DIY Electric Car Forums banner

1 - 1 of 1 Posts

·
Registered
Joined
·
70 Posts
Discussion Starter #1
----- Original Message -----
From: "torich" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Friday, November 02, 2007 2:37 AM
Subject: Re: [EVDL] What the [email protected]#$!!


> You might also like this amp meter...
>
> http://cgi.ebay.com/3-1-2-Red-LED-Digital-AMP-Panel-Meter-Shunt-AC-1000-A_W0QQitemZ270159415056QQihZ017QQcategoryZ73158QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
>
> Rich in Va
> Hi Rich;

Thanx for the link. Anybody tried the "Asia Engineer" stuff? It looks
great, the panel meters stuff. You can pick out your amps and volts, and as
they are probably made by lowcoost slave labor, they pass the savings on to
you.The SHIPPING is more than the item! Maybe on a group, or several unit
order? It mayy be a tad cheaper? Before taking the plunge I thoought I'd
ask.

Seeya

Bob
> ----- Original Message -----
> From: "torich" <[email protected].xxx>
> To: <[email protected]>; "Electric Vehicle Discussion List"
> <[email protected]>
> Sent: Friday, November 02, 2007 1:31 AM
> Subject: Re: [EVDL] What the [email protected]#$!!
>
>
>> check this out it may help
>>
>> http://www.allaboutcircuits.com/vol_1/chpt_8/4.html
>>
>> Rich in Va
>>
>>
>> ----- Original Message -----
>> From: "Peter VanDerWal" <[email protected]>
>> To: "Electric Vehicle Discussion List" <[email protected]>
>> Sent: Friday, November 02, 2007 12:50 AM
>> Subject: Re: [EVDL] What the [email protected]#$!!
>>
>>
>>>
>>>>
>>>> Ummm I'm confused now. My Electrical mind is a little retro grade, but
>>>> isn't a meter Shunt supposed to go accross the two terminals of a volt
>>>> meter, adjusted to the voltage measured? And an amp meter has a preset
>>>> one
>>>> inthe same place (internal ususlly) measured to the sensitivty of the
>>>> meter?
>>>>
>>>> Both shunts are very low ohms?
>>>
>>> Umm, huh?
>>>
>>> Assuming we are talking about simple analog moving coil meters...
>>>
>>> A typical meter movement needs 50mv to move full scale.
>>> For an Amp meter, the shunt is select to produce 50mv when a given
>>> current
>>> flows through it (ohms law).
>>> Where the shunt is located in a series circuit is irrelevant because the
>>> current is the same everywhere so the current flowing through the
>>> shunt's
>>> resistance will have the same voltage drop anywhere in the circuit.
>>>
>>> For a Volt meter you typically use a resistor divider network so that
>>> 50mv
>>> flows through the meter when a given voltage is across the network.
>>> The location of the connections HAVE to be at where you want to measure
>>> the voltage.
>>> If you want to measure battery voltage, then the leads must be on each
>>> end
>>> of the battery pack.
>>> If you put a voltmeter's leads on either side of your shunt, then all
>>> you'll read is 50mv at max current.
>>>
>>> If you are using an E-meter (or similar multifunction meter), it has
>>> specific requirements on connection locations. The e-meter makes
>>> electrical connections between shunt and and battery negative and if the
>>> two points are at different voltage levels (i.e the shunt isn't where it
>>> needs to be) then you can short out something (normally the e-meter)
>>>
>>> _______________________________________________
>>> For subscription options, see
>>> http://lists.sjsu.edu/mailman/listinfo/ev
>>>
>>>
>>> --
>>> No virus found in this incoming message.
>>> Checked by AVG Free Edition.
>>> Version: 7.5.503 / Virus Database: 269.15.17/1103 - Release Date:
>>> 11/1/2007 6:01 AM
>>>
>>>
>>
>> _______________________________________________
>> For subscription options, see
>> http://lists.sjsu.edu/mailman/listinfo/ev
>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.5.503 / Virus Database: 269.15.17/1103 - Release Date:
>> 11/1/2007 6:01 AM
>>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
>
> --
> Internal Virus Database is out-of-date.
> Checked by AVG Free Edition.
> Version: 7.5.488 / Virus Database: 269.13.28/1023 - Release Date:
> 9/22/2007 1:27 PM
>
>

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 
1 - 1 of 1 Posts
Top