Electronic Amp Meter

[Tony Christian]

Can some point me in direction for a wiring diagram to build an Electronic
Amp Meter to read up to 50 amps charge/discharge? This for automotive use on
a 12V DC system.

Or does some know where one can buy one off the shelf?

Regards


Tony Christian

 

[Rheilly Phoull]

One day Tony Christian got dressed and committed to text

Can some point me in direction for a wiring diagram to build an
Electronic Amp Meter to read up to 50 amps charge/discharge? This for
automotive use on a 12V DC system.

Or does some know where one can buy one off the shelf?

Regards


Tony Christian

Never forget that Google is your friend, just a quick search on "current
shunts" should keep you occupied for a while
http://www1.jaycar.com.au/images_uploaded/shuntmul.pdf
would be a good place to start with.

 

[Wes.]

Can some point me in direction for a wiring diagram to build an Electronic
Amp Meter to read up to 50 amps charge/discharge? This for automotive use
on a 12V DC system.

Or does some know where one can buy one off the shelf?

Regards


Tony Christian

How about something adapted from this

http://www.siliconchip.com.au/cms/A_30669/article.html

Wes.

 

[CWatters]

One day Tony Christian got dressed and committed to text

Might help if you said where you live.

Fot the right shunt in parallel and these can read anything you want..
http://www.datel.com/dca520pc_news.htm
Image
http://www.datel.com/images/dca520pc_web.jpg

 

[Glenn Ashmore]

Fot the right shunt in parallel and these can read anything you want..
http://www.datel.com/dca520pc_news.htm
Image
http://www.datel.com/images/dca520pc_web.jpg

That type is probably the most practical digital ammeter for that kind of
use but one caution. The power to run the meter has to be isolated from the
circuit being measured. They need either a battery or an isolated dc/dc
converter to power them.

You can also find some 0-10 and 0-30 amp shunts with digital displays,
though not quite as pretty or high quality, for about $12 on ebay. Also
some ready made 0-200 amp digital automotive volt/amp meters for about
$80.00.

All they are is a 200mV volt meter wired across a current shunt that
delivers voltage calibrated to the meter's range. Shunts come in all sorts
of ranges but for these cheap meters you need eithe 1,10 or 100mV/amp shunt.
For exampe to read 200 amps on a 200 mV meter you need a shunt that delivers
1mV/amp. For a 20 amp range a 10mV/amp shunt.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

 

[JeffM]

for automotive use on a 12V DC system.

Or does some know where one can buy one off the shelf?
Tony Christian

http://www.google.com/search?q=site:jcwhitney.com+ammeter

Note: Running 50A into the passengers' compartment
just to measure it is probably a terrible idea.
**Remote sensing** with **Local Readout**
is likely what you want.

 

[Bernie E.]

You can take a look at http://www.allelectronics.com I think they would have
it for a very reasonable price.

 

[Larry Oravetz]

easiest thing to do is go to any auto parts store and ask for one

 

[Ross Herbert]

Might help if you said where you live.

Replying to Rheilly's post with this question is not the done thing.
Your question should have been directed to the OP.

 

[CWatters]

Replying to Rheilly's post with this question is not the done thing.
Your question should have been directed to the OP.

yeah sorry my mistake.

 

[Bert van den Berg]

Try:

www.cruzpro.com/a30.html

Remote sensing and programmable to use a 5.0 to 900 amp shunt

Regards,

Bert van den Berg
CruzPro Ltd.
www.cruzpro.com
35 Keeling Road, #A4
Henderson 1008
New Zealand
Tel: 64-9-838-3331
Fax: 64-9-838-3332

 

[quietguy]

Just about any auto parts store carry those

David

 

[NSM]

Can some point me in direction for a wiring diagram to build an Electronic
Amp Meter to read up to 50 amps charge/discharge? This for automotive use on
a 12V DC system.

Or does some know where one can buy one off the shelf?

http://www.rpelectronics.com/English/Content/Items/UK321.asp

Add your own (remote) shunt. It'll display volts as well.

 

[Lasse Licht]

Hi,

You could buy the BMV-501 several companies offer this device. I have a
Victron. www.victronenergy.com

Lasse

 

[Tony Christian]

Thanks to all who replied and sorry for taking so long to acknowledge the
replies. There's that horrible word called work.

I live in Australia.

There are no off the shelf units that I have found so that gave rise to my
post.

Last but not least thanks for the links which hopefully put on the correct
path.

Again thanks to all,

Regards


Tony Christian

Can some point me in direction for a wiring diagram to build an Electronic
Amp Meter to read up to 50 amps charge/discharge? This for automotive use
on a 12V DC system.
Or does some know where one can buy one off the shelf?
Regards

Tony Christian

-- RegardsTony ChristianAlbany Fitness

 

[Tony Christian]

Thanks to all who replied and sorry for taking so long to acknowledge the
replies. There's that horrible word called work.

I live in Australia.

There are no off the shelf units that I have found so that gave rise to my
post.

Last but not least thanks for the links which hopefully put on the correct
path.

Again thanks to all,

Regards


Tony Christian

Can some point me in direction for a wiring diagram to build an Electronic
Amp Meter to read up to 50 amps charge/discharge? This for automotive use
on a 12V DC system.
Or does some know where one can buy one off the shelf?
Regards

Tony Christian

-- RegardsTony ChristianAlbany Fitness

 

[NSM]

Thanks to all who replied and sorry for taking so long to acknowledge the
replies. There's that horrible word called work.

I live in Australia.

Dick Smith? Radio Shack/Tandy? Silicon Chip Magazine?

 

[Franc Zabkar]

How about something adapted from this

http://www.siliconchip.com.au/cms/A_30669/article.html

Wes.

Slightly OT, but I notice that Silicon Chip Magazine incorrectly
refers to the wire to be measured as a "half-turn" primary winding.
Consequently I wonder whether their design overestimates the current
by a factor of two??? Then again, perhaps their calibration procedure
accounts for the anomaly?

"Unlike this unit, many commercial current clamp meters can only
measure AC. That's because they are basically current transformers,
comprising turns of wire around a magnetic core. This magnetic core is
clipped around the wire to be measured, which effectively behaves as a
half-turn primary winding."


- Franc Zabkar

 

[Wayne.B]

That type is probably the most practical digital ammeter for that kind of
use but one caution. The power to run the meter has to be isolated from the
circuit being measured. They need either a battery or an isolated dc/dc
converter to power them.

===========================

Is that because the meter needs a floating ground, or is there another
reason?

 

[Dave Plowman (News)]

Thanks to all who replied and sorry for taking so long to acknowledge
the replies. There's that horrible word called work.

I live in Australia.

There are no off the shelf units that I have found so that gave rise to
my post.

Last but not least thanks for the links which hopefully put on the
correct path.

I e-mailed you offering to send you the full constructional details of
exactly what you need - from a no longer available kit, but easy enough to
buy the parts individually.

If you didn't get my mail and would like it, mail be back - observing the
spam trap measures given at the bottom of this post.