Re: Auto Digital Tire Pressure Gauge Survey

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A

AZGuy

Guest
On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:

>
>> I am trying to do a survey on driver's willingness of purchasing a
>> Digital Tire Pressure Gauge, to ensure driving safety.
>
>http://www.getagauge.com/
>
>Can't do much better than these - $10, and more accurate than digital.
>Best for digital is supposedly .5 lbs.
>I'm all in favor of getting a good quality gauge and using it, but
>don't think digital is it.
>Got one as a gift, and stays in the trunk for emergencies only.


Is that a joke? You'd be lucky if those mechanical gauges were
accurate to even a pound and a couple drops could ruin what accuracy a
mechanical gauge did have. You can definitely do better. with
digital. Not to mention that it's pretty easy to find a digital gauge
that's at or under $10.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the
establishment of a standing army, the bane of liberty. . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins." -- Debate, U.S. House
of Representatives, August 17, 1789
 
AZGuy proclaimed:

> On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:
>
>
>>>I am trying to do a survey on driver's willingness of purchasing a
>>>Digital Tire Pressure Gauge, to ensure driving safety.
>>
>>http://www.getagauge.com/
>>
>>Can't do much better than these - $10, and more accurate than digital.
>>Best for digital is supposedly .5 lbs.
>>I'm all in favor of getting a good quality gauge and using it, but
>>don't think digital is it.
>>Got one as a gift, and stays in the trunk for emergencies only.
>
>
>
> Is that a joke? You'd be lucky if those mechanical gauges were
> accurate to even a pound and a couple drops could ruin what accuracy a
> mechanical gauge did have. You can definitely do better. with
> digital. Not to mention that it's pretty easy to find a digital gauge
> that's at or under $10.
> --

That misstatement of fact makes the laughably false presumption that
the sensors in an inexpensive digital guage are any more accurate
than the fairly simple mechanisms available for old fashioned
mechanical guages. It also evidences a rather common false
belief that just because something appears to display values at
a higher resolution that it is any more accurate than a possibly
far more accurate display at a lower resolution. Plus a somewhat
challenged grasp of tire inflation where if a pound of absolute
pressure makes any real difference [as opposed to repeatability and
relative pressure] you are driving in a manner where only a fool
would use less than a very very expensive guage.

 
On 19 Dec 2004 13:26:28 -0800, "pater" <[email protected]> wrote:

>First of all, I didn't give you my corporation, if I HAD a corporation,
>I wouldn't give it to anybody. Had a snap-on digital like 10 years ago,
>worked nice, very accurate ( checked it against a mechanical guage,
>which is my preference) .If your in the repair business & check tire
>pressure several times a day, digital is nice (mine had a clock too, so
>you could see how long it was till beer thirty). But upon getting out
>of the trade in that respect, it wound up in the glove box of the
>truck & as little as that got used at that point, I usually found the
>batteries dead whenever I wanted to check the tires. The batteries in
>my mechanical one NEVER go dead. Oh, & to the original poster, "no"

I use both analog and digital as follows:

I use analog to get me a little *over* in pressure, and then the
digital to bleed it down to the precise reading I want. Works for me.

Lg

 
On Sun, 19 Dec 2004 21:31:14 GMT, Lon <[email protected]> wrote:

>AZGuy proclaimed:
>
>> On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:
>>
>>
>>>>I am trying to do a survey on driver's willingness of purchasing a
>>>>Digital Tire Pressure Gauge, to ensure driving safety.
>>>
>>>http://www.getagauge.com/
>>>
>>>Can't do much better than these - $10, and more accurate than digital.
>>>Best for digital is supposedly .5 lbs.
>>>I'm all in favor of getting a good quality gauge and using it, but
>>>don't think digital is it.
>>>Got one as a gift, and stays in the trunk for emergencies only.
>>
>>
>>
>> Is that a joke? You'd be lucky if those mechanical gauges were
>> accurate to even a pound and a couple drops could ruin what accuracy a
>> mechanical gauge did have. You can definitely do better. with
>> digital. Not to mention that it's pretty easy to find a digital gauge
>> that's at or under $10.
>> --
>
> That misstatement of fact makes the laughably false presumption that
> the sensors in an inexpensive digital guage are any more accurate
> than the fairly simple mechanisms available for old fashioned
> mechanical guages. It also evidences a rather common false
> belief that just because something appears to display values at
> a higher resolution that it is any more accurate than a possibly
> far more accurate display at a lower resolution. Plus a somewhat
> challenged grasp of tire inflation where if a pound of absolute
> pressure makes any real difference [as opposed to repeatability and
> relative pressure] you are driving in a manner where only a fool
> would use less than a very very expensive guage.

