ground check

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ralphpylayanum1

Member - Posts: 12

Joined: April 08, 2006

Posted: July 19, 2006 at 1:21 AM / IP Logged

hey guys to make it easier im gonna get the red end of my tester put it on the ground lead which goes on the battery whcih will be disconected from the batery and put the blackl wire from the tester to the other end my amp now one question if the other end that goes to my amp is jumped from a capacitor does it matter????

rafael rodriguez

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Joined: November 01, 2003

Location: Alberta, Canada

Posted: July 19, 2006 at 1:53 AM / IP Logged

I assume that you are measuring the ground return resistance? If that is the case, then the answer is no.

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ralphpylayanum1

Member - Posts: 12

Joined: April 08, 2006

Posted: July 19, 2006 at 1:33 PM / IP Logged

so how is the easy way of u explaing it to me so the i will understand better on hot to do that because i know if there is not any ground u rreal arent gettin current

rafael rodriguez

geepherder

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Joined: October 27, 2003

Posted: July 19, 2006 at 8:42 PM / IP Logged

It sounds like you're trying to make this more complicated than it needs to be. Rob's answer was no- it doesn't matter if you have a capacitor hooked up when you measure ground resistance. You don't need to disconnect the battery for that matter, either. Just make sure the system is off before measuring.

My ex once told me I have a perfect face for radio.

Flakman

Copper - Posts: 365

Joined: April 25, 2005

Location: United States

Posted: July 19, 2006 at 11:40 PM / IP Logged

Yep...as long as the circuit is not complete to the battery, the CAP won't be drawing from the meter.

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coppellstereo

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Joined: November 21, 2005

Location: United States

Posted: July 20, 2006 at 2:15 AM / IP Logged

touch one lead to battery's negative post

other to your amps' ground

Mad Scientists

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Joined: February 07, 2004

Location: United States

Posted: July 20, 2006 at 5:23 PM / IP Logged

and have the meter set to measure DC volts, and have the music turned up.. its the best way to measure circuit path resistance.

Jim

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coppellstereo

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Posted: July 20, 2006 at 8:13 PM / IP Logged

wouldnt you measure resistance in ohms?

geepherder

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Joined: October 27, 2003

Posted: July 20, 2006 at 9:25 PM / IP Logged

Yes, resistance is measured in ohms, but voltage is the best way to test a ground. Even if a ground checks okay when you "ohm it out", it can still cause a significant voltage drop under load.

My ex once told me I have a perfect face for radio.

coppellstereo

Silver - Posts: 785

Joined: November 21, 2005

Location: United States

Posted: July 20, 2006 at 11:42 PM / IP Logged

that makes sense.

Do you watch the output voltage of the amp, or the output at the battery?

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