--===============4307478063088089235==
boundary="=====================_765696421==.ALT"
--=====================_765696421==.ALT
Content-Transfer-Encoding: quoted-printable
I dunno abott that "formal engineering
nomenclature" stuff. I'm an engineer, and in my
world "rev counter" may be the British (English)
term for a tachometer, but otherwise rev counter
and tachometer are the same thing in the
automotive world, regardless of the type of signal input.
Just for reference, here are examples of dozens
of tachometers, many mechanically driven and
having nothing to do with ignition systems or any kind of electrical input:=
https://duckduckgo.com/?q=3Dhand+tachometer&iax=3Dimages&ia=3Dimages&iai=3D=
https%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_default%2Facision-tm1100-ha=
nd-held-tachometer.jpg&t=3Dffab
At 02:44 AM 8/3/2023, Paul Hunt wrote:
>....
>Both those are describing the function of the
>instrument which is the same in both cases and
>is not the point in question. Even so the first
>definition includes the statement "In formal
>engineering nomenclature, more precise terms are used to distinguish the t=
wo.".
>
>The PO's question was how do I connect a
>_tachometer_ , and the answer to that is
>fundamentally different to a rev counter. rev
>counter displays the rate at which a cable drive
>is turning, a tachometer measures the time
>between successive electrical pulses. In the rev
>counter case it doesn't matter whether it is on
>a 4, 6 or 8 (etc.) cylinder whereas for a
>tachometer the pulses from an 8 cylinder engine
>are coming in at twice the rate of a 4-cylinder
>and there have to be _internal_ differences in
>the tachometer to display that correctly. If the
>terms are used interchangeably then when
>responding to a (formal engineering?) question
>you would first have to establish which one is being talked about!
>
>PaulH.
>On 02/08/2023 14:29, dave northrup wrote:
>>
>> From Wikipedia
>>
>>A tachometer (revolution-counter, tach,
>>rev-counter, RPM gauge) is an instrument
>>measuring the rotation speed of a
>><https://en.wikipedia.org/wiki/Axle>shaft or
>>disk, as in a motor or other
>>machine.<https://en.wikipedia.org/wiki/Tachometer#cite_note-1>[1]
>>The device usually displays the
>><https://en.wikipedia.org/wiki/Revolutions_per_minute>revolutions
>>per
>><https://en.wikipedia.org/wiki/Revolutions_per_minute>minute
>>(RPM) on a calibrated analogue dial, but
>>digital displays are increasingly common.
>>
>>The word comes from
>><https://en.wikipedia.org/wiki/Greek_language>Greek
>>=CF=84=CE=AC=CF=87=CE=BF=CF=82 (t=A1chos "speed") and =CE=BC=CE=AD=CF=84=
=CF=81=CE=BF=CE=BD
>>(m=C3=A9tron "measure"). Essentially the words
>>tachometer and
>><https://en.wikipedia.org/wiki/Speedometer>speedometer
>>have identical meaning: a device that measures
>>speed. It is by arbitrary convention that in
>>the automotive world one is used for engine
>>revolutions and the other for vehicle speed. In
>>formal engineering nomenclature, more precise
>>terms are used to distinguish the two.
>>
>> From dictionary.com
>>
>>tachometer
>>
>>[ ta-kom-i-ter, tuh- ]SHOW IPA
>>
>>----------
>>noun
>> * any of various instruments for measuring
>> or indicating velocity or speed, as of a machine, a river, or the blood.=
>> * an instrument measuring revolutions per minute, as of an engine.
--
This email has been checked for viruses by AVG antivirus software.