Baloney. Even a $20 electronic watch will actually keep better time
than a $3000 Rolex. Don't believe me? I can provide the proof.

Digital is the way to go for not only precise readings, but accurate
ones as well.

Lg

 
Lawrence Glickman proclaimed:

> Baloney. Even a $20 electronic watch will actually keep better time
> than a $3000 Rolex. Don't believe me? I can provide the proof.

Perhaps. Depends on the accuracy of the timing engine and whether it
drifts or not. Most use a fairly cheap timing engine much like that
in a typical PC, and the watch doesn't typically come with NTP
service.
>
> Digital is the way to go for not only precise readings, but accurate
> ones as well.

One word, bull. Commonly believed bull, but still bull.
 
On Sun, 19 Dec 2004 23:53:22 GMT, Lon <[email protected]> wrote:

>Lawrence Glickman proclaimed:
>
>> Baloney. Even a $20 electronic watch will actually keep better time
>> than a $3000 Rolex. Don't believe me? I can provide the proof.
>
> Perhaps. Depends on the accuracy of the timing engine and whether it
> drifts or not. Most use a fairly cheap timing engine much like that
> in a typical PC, and the watch doesn't typically come with NTP
> service.
>>
>> Digital is the way to go for not only precise readings, but accurate
>> ones as well.
>
> One word, bull. Commonly believed bull, but still bull.

I'll go 50/50 with you on this.
I am dead-on with the comparison between a $3000 Rolex which a friend
has and drifts 15 minutes / day, and the Timex digital I have, that
drifts 15 minute a YEAR! Dead on about that, and he will admit to it.

Now for the ultimate in analog gauges, I have a Tychos on my blood
pressure monitor, and -that- is the *industry standard.* No stop
pins, just a *zero zone.* It is as accurate as a mercury
sphygmomanometer. Calibrated.

But that cost big bucks, I assure you. I know, because I bought it
myself.

Most analog gauges you're going to get for car tires are ****. You
know if you bought it for $7.50, it cost them 35 cents to manufacture
it.

Digital uses a pressure transducer that turns pressure into a voltage
that is read-out as PSI. Chances of these being crap are minimal.

I haven't done any tests with them yet, because it seems a waste of
time, but I think dollar for dollar, digital beats analog hands down
every time.

We need to do a test under controlled labarotory conditions, and then
I can prove it beyond all doubt.

Lg

 
Lawrence Glickman proclaimed:


> I'll go 50/50 with you on this.
> I am dead-on with the comparison between a $3000 Rolex which a friend
> has and drifts 15 minutes / day, and the Timex digital I have, that
> drifts 15 minute a YEAR! Dead on about that, and he will admit to it.

Too small a sample to make an unwarranted blanket statement. Worse,
your friend's Rolex needs service. A Rolex should be more like 1 to
5 seconds per day for a purely mechanical version of a chronometer.
Not unusual for a Tag Heuer chronometer to be within a matter of
a few seconds per year. But then not that unusual for a Seiko to
be just as accurate for a lot less money.

Which has, as the british would say, sod all to do with tire guages.


>
> Now for the ultimate in analog gauges, I have a Tychos on my blood
> pressure monitor, and -that- is the *industry standard.* No stop
> pins, just a *zero zone.* It is as accurate as a mercury
> sphygmomanometer. Calibrated.

Which has sod all to do with tire guages as well.

>
> Most analog gauges you're going to get for car tires are ****. You
> know if you bought it for $7.50, it cost them 35 cents to manufacture
> it.

