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Testing Your Head Unit Rca Voltage


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  • 3 weeks later...

the pre-outs should be 2v 4v or 5v. maybe even 8 but it specifies in your manual for the Hu does it not?

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i think you put it on AC?? because doesnt AC have signals idk

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How do you measure the RCA voltage at the end of my RCAs where they plug into the amp. Ive tried testing them many times but cant get any reading off of them? I put the DMM of AC right?

plug your RCAs into the H/U, put in a test tone disc. Set the CD player to repeat and set the CD to the frequency track you want. Then set your volume were you think it should be.

Radio is done

Set the DMM to AC Voltage (ACV). Plug your test leads in normal.

Now use the positive from the DMM on the center pin at the other end of the RCA. You must not touch the ground. PERIOD.

Next take the negitive from the DMM and put it to the ground on the RCA. (The round metal circle that surrounds the center pin)

A tip for ya is to make a positive DMM lead with a little alligator clip soldered on it. you can stick that to the center pin on the RCA and the regular negative tip in one hand and the RCA in the other.

Make one for the Negative too as it comes in handy when working on cars and always need a ground.

Isobaric - Refers to the practice of coupling two drivers together to make them act as one.

"Giving up doesn't always mean you are weak; sometimes it means that you are strong enough to let go."

Insanity: doing the same thing over and over again and expecting different results.

The Destruction of a person builds character.

 

Terryswork001.png

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Guys I meant to say AC Voltage, not AC Amperage.

I fixed it up above so it is rite now.

Sorry to everyone.

Isobaric - Refers to the practice of coupling two drivers together to make them act as one.

"Giving up doesn't always mean you are weak; sometimes it means that you are strong enough to let go."

Insanity: doing the same thing over and over again and expecting different results.

The Destruction of a person builds character.

 

Terryswork001.png

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Like I sayed above its real handy to have an alligator clip line for your DMM.

So for the ones that don't know heres some pics.

These are VERY EASY to make even if you can't solder.

Posted Image

Posted Image

Isobaric - Refers to the practice of coupling two drivers together to make them act as one.

"Giving up doesn't always mean you are weak; sometimes it means that you are strong enough to let go."

Insanity: doing the same thing over and over again and expecting different results.

The Destruction of a person builds character.

 

Terryswork001.png

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  • 2 months later...

Like I sayed above its real handy to have an alligator clip line for your DMM.

So for the ones that don't know heres some pics.

These are VERY EASY to make even if you can't solder.

Posted Image

Posted Image

Old post but I can't tell how hella useful that is. I have one of my old probes setup like that for ground when I'm doing remote starts.

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  • 5 months later...
  • 5 months later...

If you want to know the actual voltage going to the amp then you have to make a test pack of resistors that match the input impedance of the amp. Most meter leads are around .2-.4 ohms and the amp is around 5000 ohms.

Big difference

i want to challenge this.. since the RCAs are a parallel circuit, the impedance of the amp shouldn't affect voltage.. same way you will always get 110V AC in your home no matter what devices you have plugged in..

the only difference would be in the current flowing through the RCA leads..

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