www.avg.com
--=====================_765696421==.ALT
Content-Transfer-Encoding: quoted-printable
<html>
<body>
<font size=3D3>I dunno abott that "formal engineering
nomenclature" stuff. I'm an engineer, and in my world
"rev counter" may be the British (English) term for a
tachometer, but otherwise rev counter and tachometer are the same thing
in the automotive world, regardless of the type of signal input.<br><br>
Just for reference, here are examples of dozens of tachometers, many
mechanically driven and having nothing to do with ignition systems or any
kind of electrical input:<br>
<a href=3D"https://duckduckgo.com/?q=3Dhand+tachometer&iax=3Dimages&=
;ia=3Dimages&iai=3Dhttps%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_defa=
ult%2Facision-tm1100-hand-held-tachometer.jpg&t=3Dffab" eudora=3D"autou=
rl">
https://duckduckgo.com/?q=3Dhand+tachometer&iax=3Dimages&ia=3Dimage=
s&iai=3Dhttps%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_default%2Facisi=
on-tm1100-hand-held-tachometer.jpg&t=3Dffab<br>
<br>
<br>
</a>At 02:44 AM 8/3/2023, Paul Hunt wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D"">....<br>
Both those are describing the function of the instrument which is the
same in both cases and is not the point in question. Even so the first
definition includes the statement "In formal engineering
nomenclature, more precise terms are used to distinguish the
two.".<br><br>
The PO's question was how do I connect a _tachometer_ , and the answer to
that is fundamentally different to a rev counter. rev counter displays
the rate at which a cable drive is turning, a tachometer measures the
time between successive electrical pulses. In the rev counter case it
doesn't matter whether it is on a 4, 6 or 8 (etc.) cylinder whereas for a
tachometer the pulses from an 8 cylinder engine are coming in at twice
the rate of a 4-cylinder and there have to be _internal_ differences in
the tachometer to display that correctly. If the terms are used
interchangeably then when responding to a (formal engineering?) question
you would first have to establish which one is being talked
about!<br><br>
PaulH.</blockquote><br><br>
<blockquote type=3Dcite class=3Dcite cite=3D"">On 02/08/2023 14:29, dave
northrup wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D""><br>
From Wikipedia<br><br>
A <b>tachometer</b> (<b>revolution-counter</b>, <b>tach</b>,
<b>rev-counter</b>, <b>RPM gauge</b>) is an instrument measuring the
rotation speed of a
<a href=3D"https://en.wikipedia.org/wiki/Axle";>shaft</a> or disk, as in a
motor or other
machine.<a href=3D"https://en.wikipedia.org/wiki/Tachometer#cite_note-1";>
<sup>[1]</a></sup> The device usually displays the
<a href=3D"https://en.wikipedia.org/wiki/Revolutions_per_minute";>
revolutions</a> per
<a href=3D"https://en.wikipedia.org/wiki/Revolutions_per_minute";>minute</a>=
(RPM) on a calibrated analogue dial, but digital displays are
increasingly common.<br><br>
The word comes from
<a href=3D"https://en.wikipedia.org/wiki/Greek_language";>Greek</a>
=CF=84=CE=AC=CF=87=CE=BF=CF=82 (<i>t=A1chos</i> "speed") and =CE=
=BC=CE=AD=CF=84=CF=81=CE=BF=CE=BD
(<i>m=C3=A9tron</i> "measure"). Essentially the words tachometer
and <a href=3D"https://en.wikipedia.org/wiki/Speedometer";>speedometer</a>
have identical meaning: a device that measures speed. It is by arbitrary
convention that in the automotive world one is used for engine
revolutions and the other for vehicle speed. In formal engineering
nomenclature, more precise terms are used to distinguish the
two.<br><br>
From dictionary.com<br><br>
<b>tachometer<br>
</b><br>
[ ta-<b>kom</b>-i-ter, t<i>uh</i>- ]SHOW IPA<br>
<hr>
<i>noun</i>
<ol>
<li>any of various instruments for measuring or indicating velocity or
speed, as of a machine, a river, or the blood.
<li>an instrument measuring revolutions per minute, as of an engine.
</font>
</ol></blockquote></blockquote><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9F=
DF2"><br /><table style=3D"border-top: 1px solid #D3D4DE;"><tr><td style=3D=
"width: 55px; padding-top: 13px;"><a href=3D"http://www.avg.com/email-signa=
ture?utm_medium=3Demail&utm_source=3Dlink&utm_campaign=3Dsig-email&utm_cont=
ent=3Demailclient" target=3D"_blank"><img src=3D"https://s-install.avcdn.ne=
t/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png" alt=3D"" width=3D"=
46" height=3D"29" style=3D"width: 46px; height: 29px;"/></a></td><td style=
=3D"width: 470px; padding-top: 12px; color: #41424e; font-size: 13px; font-=
family: Arial, Helvetica, sans-serif; line-height: 18px;">Virus-free.<a hre=
f=3D"http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlin=
k&utm_campaign=3Dsig-email&utm_content=3Demailclient" target=3D"_blank" sty=
le=3D"color: #4453ea;">www.avg.com</a></td></tr></table><a href=3D"#DAB4FAD=
8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width=3D"1" height=3D"1"> </a></div></body>
</html>
--=====================_765696421==.ALT--
--===============4307478063088089235==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Mgs@autox.team.net
Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/mgs/mharc@autox.team.net
--===============4307478063088089235==--
|