just got my dmm and another batt concern
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=101923
Printed Date: May 09, 2024 at 3:55 PM
Topic: just got my dmm and another batt concern
Posted By: mazzasec
Subject: just got my dmm and another batt concern
Date Posted: February 05, 2008 at 10:40 PM
Well I just got my DMM and i got a couple questions on how to use it.
1. What setting is used for testing the ohms?
2. What setting is used for testing the battery volts?
3? How do I set my gains and adjust my audio using the DMM so I can make sure my speakers are getting just the right amount of power. To see how much RMS power that putting out at a certain volume.
And for the battery question. Is it bad to ground all my amps to the - terminal on the battery in the back? or should I ground them all in seperate locations on the chassis?
Replies:
Posted By: techman93
Date Posted: February 06, 2008 at 12:00 AM
To test ohms there should be an ohms symbol on there with a range of values or one setting if auto ranging.
To test battery volts set to V DC and if there is a 20v setting that is what I use unless it is auto ranging.
I have never used a DMM to test for wattage or RMS and neither has anyone I have ever worked with so I would say it's kinda a waste of time with a DMM. I think you would need an oscilloscope and some other equipment to test for that.
Ground the amps to one location and first choice should be a solid piece of metal within 3 feet of equipment. The shorter the better and the cable should be the same size as battery cable run to amp + terminal.
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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
Posted By: mazzasec
Date Posted: February 06, 2008 at 12:12 AM
So i dont ground them all to the battery? just all one location on the chassis? Or can this be an option on location on the chassis then have the one wire ran to a distroblock and the have my ground wires go from the distro to the amps?
Posted By: techman93
Date Posted: February 06, 2008 at 7:28 PM
One ground will limit chance of ground loop noise entering system. The shorter the cable the better within 3 feet of equipment for optimum current transfer. You can ground with distribution block but try to keep wires as short as you can.
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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
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