Or you could buy a good calibrated bourdon tube style dial tire guage
for a relatively modest price. Accuracy of half a pound or so.
However, absolute accuracy isn't needed for street auto tires and
not that many vehicles are tightly wound enough to really be that
big a deal to be half a pound or so off in tire to tire pressure.
>
> Digital uses a pressure transducer that turns pressure into a voltage
> that is read-out as PSI. Chances of these being crap are minimal.

That pressure transducer is mechanical. And as for digital readouts
being crap, you are exposing your lack of knowledge in that area.
Just because you see a digital value doesn't mean it is accurate.
There are a lot of cheap crap digital guages out there.
>
> I haven't done any tests with them yet, because it seems a waste of
> time, but I think dollar for dollar, digital beats analog hands down
> every time.

What you mean is you haven't tested them, and are unfamiliar with the
technology of not only the sensors but the accuracy of cheap digital
devices.
>
> We need to do a test under controlled labarotory conditions, and then
> I can prove it beyond all doubt.

"We" have calibrated hundreds of bourdon tube pressure transducers
against temperature corrected mercury columns for a living. And
no, you won't be able to prove it.


 
On Mon, 20 Dec 2004 01:39:27 GMT, Lon <[email protected]> wrote:

>Lawrence Glickman proclaimed:
>
>
>> I'll go 50/50 with you on this.
>> I am dead-on with the comparison between a $3000 Rolex which a friend
>> has and drifts 15 minutes / day, and the Timex digital I have, that
>> drifts 15 minute a YEAR! Dead on about that, and he will admit to it.
>
> Too small a sample to make an unwarranted blanket statement. Worse,
> your friend's Rolex needs service. A Rolex should be more like 1 to
> 5 seconds per day for a purely mechanical version of a chronometer.
> Not unusual for a Tag Heuer chronometer to be within a matter of
> a few seconds per year. But then not that unusual for a Seiko to
> be just as accurate for a lot less money.
>
> Which has, as the british would say, sod all to do with tire guages.
>
>
>>
>> Now for the ultimate in analog gauges, I have a Tychos on my blood
>> pressure monitor, and -that- is the *industry standard.* No stop
>> pins, just a *zero zone.* It is as accurate as a mercury
>> sphygmomanometer. Calibrated.
>
> Which has sod all to do with tire guages as well.
>
>>
>> Most analog gauges you're going to get for car tires are ****. You
>> know if you bought it for $7.50, it cost them 35 cents to manufacture
>> it.
>
> Or you could buy a good calibrated bourdon tube style dial tire guage
> for a relatively modest price. Accuracy of half a pound or so.
> However, absolute accuracy isn't needed for street auto tires and
> not that many vehicles are tightly wound enough to really be that
> big a deal to be half a pound or so off in tire to tire pressure.
>>
>> Digital uses a pressure transducer that turns pressure into a voltage
>> that is read-out as PSI. Chances of these being crap are minimal.
>
> That pressure transducer is mechanical. And as for digital readouts
> being crap, you are exposing your lack of knowledge in that area.
> Just because you see a digital value doesn't mean it is accurate.
> There are a lot of cheap crap digital guages out there.
>>
>> I haven't done any tests with them yet, because it seems a waste of
>> time, but I think dollar for dollar, digital beats analog hands down
>> every time.
>
> What you mean is you haven't tested them, and are unfamiliar with the
> technology of not only the sensors but the accuracy of cheap digital
> devices.
>>
>> We need to do a test under controlled labarotory conditions, and then
>> I can prove it beyond all doubt.
>
> "We" have calibrated hundreds of bourdon tube pressure transducers
> against temperature corrected mercury columns for a living. And
> no, you won't be able to prove it.
>

All of your *spew* has **** all to do with tire pressure gauges.
NOBODY USES BOURDON TUBE PRESSURE TRANSDUCERS in tire pressure gauges
!

Nice you have that hobby, but it has sod to do with the subject at
hand !

