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| Car Audio Do you live in your car? Then you need to be able to listen to some high-quality music. |
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#1
01-29-2007, 02:35 PM
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dmm question
is it possable to use a dmm to see how much watts your amp is putting out?
or do you have to use an o-scope 
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#2
01-29-2007, 06:06 PM
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Re: dmm question
Im not 100% sure, i always though you could put the leads to the pos/neg of the amp and read them as amps, and do the formula to get the power your putting out.
__________________
Cant remember who posted it but if you see it give yourself credit Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota. Cardomain
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#3
01-29-2007, 07:18 PM
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Re: dmm question
putting the leads to the positive and negative will yield a voltage reading, to read current the meter must be in series .... i.e. you disconnect one the speakers leads and connect the speaker wire to one of the DMM leads, the other DMM lead is connected to where the speaker lead was connected to the amp.
The first method is acceptable and the easier of the two, the formula is: Power = Volt^2/R. Remember to set the DMM to Volt AC .... NOT DC.
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#4
01-29-2007, 08:21 PM
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Re: dmm question
/\/\/\yep he's right
__________________
Silverado Ext. Cab 4x4 z71 Pioneer 4900mp Orion P6.2 Componet sets front Orion C63 Coax rear DirectedVideo 9" all in one DVD with surround 2007 SATURN OUTLOOK AWD XR with full entertainment package
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#5
01-30-2007, 12:00 AM
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Re: dmm question
Thank you for making how its done clear, iver tried it but it didnt work so now i know why.
__________________
Cant remember who posted it but if you see it give yourself credit Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota. Cardomain
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#6
01-30-2007, 01:30 PM
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Re: dmm question
and if you try to hook up a regular dmm in series to find amperage draw, you will most likely fry your dmm. most can only handle around 10 amps.
__________________
2001 Ford ZX-2 Alpine CDA-9855 SAX 100.4 Rainbow CMX 265 front stage Stock 5X7 rear fill Hifonics BX1505D TC-5200
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#7
01-30-2007, 04:42 PM
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Re: dmm question
Quote:
thanks i will be sure to try it when i buy a dmm tomorrow. now what is something to look for when looking for a dmm to do that plus set gains and stuff like that.
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#9
01-30-2007, 07:58 PM
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Re: dmm question
This is the one i got
http://cgi.ebay.com/VELLEMAN-DVM850B...QQcmdZViewItem Im going to start saving up for one with an o-scope.
__________________
Cant remember who posted it but if you see it give yourself credit Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota. Cardomain
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#10
01-30-2007, 08:02 PM
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Re: dmm question
I installed a 60amp gauge in my dash dedicated to the amp. That way I can see what I'm pulling all the time. So far I've got it up to 45 amps continuous. On 10gauge wire, that's pushing it....
__________________
2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#11
01-30-2007, 08:05 PM
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Re: dmm question
Quote:
can you fry a egg on the amp yet? oh and paulD that is voltage square right.
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#12
01-30-2007, 08:13 PM
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Re: dmm question
heh heh, you could until I mounted a 80mm 72cfm fan out of a PC on it. It's loud as hell, though. I try to keep it around 30amps with a tight bass hit.
__________________
2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#14
01-31-2007, 11:23 PM
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Re: dmm question
Just to have one, never know when you will need it and i can get one for about 150. I dont have a reason why and i do all my tuning by ear.
__________________
Cant remember who posted it but if you see it give yourself credit Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota. Cardomain
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i need one too.
