.

I'll confess to having done the ice and boiling water calibration
ceremony to various thermometers while in college, but not to a
wireless sensor.
http://www.in.gov/isdh/files/ThermometerCalibration__3_.pdf
Put the sensor in a baggie and suck the air out then see how it
measures up...

If you let everything equalize to ambient temperature, you'll
eventually get an accurate reading. Incidentally, many black plastic
shipping bags are somewhat transparent to IR.


I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

John :-#)#

This is a bad idea on many levels.

Check the operating temperature range. it's unlikely that it included
100C.
Even if it survives...
Most electronic temperature measurement methods rely on some form
of linearization. Calibrating at twice the intended operating temperature
range is unlikely to improve the readings at normal temps.

Do the math on boiling temperature. You've just converted your
inability to measure temperature into an inability to measure
atmospheric pressure.

 

[hr(bob) hofmann@att.net]

On May 30, 1:06 pm, John Robertson <s...@flippers.com> wrote:

Jeff Liebermann wrote:
On Tue, 29 May 2012 22:00:36 -0700, John Robertson <s...@flippers.com
wrote:

So is that how some researchers get accuracy to .001 using
hundreds/thousands of devices calibrated to 0.1?

They probably bribed the peer reviewers or made some manner of quid
pro quo deal.  The lab assistant that ran the numbers probably didn't
care about signifigant figures or the difference between resolution
and accuracy.  If it fits in the speadsheet box, it must be correct.

Incidentally, at 0.001C resolution, the heat emitted by the observer
becomes signifigant.

I'll confess to having done the ice and boiling water calibration
ceremony to various thermometers while in college, but not to a
wireless sensor.
http://www.in.gov/isdh/files/ThermometerCalibration__3_.pdf
Put the sensor in a baggie and suck the air out then see how it measures
up...

If you let everything equalize to ambient temperature, you'll
eventually get an accurate reading.  Incidentally, many black plastic
shipping bags are somewhat transparent to IR.

I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

John :-#)#

--
    (Please post followups or tech enquiries to the newsgroup)
  John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
  Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
                     www.flippers.com
       "Old pinballers never die, they just flip out."- Hide quoted text -

- Show quoted text -

Boiling water will soften the plastic bag (if it's anything like the
plastic bags we get around here for groceries) to the point that a
leak is almost sure to happen.

 

[John Robertson]

hr(bob) hofmann@att.net wrote:

On May 30, 1:06 pm, John Robertson <s...@flippers.com> wrote:
Jeff Liebermann wrote:
On Tue, 29 May 2012 22:00:36 -0700, John Robertson <s...@flippers.com
wrote:
So is that how some researchers get accuracy to .001 using
hundreds/thousands of devices calibrated to 0.1?
They probably bribed the peer reviewers or made some manner of quid
pro quo deal. The lab assistant that ran the numbers probably didn't
care about signifigant figures or the difference between resolution
and accuracy. If it fits in the speadsheet box, it must be correct.
Incidentally, at 0.001C resolution, the heat emitted by the observer
becomes signifigant.
I'll confess to having done the ice and boiling water calibration
ceremony to various thermometers while in college, but not to a
wireless sensor.
http://www.in.gov/isdh/files/ThermometerCalibration__3_.pdf
Put the sensor in a baggie and suck the air out then see how it measures
up...
If you let everything equalize to ambient temperature, you'll
eventually get an accurate reading. Incidentally, many black plastic
shipping bags are somewhat transparent to IR.
I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."- Hide quoted text -

- Show quoted text -

Boiling water will soften the plastic bag (if it's anything like the
plastic bags we get around here for groceries) to the point that a
leak is almost sure to happen.

Well, there are bags that are proof to 100C, folks boil their lunch in
them...

However the point was raised about the survivability of the unit to
100C. I was actually only thinking of exposing the sensor to the hot
water, not the module. Again, I need to be clearer in my descriptions.

Sigh.

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

[Jeff Liebermann]

On Wed, 30 May 2012 11:06:43 -0700, John Robertson <spam@flippers.com>
wrote:

I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

Boiling Water in a Plastic Bag
<http://www.youtube.com/watch?v=9zFo3vQAIeM>

Boiling water in a paper cup
<http://www.youtube.com/watch?v=xGseQk_r9EI>
<http://www.youtube.com/watch?v=lFL2B_14sLc>

As long as the water keeps the plastic bag and paper cup temperature
below the plastic melt or paper ignition points, there's no problem.