Lg

 
Lawrence Glickman proclaimed:


> Now for the ultimate in analog gauges, I have a Tychos on my blood
> pressure monitor, and -that- is the *industry standard.* No stop
> pins, just a *zero zone.* It is as accurate as a mercury
> sphygmomanometer. Calibrated.

Mercury pressure guages need to be compensated for temp... a good
anaeroid barometer is typically calibrated against the mercury one
every 8 hours. However, these are for measuring pressure in the
millibar range, figure just over 1000 millibars for 30 inches of
mercury [1016 mb is a bit more accurate].

> Most analog gauges you're going to get for car tires are ****. You
> know if you bought it for $7.50, it cost them 35 cents to manufacture
> it.

You can get a reasonably serviceable bourdon style mechanical guage
for well under a hundred dollars. These need relatively little
adjustment for temperature except at the extremes. Some take shock
better than others... and the better ones are accurate to within
0.5 psi of absolute reading with repeatability way better than that,
which is more important for normal auto tires. You can get these for
10-25 dollars, but after a few bounces off the pavement from 3-4 feet
their absolute accuracy can be off by a coupla pounds. Which still
puts them within the inflation range of pretty much any vehicle if
you go above the low end for handling at some sacrifice in softness.
>
> Digital uses a pressure transducer that turns pressure into a voltage
> that is read-out as PSI. Chances of these being crap are minimal.

Most digital guages use a fairly simple strain guage. The reasonably
priced ones will typically have a bit of correction for temperature
and humidity. Some of the crap ones won't. The really accurate ones
use piezo pressure sensors and are accurate to 1/2% full scale between
roughly 20-80% full scale and cost a few hundred dollars. However you
can also get a pretty good one for under $15 bucks, it won't be as
mechanically robust, won't have as good a valve seal, but is good
enough for most folks.

>
> I haven't done any tests with them yet, because it seems a waste of
> time, but I think dollar for dollar, digital beats analog hands down
> every time.

Very likely, with few exceptions I can think of--for tire guages.

However, none are worth a dime if not used properly on cold tires
regularly.

 
Lawrence Glickman wrote:

> I am dead-on with the comparison between a $3000 Rolex which a friend
> has and drifts 15 minutes / day,

I have a $7 wind up alarm clock I use and I can keep its time within
about a minute every three days.

> and the Timex digital I have, that drifts 15 minute a YEAR!

That's a very inaccurate digital watch. My Seiko SPORTS 150 watch gains
a second per week (or a little less than a minute per year).
 
On Mon, 20 Dec 2004 02:43:24 GMT, Arif Khokar <[email protected]>
wrote:

>Lawrence Glickman wrote:
>
>> I am dead-on with the comparison between a $3000 Rolex which a friend
>> has and drifts 15 minutes / day,
>
>I have a $7 wind up alarm clock I use and I can keep its time within
>about a minute every three days.
>
>> and the Timex digital I have, that drifts 15 minute a YEAR!
>
>That's a very inaccurate digital watch. My Seiko SPORTS 150 watch gains
>a second per week (or a little less than a minute per year).

I paid $20 for this "Ironman" at Kmart. How much did you pay for
yours again? $300? I had a Tag Hauer. Was like wearing a brick on
my wrist. $800 US. Threw it in the garbage ( honest ). Could never
find batteries for it.

If you want the ultimate, get the radiowatch, that auto-synchronizes
with WWV, an atomic clock, one of many that broadcast around the
country. In Europe, they have similar watches. THEN you have the
right time, but the bus will still be late, and the timeclock at work
will still be *off.*

Lg

 
Exposing his ignorance for all to be amazed, Lawrence Glickman proclaimed:

> All of your *spew* has **** all to do with tire pressure gauges.
> NOBODY USES BOURDON TUBE PRESSURE TRANSDUCERS in tire pressure gauges

5 seconds with Google would prove what a ignorant sput you are...as
if it needed proving, plonkbait.
 
