voltage question

S

Starman

Guest
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?
 
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
Click to expand...
 
"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
Click to expand...
"Milli" means one thousandth. There are 1000mV per V.

Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==
 
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
Click to expand...
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
 
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:
Click to expand...
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/da67d69b892bf09b?q=*-*-*-messes-up-the-order-*-*-*-*-*-*+RFC1855+removing-anything-*-*-*-*-*-*-not-relevant-to-the-point-you-are-making+top.posting+annoying+qq+*-importance-*&fwc=2
 
On Fri, 20 Jun 2008 05:24:42 GMT, "Starman"
<iknowbutidontknow@yahoo.com> wrote:

Hi,
I'm a newbie and wanting some advaice.
Click to expand...
---
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
 
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
Click to expand...
---
Unless you're talking about an integrator of some sort, milliseconds
doesn't equal volts.

And bottom post, please.

JF
JF
 
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.
Click to expand...
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
 
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
Click to expand...
try this powerpoint presentation:
http://www.north.ecasd.k12.wi.us/Departments/TechEd/dsmith/Electronics/Lesson%201_3--Scientific%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
 
(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]
 
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.
Click to expand...
Yeah, but you could go blind. :)
 
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