Quiz: What's the difference in water temperature between a slow boil
and a fast rolling boil?
Answer: None.
Moral: It doesn't pay to bring the tea kettle to a violent rolling
boil because the tea will not get any hotter than 100C (at STP).


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Jeff Liebermann]

On Wed, 30 May 2012 13:02:53 -0700, mike <spamme9@gmail.com> wrote:

Do the math on boiling temperature. You've just converted your
inability to measure temperature into an inability to measure
atmospheric pressure.

Boiling Points of Water at Various Elevations
<http://www.engineeringtoolbox.com/boiling-points-water-altitude-d_1344.html>

Roughly a 1C drop in the boiling point for a 1000ft gain in altitude.
No need to measure atmospheric pressure. You can read your altitude
from a topo map, compensate for the boiling point, and still be quite
accurate at calibrating the thermometer. The effects of atmospheric
pressure are negligible:
<http://wiki.answers.com/Q/How_does_the_elevation_and_air_pressure_affect_the_boiling_point_of_water>
Unless there's a hurricane coming, the typical changes in atmospheric
pressure might change the boiling point over a +/-1C range.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[isw]

In article <9vqds79jt9a8ngrd5oslcu9svftm8tu8lm@4ax.com>,
Jeff Liebermann <jeffl@cruzio.com> wrote:

On Wed, 30 May 2012 11:06:43 -0700, John Robertson <spam@flippers.com
wrote:

I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

Boiling Water in a Plastic Bag
http://www.youtube.com/watch?v=9zFo3vQAIeM

Boiling water in a paper cup
http://www.youtube.com/watch?v=xGseQk_r9EI
http://www.youtube.com/watch?v=lFL2B_14sLc

As long as the water keeps the plastic bag and paper cup temperature
below the plastic melt or paper ignition points, there's no problem.

Quiz: What's the difference in water temperature between a slow boil
and a fast rolling boil?
Answer: None.
Moral: It doesn't pay to bring the tea kettle to a violent rolling
boil because the tea will not get any hotter than 100C (at STP).

But it can (depending on the local barometric pressure) be enough lower
to mess up an otherwise good calibration run ...

Isaac

 

[isw]

In article <jq5ue2$cih$1@dont-email.me>, mike <spamme9@gmail.com>
wrote:

On 5/30/2012 11:06 AM, John Robertson wrote:
Jeff Liebermann wrote:
On Tue, 29 May 2012 22:00:36 -0700, John Robertson <spam@flippers.com
wrote:

So is that how some researchers get accuracy to .001 using
hundreds/thousands of devices calibrated to 0.1?

They probably bribed the peer reviewers or made some manner of quid
pro quo deal. The lab assistant that ran the numbers probably didn't
care about signifigant figures or the difference between resolution
and accuracy. If it fits in the speadsheet box, it must be correct.

Incidentally, at 0.001C resolution, the heat emitted by the observer
becomes signifigant.

I'll confess to having done the ice and boiling water calibration
ceremony to various thermometers while in college, but not to a
wireless sensor.
http://www.in.gov/isdh/files/ThermometerCalibration__3_.pdf
Put the sensor in a baggie and suck the air out then see how it
measures up...

If you let everything equalize to ambient temperature, you'll
eventually get an accurate reading. Incidentally, many black plastic
shipping bags are somewhat transparent to IR.


I meant to seal the device in a bag and then put in boiling (@ sea
level) or ice water for calibration. Sorry that I wasn't clear enough,
my bad!

John :-#)#

This is a bad idea on many levels.
Check the operating temperature range. it's unlikely that it included
100C.
Even if it survives...
Most electronic temperature measurement methods rely on some form
of linearization. Calibrating at twice the intended operating temperature
range is unlikely to improve the readings at normal temps.

Do the math on boiling temperature. You've just converted your
inability to measure temperature into an inability to measure
atmospheric pressure.

The friendly folks at the local airport will do that for you, and put
the results on the internet ...

Isaac

 

[Jeff Liebermann]

On Wed, 30 May 2012 21:40:45 -0700, isw <isw@witzend.com> wrote:

But it can (depending on the local barometric pressure) be enough lower
to mess up an otherwise good calibration run ...