On Sun, 19 Dec 2004 15:42:51 -0600, Lawrence Glickman
<[email protected]> wrote:

>On Sun, 19 Dec 2004 21:31:14 GMT, Lon <[email protected]> wrote:
>
>>AZGuy proclaimed:
>>
>>> On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:
>>>
>>>
>>>>>I am trying to do a survey on driver's willingness of purchasing a
>>>>>Digital Tire Pressure Gauge, to ensure driving safety.
>>>>
>>>>http://www.getagauge.com/
>>>>
>>>>Can't do much better than these - $10, and more accurate than digital.
>>>>Best for digital is supposedly .5 lbs.
>>>>I'm all in favor of getting a good quality gauge and using it, but
>>>>don't think digital is it.
>>>>Got one as a gift, and stays in the trunk for emergencies only.
>>>
>>>
>>>
>>> Is that a joke? You'd be lucky if those mechanical gauges were
>>> accurate to even a pound and a couple drops could ruin what accuracy a
>>> mechanical gauge did have. You can definitely do better. with
>>> digital. Not to mention that it's pretty easy to find a digital gauge
>>> that's at or under $10.
>>> --
>>
>> That misstatement of fact makes the laughably false presumption that
>> the sensors in an inexpensive digital guage are any more accurate
>> than the fairly simple mechanisms available for old fashioned
>> mechanical guages. It also evidences a rather common false
>> belief that just because something appears to display values at
>> a higher resolution that it is any more accurate than a possibly
>> far more accurate display at a lower resolution. Plus a somewhat
>> challenged grasp of tire inflation where if a pound of absolute
>> pressure makes any real difference [as opposed to repeatability and
>> relative pressure] you are driving in a manner where only a fool
>> would use less than a very very expensive guage.
>
>Baloney. Even a $20 electronic watch will actually keep better time
>than a $3000 Rolex. Don't believe me? I can provide the proof.
>

If the proof comes in the form that you buy me a digital watch and a
rolex for comparison, count me in!

:p


>Digital is the way to go for not only precise readings, but accurate
>ones as well.
>
>Lg


later,

tom @ www.CarFleaMarket.com



 
Lawrence Glickman wrote:
> Arif Khokar <[email protected]> wrote:

>>>and the Timex digital I have, that drifts 15 minute a YEAR!

>>That's a very inaccurate digital watch. My Seiko SPORTS 150 watch gains
>>a second per week (or a little less than a minute per year).

> I paid $20 for this "Ironman" at Kmart. How much did you pay for
> yours again? $300?

I didn't pay anything for it. My dad got it for me as a gift around 13
or 14 years ago.

In any case, the watch lacks any audio output, only displays the time
with the date (no day or month), and has a simple stopwatch. I honestly
don't think that it was that expensive to begin with. The Casio watch I
had before that had a similar degree of accuracy.

 
On Sun, 19 Dec 2004 21:31:14 GMT, Lon <[email protected]> wrote:

>AZGuy proclaimed:
>
>> On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:
>>
>>
>>>>I am trying to do a survey on driver's willingness of purchasing a
>>>>Digital Tire Pressure Gauge, to ensure driving safety.
>>>
>>>http://www.getagauge.com/
>>>
>>>Can't do much better than these - $10, and more accurate than digital.
>>>Best for digital is supposedly .5 lbs.
>>>I'm all in favor of getting a good quality gauge and using it, but
>>>don't think digital is it.
>>>Got one as a gift, and stays in the trunk for emergencies only.
>>
>>
>>
>> Is that a joke? You'd be lucky if those mechanical gauges were
>> accurate to even a pound and a couple drops could ruin what accuracy a
>> mechanical gauge did have. You can definitely do better. with
>> digital. Not to mention that it's pretty easy to find a digital gauge
>> that's at or under $10.
>> --
>
> That misstatement of fact makes the laughably false presumption that
> the sensors in an inexpensive digital guage are any more accurate
> than the fairly simple mechanisms available for old fashioned
> mechanical guages.

And where is your evidence that they are not? Having compared several
mechanical gauges as well as several digital gauges I've found the
digitals to be far more consist then the mechanical ones.


It also evidences a rather common false
> belief that just because something appears to display values at
> a higher resolution that it is any more accurate than a possibly
> far more accurate display at a lower resolution.

You seem to be confusing precision with accuracy. I have found
digitals to be both accurate AND precise. I have found mechanicals to
be not quite as good on either count when compared to digital.

