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Sci.Electronics.Basics -> voltage question

There are 11 messages in this thread.
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Author: Starman
Date: 01:24 20-06-08


Hi,
I'm a newbie and wanting some advaice. I just purchased a multi-meter and
was wondering when I check the charge or voltage of a 1.5 battery, do I
place the switch selector to DCV on 2000m or do I place it on 200m? I am
confused as to what is the correct choice and proper voltage selection. I
know that for a 9 volt battery I place the selector on DCV 20 and I correct?




Author: Tim Wescott
Date: 02:17 20-06-08

Starman wrote:
> Hi,
> I'm a newbie and wanting some advaice. I just purchased a multi-meter and
> was wondering when I check the charge or voltage of a 1.5 battery, do I
> place the switch selector to DCV on 2000m or do I place it on 200m? I am
> confused as to what is the correct choice and proper voltage selection. I
> know that for a 9 volt battery I place the selector on DCV 20 and I correct?
>
>
>
The voltage you're selecting needs to be bigger than the one you're
trying to measure to prevent over range, and as small as you can get
away with to encourage accuracy.

So 2000mV (2V) would be appropriate for a 1.5V battery, but 200mV would
not give you a reading.

You could figure this out just by playing with the thing, you know.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

Author: Starman
Date: 02:41 20-06-08

well what i meant was how many ms equals 1 volt? then i can work it out

"Tim Wescott" <tim@seemywebsite.com> wrote in message
news:D8idnYFfsovB1sbVnZ2dnUVZ_uudnZ2d@web-ster.com...
> Starman wrote:
>> Hi,
>> I'm a newbie and wanting some advaice. I just purchased a multi-meter and
>> was wondering when I check the charge or voltage of a 1.5 battery, do I
>> place the switch selector to DCV on 2000m or do I place it on 200m? I am
>> confused as to what is the correct choice and proper voltage selection. I
>> know that for a 9 volt battery I place the selector on DCV 20 and I
>> correct?
>>
>>
>>
> The voltage you're selecting needs to be bigger than the one you're trying
> to measure to prevent over range, and as small as you can get away with to
> encourage accuracy.
>
> So 2000mV (2V) would be appropriate for a 1.5V battery, but 200mV would
> not give you a reading.
>
> You could figure this out just by playing with the thing, you know.
>
> --
>
> Tim Wescott
> Wescott Design Services
> http://www.wescottdesign.com
>
> Do you need to implement control loops in software?
> "Applied Control Theory for Embedded Systems" gives you just what it
says.
> See details at http://www.wescottdesign.com/actfes/actfes.html



Author: JeffM
Date: 04:05 20-06-08

>Tim Wescott wrote:
>>[...]2000mV (2V) would be appropriate for a 1.5V battery,
>>but 200mV would not give you a reading.
>>
>>You could figure this out just by playing with the thing, you know.
>>
Starman wrote:
>well what i meant was how many ms equals 1 volt?
>then i can work it out
>
There was someone else with a similar problem earlier:
news:h8ul5419eifvj8it7351pqbe2u71aub0v3@4ax.com

Scroll way down on this page for the basics:
http://www.google.com/search?q=cache:7Jg_I02dYTgJ:campus.murraystate.edu/tsm/tsm118/Ch2/
Ch2_2/Ch2_2.htm+Powers.of.Ten+u+mu+micro+already.used+milli+kilo+lower-case.k&strip=1
.
.
...and in this hierarchy we prefer old-school posting
(trim and bottom-post):
http://groups.google.com/group/comp.lang.lisp/browse_frm/thread/4a5d70882bf8f3d9/da67d69
b892bf09b?q=*-*-*-messes-up-the-order-*-*-*-*-*-*+RFC1855+removing-anything-*-*-*-*-*-*-no
t-relevant-to-the-point-you-are-making+top.posting+annoying+qq+*-importance-*&fwc=2

Author: BobW
Date: 04:16 20-06-08


"Starman" <iknowbutidontknow@yahoo.com> wrote in message
news:qiI6k.12792$IK1.553@news-server.bigpond.net.au...
> well what i meant was how many ms equals 1 volt? then i can work it out
>

"Milli" means one thousandth. There are 1000mV per V.

Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==



Author: John Fields
Date: 09:48 20-06-08

On Fri, 20 Jun 2008 05:24:42 GMT, "Starman"
<iknowbutidontknow@yahoo.com> wrote:

>Hi,
>I'm a newbie and wanting some advaice.

---
Crosspost, don't multipost.

That way, anyone can respond to your post from any NG they see it on
and the replies will automatically be posted to all of the groups you
crossposted to originally.

That saves folks like me, who responded to your post on
alt.electronics, from having to post it again here or wherever else
you multiposted it to.

JF

Author: John Fields
Date: 09:57 20-06-08

On Fri, 20 Jun 2008 06:41:26 GMT, "Starman"
<iknowbutidontknow@yahoo.com> wrote:

>well what i meant was how many ms equals 1 volt? then i can work it out

---
Unless you're talking about an integrator of some sort, milliseconds
doesn't equal volts.

And bottom post, please.

JF
JF

Author: Eeyore
Date: 10:57 20-06-08



John Fields wrote:

> On Fri, 20 Jun 2008 05:24:42 GMT, "Starman"
> <iknowbutidontknow@yahoo.com> wrote:
>
> >Hi,
> >I'm a newbie and wanting some advaice.
>
> ---
> Crosspost, don't multipost.

Not barking at you John, but for a newbie he may not be familiar with the
concept and indeed where appropiate and inapproriate.

http://en.wikipedia.org/wiki/Crossposting

Also in the other context see
http://en.wikipedia.org/wiki/Posting_style

Bottom and inline replying are preferred on Usenet.

Graham


Author: Jonathan Kirwan
Date: 14:09 20-06-08

On Fri, 20 Jun 2008 06:41:26 GMT, "Starman"
<iknowbutidontknow@yahoo.com> wrote:

>well what i meant was how many ms equals 1 volt? then i can work it out

try this powerpoint presentation:
http://www.north.ecasd.k12.wi.us/Departments/TechEd/dsmith/Electronics/Lesson%201_3--Sci
entific%20Notation%209-02.ppt

or
http://en.wikipedia.org/wiki/Engineering_notation

It helps a lot if you are familiar with scientific notation, as well.
Engineering notation builds upon that understanding:
http://en.wikipedia.org/wiki/Scientific_notation

Jon

Author: Roy
Date: 15:49 20-06-08

(Starman) wrote: Hi,
I'm a newbie and wanting some advice. I just purchased a multi-meter and
was wondering when I check the charge or voltage of a 1.5 battery, do I
place the switch selector to DCV on 2000m or do I place it on 200m? I am
confused as to what is the correct choice and proper voltage selection.
I know that for a 9 volt battery I place the selector on DCV 20 and I
correct?
------------------------
I posted a thorough answer from an access point at KB Electronics but a
robot ate it up :(Can you tell us what brand & model your meter is?
I can't believe you're asking this, but I'm pissed my reply was
vanquished - Other than the pseudo name I use ther at KB., it was well
detailed and very helpful.

Roy Q.T. ~ US/NCU ~ E.E. Technician
[have tools, will travel]


Author: Charlie Siegrist
Date: 12:04 21-06-08

On Thu, 19 Jun 2008 23:17:04 -0700, Tim Wescott wrote:

> You could figure this out just by playing with the thing, you know.

Yeah, but you could go blind. :-)

1


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