Having done the boiling water thermometer calibration exercise, I can
assure you that there are a wide variety of other screwups available.

For example, the temperature of the steam above the boiling water is
at a higher temperature than 100C. With a stick type thermometer,
that puts the bimetallic spring out of the water and into the steam.
The result is a botched calibration. However, if you're a typical
freshman fizzix student, that error can be eliminated by totally
immersing the stick thermometer, at the expense of the thermometer,
which doesn't work very well full of water.

Another is slow versus fast boil. While there's no difference in
water temperature between a slow and fast boil, the fast boil does
contain a much larger number of water vapor (gas) bubbles than the
slow boil. This water vapor is at a higher temperature than the
surrounding liquid phase water. If the stick thermometer was
sufficiently covered or enclosed by these bubbles, the temperature
will read higher than 100C.

While atmospheric pressure does have an effect, pollutants in the
water also have an effect. Want to raise the boiling point? Just add
salt.

The type of container and method of heating also has a slight effect.



--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[mike]

On 5/30/2012 9:18 PM, Jeff Liebermann wrote:

On Wed, 30 May 2012 13:02:53 -0700, mike<spamme9@gmail.com> wrote:

Do the math on boiling temperature. You've just converted your
inability to measure temperature into an inability to measure
atmospheric pressure.

Boiling Points of Water at Various Elevations
http://www.engineeringtoolbox.com/boiling-points-water-altitude-d_1344.html

Roughly a 1C drop in the boiling point for a 1000ft gain in altitude.
No need to measure atmospheric pressure. You can read your altitude
from a topo map, compensate for the boiling point, and still be quite
accurate at calibrating the thermometer. The effects of atmospheric
pressure are negligible:
http://wiki.answers.com/Q/How_does_the_elevation_and_air_pressure_affect_the_boiling_point_of_water
Unless there's a hurricane coming, the typical changes in atmospheric
pressure might change the boiling point over a +/-1C range.


Well, We don't know where the OP is. I assumed he was concerned about

being off
by 3F. You admit to 3.6F variance due to pressure.
I suggest that it's definitely a factor in increasing the absolute
accuracy of his temp gauge...even if he's in C territory. If I hadn't
mentioned it, I don't think anybody
would have considered that as an error term. And you still don't.

 

[Spehro Pefhany]

On Tue, 29 May 2012 11:36:59 -0400, the renowned "Johnny Appleseed"
<none@nowhere.non> wrote:

I have a digital thermometer like the one here:

http://www.walmart.com/ip/Acurite-Wireless-Thermometer/16888921

The temperature the outdoor sensor reads is at least 3 degrees off from what
it should be. Is there any way to adjust the temperature reading in these
units? The instructions don't say anything about this issue.

Thanks,
John

These type of things use a "precision" thermistor that is supposed to
be good to a degree or so against an internal fixed reference
resistor. There is no individual calibration. You could try to trim
the reference resistor, but personally I'd f'dget about it. 3 degrees
(F?) could be the difference between being in the sun and not, for
example.

What do you expect for < $10?


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[gregz]

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:

On Tue, 29 May 2012 11:36:59 -0400, the renowned "Johnny Appleseed"
none@nowhere.non> wrote:

I have a digital thermometer like the one here:

http://www.walmart.com/ip/Acurite-Wireless-Thermometer/16888921

The temperature the outdoor sensor reads is at least 3 degrees off from what
it should be. Is there any way to adjust the temperature reading in these
units? The instructions don't say anything about this issue.

Thanks,
John

These type of things use a "precision" thermistor that is supposed to
be good to a degree or so against an internal fixed reference
resistor. There is no individual calibration. You could try to trim
the reference resistor, but personally I'd f'dget about it. 3 degrees
(F?) could be the difference between being in the sun and not, for
example.

What do you expect for < $10?


Best regards,
Spehro Pefhany

I got two different devices with fairly constant 3 degree difference. My
one with wind gauge, I don't believe. I think it reads half. I'm going to
take it for a ride some day.
One transmitter failed after a few years. Bought replacement. I have other
cheap units go bad, but my current models are half decent.