Plus a somewhat
> challenged grasp of tire inflation where if a pound of absolute
> pressure makes any real difference [as opposed to repeatability and
> relative pressure] you are driving in a manner where only a fool
> would use less than a very very expensive guage.


Again, where is your evidence. Nothing that's been posted is anything
other then opinions and anecdotes. Your's carries no more weight then
any other (mine included).
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the
establishment of a standing army, the bane of liberty. . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins." -- Debate, U.S. House
of Representatives, August 17, 1789
 
On Mon, 20 Dec 2004 03:57:23 GMT, Lon <[email protected]> wrote:

>Exposing his ignorance for all to be amazed, Lawrence Glickman proclaimed:
>
>> All of your *spew* has **** all to do with tire pressure gauges.
>> NOBODY USES BOURDON TUBE PRESSURE TRANSDUCERS in tire pressure gauges
>
> 5 seconds with Google would prove what a ignorant sput you are...as
> if it needed proving, plonkbait.

Well, you beat me too it. It's amazing how "knowledgeable" ol Lon
claimed to be yet doesn't even know how a mechanical tire pressure
gauge works. He must be thinking of those REALLY accurate stick
gauges.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the
establishment of a standing army, the bane of liberty. . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins." -- Debate, U.S. House
of Representatives, August 17, 1789
 
On Mon, 20 Dec 2004 04:58:19 GMT, Arif Khokar <[email protected]>
wrote:

>Lawrence Glickman wrote:
>> Arif Khokar <[email protected]> wrote:
>
>>>>and the Timex digital I have, that drifts 15 minute a YEAR!
>
>>>That's a very inaccurate digital watch. My Seiko SPORTS 150 watch gains
>>>a second per week (or a little less than a minute per year).
>
>> I paid $20 for this "Ironman" at Kmart. How much did you pay for
>> yours again? $300?
>
>I didn't pay anything for it. My dad got it for me as a gift around 13
>or 14 years ago.
>
>In any case, the watch lacks any audio output, only displays the time
>with the date (no day or month), and has a simple stopwatch. I honestly
>don't think that it was that expensive to begin with. The Casio watch I
>had before that had a similar degree of accuracy.

Seiko -does- build a good watch. I would be proud to own one, except
they cost too much money for me. I mean, if I had $300, I could think
of a lot of things that are needed around here before a wristwatch.

Now if I suddenly come into an inheritance ( way remote chance of that
happening ), I would love to have a Seiko. Good stuff, as I've had
one, my friends have them, and they can't be beat for the price. You
are lucky.

Lg

 
On Sun, 19 Dec 2004 23:22:01 -0500,
[email protected] wrote:

>On Sun, 19 Dec 2004 15:42:51 -0600, Lawrence Glickman
><[email protected]> wrote:
>
>>On Sun, 19 Dec 2004 21:31:14 GMT, Lon <[email protected]> wrote:
>>
>>>AZGuy proclaimed:
>>>
>>>> On 18 Dec 2004 09:04:25 -0800, [email protected] wrote:
>>>>
>>>>
>>>>>>I am trying to do a survey on driver's willingness of purchasing a
>>>>>>Digital Tire Pressure Gauge, to ensure driving safety.
>>>>>
>>>>>http://www.getagauge.com/
>>>>>
>>>>>Can't do much better than these - $10, and more accurate than digital.
>>>>>Best for digital is supposedly .5 lbs.
>>>>>I'm all in favor of getting a good quality gauge and using it, but
>>>>>don't think digital is it.
>>>>>Got one as a gift, and stays in the trunk for emergencies only.
>>>>
>>>>
>>>>
>>>> Is that a joke? You'd be lucky if those mechanical gauges were
>>>> accurate to even a pound and a couple drops could ruin what accuracy a
>>>> mechanical gauge did have. You can definitely do better. with
>>>> digital. Not to mention that it's pretty easy to find a digital gauge
>>>> that's at or under $10.
>>>> --
>>>
>>> That misstatement of fact makes the laughably false presumption that
>>> the sensors in an inexpensive digital guage are any more accurate
>>> than the fairly simple mechanisms available for old fashioned
>>> mechanical guages. It also evidences a rather common false
>>> belief that just because something appears to display values at
>>> a higher resolution that it is any more accurate than a possibly
>>> far more accurate display at a lower resolution. Plus a somewhat
>>> challenged grasp of tire inflation where if a pound of absolute
>>> pressure makes any real difference [as opposed to repeatability and
>>> relative pressure] you are driving in a manner where only a fool
>>> would use less than a very very expensive guage.
>>
>>Baloney. Even a $20 electronic watch will actually keep better time
>>than a $3000 Rolex. Don't believe me? I can provide the proof.
>>
>
>If the proof comes in the form that you buy me a digital watch and a
>rolex for comparison, count me in!
>
>:p

