Author Topic: Amp meter  (Read 494 times)

Offline andy

  • A's Best Friend
  • ***
  • Join Date: Apr 2011
  • Posts: 66
  • Karma: 1
  • and so the fun begins !!
Amp meter
« on: 01.12. 2015 21:45 »
Ohhh electrical gurus I've been scratching my head over this  and decided to put the question your way......right I've got around to the electrics on my project and decided to go down the 12v positive earth route what's the best reading on the amp meter
        8-0-8.        Or.      12-0-12
Many thanks.
only 2 things needed in life wd40 and duck tape....if it moves and shouldn`t use tape if it don`t move and should use wd40.

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
Re: Amp meter
« Reply #1 on: 01.12. 2015 23:12 »

 Hiya Andy, I was dabbling with similar the other day, I've been using a 30-0-30 one that registers but only barely; I use imagination more....
 
 I conclude it doesn't matter much, but I figure the 8-0-8 will give a more accurate/readable reading, but depends on your loading I guess.

have a look at these links if you want;-

 http://www.a7a10.net/forum/index.php?topic=4183.msg28360#msg28360
and
http://www.a7a10.net/forum/index.php?topic=5035.msg34300#msg34300
and
http://www.a7a10.net/forum/index.php?topic=5035.msg74148#msg74148


 
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline andy

  • A's Best Friend
  • ***
  • Join Date: Apr 2011
  • Posts: 66
  • Karma: 1
  • and so the fun begins !!
Re: Amp meter
« Reply #2 on: 02.12. 2015 07:09 »
That's what I was guessing the higher the number the less it registered i.e. the needle didn't move much but I was wondering if the dynamo put out more than 8amps as I said I Don't know a lot about electricatry it's all voodoo and black magic lol I'm sort winging it as i go along cheers.
only 2 things needed in life wd40 and duck tape....if it moves and shouldn`t use tape if it don`t move and should use wd40.

Offline Klaus

  • Valued Contributor
  • ****
  • Join Date: Jun 2015
  • Posts: 376
  • Karma: 10
Re: Amp meter
« Reply #3 on: 02.12. 2015 07:33 »
Hi Andy,

I have converted to 12 Volts and l recomment you a 12 Amp one.
Related with the output from the dyno 6 Volts 45 Watt a  8-0-8 is nearly scratch the end of the scale.  6V x 8 Amp= 48 Watt
This Type of dyno was a pre war construction.
ln The fiftys the rised up to 6 Volts 60 Watt, so you need the 12-0- 12 to read correct.  6V x 10 Amp= 60 Watt

I have an Alton Generator with 12 Volt 145 Watt,so I need the 12-0 12 one.

If you have an output less than 100 Watt at 12 Volt you can fit 8-0-8 one   12V x 8 Amp = 96 Watt

Hope this will help to find a decision.

Cheers Klaus




If you think, everything is under control, you are not fast enought.

Offline andy

  • A's Best Friend
  • ***
  • Join Date: Apr 2011
  • Posts: 66
  • Karma: 1
  • and so the fun begins !!
Re: Amp meter
« Reply #4 on: 02.12. 2015 07:52 »
Yes it does thank you that was just what I was looking for.  *smile*
only 2 things needed in life wd40 and duck tape....if it moves and shouldn`t use tape if it don`t move and should use wd40.

Offline warmshed

  • A's Best Friend
  • ***
  • Join Date: Jul 2012
  • Posts: 161
  • Karma: 5
Re: Amp meter
« Reply #5 on: 02.12. 2015 08:30 »
Just to confuse matters, why go for +ve earth?.  Most led and other electrical items are made for -ve earth  (+ve earth are available but higher cost and difficult to source away from home) as all new vehicles use this configuration, no advantage to go +ve earth. If using the dynamo before you connect a -ve earth regulator  just touch a wire from the positive side of the battery then flash it onto the F tag of the dynamo, just 2 seconds work.

Offline a101960

  • Wise & Enlightened
  • *
  • Join Date: Sep 2007
  • Posts: 1040
  • Karma: 12
  • BSA RGS BSA C12
Re: Amp meter
« Reply #6 on: 02.12. 2015 08:59 »
Quote
Just to confuse matters, why go for +ve earth?.  Most led and other electrical items are made for -ve earth  (+ve earth are available but higher cost and difficult to source away from home) as all new vehicles use this configuration, no advantage to go +ve earth.
I agree