Greg

 

[Jim Yanik]

gregz <zekor@comcast.net> wrote in
news:1440918946360210418.064940zekor-comcast.net@news.eternal-september.o
rg:

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:
On Tue, 29 May 2012 11:36:59 -0400, the renowned "Johnny Appleseed"
none@nowhere.non> wrote:

I have a digital thermometer like the one here:

http://www.walmart.com/ip/Acurite-Wireless-Thermometer/16888921

The temperature the outdoor sensor reads is at least 3 degrees off
from what it should be. Is there any way to adjust the temperature
reading in these units? The instructions don't say anything about
this issue.

Thanks,
John

These type of things use a "precision" thermistor that is supposed to
be good to a degree or so against an internal fixed reference
resistor. There is no individual calibration. You could try to trim
the reference resistor, but personally I'd f'dget about it. 3 degrees
(F?) could be the difference between being in the sun and not, for
example.

What do you expect for < $10?


Best regards,
Spehro Pefhany

I got two different devices with fairly constant 3 degree difference.
My one with wind gauge, I don't believe. I think it reads half. I'm
going to take it for a ride some day.
One transmitter failed after a few years. Bought replacement. I have
other cheap units go bad, but my current models are half decent.

Greg

My WalMart $10 Acurite wireless remote thermometer also seems to read about
that high.
it's on my covered,screened patio,out of direct sun,and sheltered.

FYI,real cal labs use a platinum platinum-rhodium resistance thermometer
with a correction chart(from NIST) for really precise temp calibrations.
We had a temp-controlled circulating mineral oil bath in which to put the
DUT and reference thermometer.
I used to do that in the USAF.(PMEL)

--
Jim Yanik
jyanik
at
localnet
dot com

 

[gregz]

Jim Yanik <jyanik@abuse.gov> wrote:

gregz <zekor@comcast.net> wrote in
news:1440918946360210418.064940zekor-comcast.net@news.eternal-september.o
rg:

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:
On Tue, 29 May 2012 11:36:59 -0400, the renowned "Johnny Appleseed"
none@nowhere.non> wrote:

I have a digital thermometer like the one here:

http://www.walmart.com/ip/Acurite-Wireless-Thermometer/16888921

The temperature the outdoor sensor reads is at least 3 degrees off
from what it should be. Is there any way to adjust the temperature
reading in these units? The instructions don't say anything about
this issue.

Thanks,
John

These type of things use a "precision" thermistor that is supposed to
be good to a degree or so against an internal fixed reference
resistor. There is no individual calibration. You could try to trim
the reference resistor, but personally I'd f'dget about it. 3 degrees
(F?) could be the difference between being in the sun and not, for
example.

What do you expect for < $10?


Best regards,
Spehro Pefhany

I got two different devices with fairly constant 3 degree difference.
My one with wind gauge, I don't believe. I think it reads half. I'm
going to take it for a ride some day.
One transmitter failed after a few years. Bought replacement. I have
other cheap units go bad, but my current models are half decent.

Greg


My WalMart $10 Acurite wireless remote thermometer also seems to read about
that high.
it's on my covered,screened patio,out of direct sun,and sheltered.

FYI,real cal labs use a platinum platinum-rhodium resistance thermometer
with a correction chart(from NIST) for really precise temp calibrations.
We had a temp-controlled circulating mineral oil bath in which to put the
DUT and reference thermometer.
I used to do that in the USAF.(PMEL)

Oh, I remember PMEL. Had one on NASA site. I used to make do with what I
had, and accuracy necessity, in a research design, and repIr shop.

Greg

 

[Shaun]

"Johnny Appleseed" <none@nowhere.non> wrote in message
news:jq2qes$hn$1@dont-email.me...

I have a digital thermometer like the one here:

http://www.walmart.com/ip/Acurite-Wireless-Thermometer/16888921

The temperature the outdoor sensor reads is at least 3 degrees off from
what it should be. Is there any way to adjust the temperature reading in
these units? The instructions don't say anything about this issue.

Thanks,
John

You bought it at Wal-Mart and you're surprised that it is not accurate??
Duhhhhhhhhh!
3 degrees is not bad for something that sells for less than $10.00
stupid!!!

 

I have an Acurite with outdoor sensor that I got as a gift. The indoor is right on, but the outdoor temp is 6-7 degrees LOW based on comparisons with multiple sources including another wired thermometer to the outside, also in the shade. That one always reads exact to my various other sources. It's just annoying and realize I should just replace it but Ive been looking for a weather station that gives me wind speed and direction and something of higher quality but not over 300 to 400$.