No, if I had the money, which I probably never will, I would buy a
Seiko in a heartbeat.

In the meantime, my $20 Timex will have to do. It tells the time,
date, day, alarm, has a stopwatch function, all that I really need. I
did have to change the watchband on it though to a Spidel because the
polymer band was giving me an allergic reaction. Otherwise, it is
doing a good job for $20. And every bit as accurate as anybody else's
mechanical watch who I am familiar with.

My point being, digital *can* be junk, if you get down to the $9
watches, but if you spend a little more, you've got something that
actually can take a licking and keep on ticking ( so to speak ).

Lg

 


Lawrence Glickman wrote:

> I use analog to get me a little *over* in pressure, and then the
> digital to bleed it down to the precise reading I want. Works for me.

Sigh - and why is this any better than just using the analog
gauge? Most of the consumer grade digital gauges I see only
measure in 0.5 lb increments. Don't you think you can read
an analog gauge this well (+/- 0.25 psi)? My personal
opinion is that digital gauges give the illusion of being
very precise without in fact being particularly precise or
accurate. How does the digital gauge decide what number to
display? I assume it has some algorithm which translates an
analog voltage measurement into a digital display, but does
the algorithm decide that 30.249 lb. as measured is 30.0 lb.
or 30.5 lb. displayed? How does it translate the air
pressure into a particular voltage? How accurate is the
pressure / voltage translation? And then how is the voltage
sampled and turned into a digital value? All things
considered, I prefer a good mechanical gauge. Now if someone
could sell me one that works reliably with water filler
tractor tires, I'd be really happy.

References:

http://bell.mma.edu/~jbouch/Glossary/Precision.html
http://www.theweatherprediction.com/habyhints/246/
 
On Mon, 20 Dec 2004 09:27:34 -0500, "C. E. White"
<[email protected]> wrote:

>
>
>Lawrence Glickman wrote:
>
>> I use analog to get me a little *over* in pressure, and then the
>> digital to bleed it down to the precise reading I want. Works for me.
>
>Sigh - and why is this any better than just using the analog
>gauge? Most of the consumer grade digital gauges I see only
>measure in 0.5 lb increments. Don't you think you can read
>an analog gauge this well (+/- 0.25 psi)? My personal
>opinion is that digital gauges give the illusion of being
>very precise without in fact being particularly precise or
>accurate. How does the digital gauge decide what number to
>display? I assume it has some algorithm which translates an
>analog voltage measurement into a digital display, but does
>the algorithm decide that 30.249 lb. as measured is 30.0 lb.
>or 30.5 lb. displayed? How does it translate the air
>pressure into a particular voltage? How accurate is the
>pressure / voltage translation? And then how is the voltage
>sampled and turned into a digital value? All things
>considered, I prefer a good mechanical gauge. Now if someone
>could sell me one that works reliably with water filler
>tractor tires, I'd be really happy.
>
>References:
>
>http://bell.mma.edu/~jbouch/Glossary/Precision.html
>http://www.theweatherprediction.com/habyhints/246/

And why does 1/4, or 1/2, or even 1 PSI make a difference?
A difference in altitude of 1000 feet will make more than that.
Knowledge may be power, but it can also be more time-consuming than
it's worth.
--
Bill Funk
Change "g" to "a"
 
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