 

[Cydrome Leader]

hindsitetrader@sbcglobal.net wrote:
> I have an Acurite with outdoor sensor that I got as a gift. The indoor is right on, but the outdoor temp is 6-7 degrees LOW based on comparisons with multiple sources including another wired thermometer to the outside, also in the shade. That one always reads exact to my various other sources. It's just annoying and realize I should just replace it but Ive been looking for a weather station that gives me wind speed and direction and something of higher quality but not over 300 to 400$.

I use the cheapo radio shack indoor/outdoor thermometers and they drift as
well. When new, the outside probe and inside probe matched, but not
anymore. I think something happened with the insulation of the wire or the
sensor which is potted in a little probe.

 

[mike]

On 12/31/2014 11:12 AM, hindsitetrader@sbcglobal.net wrote:

I have an Acurite with outdoor sensor that I got as a gift. The indoor is right on, but the outdoor temp is 6-7 degrees LOW based on comparisons with multiple sources including another wired thermometer to the outside, also in the shade. That one always reads exact to my various other sources. It's just annoying and realize I should just replace it but Ive been looking for a weather station that gives me wind speed and direction and something of higher quality but not over 300 to 400$.

make sure your sensors are exactly in the same place and shielded from
the wind/sun etc when you compare.
It's noon.
Front sensor reads 34F
Side sensor reads 42F
Back sensor reads 38F
all are in the shade.
If I put them all in the same place at night,
they read within a degree of each other.

I have an Acurite remote thermometer. The clock loses about half
a minute per day. Looks like we agree they're crap.

Make darn sure you have a place to mount your weather station.
I got one on a whim at a garage sale cuz it was free.
Got it home and started looking where I'd mount it.
Turns that there's enough shadow from trees along the back
to block a significant portion of the rain.
And all the swirling from the trees made the wind speed
and direction just random numbers.
Glad I didn't pay $400 for it.

 

[Maynard A. Philbrook Jr.]

In article <d176a781-a6bf-4ffe-9f81-1d30126e305c@googlegroups.com>,
hindsitetrader@sbcglobal.net says...

I have an Acurite with outdoor sensor that I got as a gift. The indoor is right on, but the outdoor temp is 6-7 degrees LOW based on comparisons with multiple sources including another wired thermometer to the outside, also in the shade. That one always reads exact to my various other sources. It's just annoying and realize I should just replace it but Ive been looking for a weather station that gives me wind speed and direction and something of higher quality but not
over 300 to 400$.

Put something over the sensor, maybe it has some self heating and the
wind chill, as little as it maybe is cooling it.

Jamie

 

[Jeff Liebermann]

On Wed, 31 Dec 2014 11:12:46 -0800 (PST), hindsitetrader@sbcglobal.net
wrote:

>I have an Acurite with outdoor sensor that I got as a gift.

Anything that claims to be amazing, magic, miracle, or accurate in the
name, probably isn't. Since you didn't bother providing a model
number, I'll assume you've already given up and are now shopping for a
$300+ weather station. I think you'll find that a decent weather
station (Peet Bros, Davis, etc) are far more expensive. $300 is about
the starting price for a bottom of the line Davis.

The indoor is right on, but the outdoor temp is 6-7 degrees LOW based
on comparisons with multiple sources including another wired thermometer
to the outside, also in the shade. That one always reads exact to my
various other sources. It's just annoying and realize I should just
replace it but Ive been looking for a weather station that gives me
wind speed and direction and something of higher quality but not over
300 to 400$.

There's nothing wrong with the thermometer or sensor. The problem is
location, location, location, and ummm... location. I "manage"
several weather stations and have great difficulties getting
consistent temperature readings. There are standards for locating
sensors which must be followed. I need to run, so here are some
links. Bug me (or post to a weather newsgroup) if lost:

Data quality:
<http://www.wxqa.com/AllenFreeMetQC.pdf>

Citizens weather observer corp, which monitors temp sensor
consistency.
<http://www.wxqa.com>

Radiation shielding:
<http://wxqa.com/shields.html>

Siting:
<https://www.campbellsci.com/weather-station-siting>
<ftp://ftp.campbellsci.com/pub/outgoing/apnotes/siting.pdf>
<http://wxqa.com/resources.html>

gone...
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558