Measuring true RMS wattage...

[photocrazy8 10+ year member]

Ok so i sort of have an idea of how to measure true RMS wattage using a DMM and True RMS clamp meter. But i looked every where and no where was there a step by step explination...

I have this DMM...http://us.fluke.com/usen/products/Fluke+78.htm?catalog_name=FlukeUnitedStates

And i will be also buying a Fluke Clamp meter so i was wondering which one i should get...http://us.fluke.com/usen/products/category.htm?category=CLMP(FlukeProducts)

also a step by step would be cool and also an explination of the equations used...

maybe this will be come a sticky //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Click to read more...

 

[xluben 10+ year member]

wouldn't you also need a o-scope to make sure the signal wasn't being clipped?

then wouldn't it just be RMS volts * amps = RMS power

i haven't done it before i'm just speculating..... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[photocrazy8 10+ year member]

bump i know there is more to it than that

 

[Ford302Redneck 10+ year member]

Also you can divide Volts/amps and get your rise //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[xluben 10+ year member]

Also you can divide Volts/amps and get your rise //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

true.

so someome link me to the cheapest clamp. i wanna know my real power!

 

[Death By Bass 10+ year member]

do you want to know how much power the amp can give into a known load (say, a 2 ohm non reactive dummy load) or, how much power you're really giving your subs, as well as the impedance rise?

 

[photocrazy8 10+ year member]

do you want to know how much power the amp can give into a known load (say, a 2 ohm non reactive dummy load) or, how much power you're really giving your subs, as well as the impedance rise?

i would like to know how much power im really giving my subs as well as rise, such as what typerbass was doing with the 20.1's and the 2500d's

thanks, andrew

 

[Johnny Drama 5,000+ posts]

i would like to know how much power im really giving my subs as well as rise, such as what typerbass was doing with the 20.1's and the 2500d's
thanks, andrew

Take the clamp and clamp it around the pos speaker leads to mesure the amps.

Place the + and - DMM on the speaker leads.

Mesure the volts and amps they read.

Multiply for the power

divide the V by the A to get the impedance.

 

[photocrazy8 10+ year member]

Take the clamp and clamp it around the pos speaker leads to mesure the amps. Place the + and - DMM on the speaker leads.

Mesure the volts and amps they read.

Multiply for the power

divide the V by the A to get the impedance.

ok so where do you get v and a? is there a link to the equation?

also what type of clamp meter fo you need? and how many amps should it be able to read and what type of amps is that DC or AC?

also on a side note what type of clamp do you need to have to see how many amps the amps are drawing and also what type of amps is that DC or Ac. thanks guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Johnny Drama 5,000+ posts]

ok so where do you get v and a? is there a link to the equation?
also what type of clamp meter fo you need? and how many amps should it be able to read and what type of amps is that DC or AC?

also on a side note what type of clamp do you need to have to see how many amps the amps are drawing and also what type of amps is that DC or Ac. thanks guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The V=volts which you will get from the DMM. The A is for amps which you will get from the Clamp meter.

The best kind of clamp and DMM to use are true RMS meters that have a peak hold feature.

 

[photocrazy8 10+ year member]

The V=volts which you will get from the DMM. The A is for amps which you will get from the Clamp meter.
The best kind of clamp and DMM to use are true RMS meters that have a peak hold feature.

thanks, so ones like this?

http://us.fluke.com/usen/products/specifications.htm?cs_id=30405(FlukeProducts)&category=CLMP(FlukeProducts)

and

http://us.fluke.com/usen/products/specifications.htm?cs_id=2279(FlukeProducts)&category=AUTO(FlukeProducts)

 

[Johnny Drama 5,000+ posts]

thanks, so ones like this?

http://us.fluke.com/usen/products/specifications.htm?cs_id=30405(FlukeProducts)&category=CLMP(FlukeProducts)

and

http://us.fluke.com/usen/products/specifications.htm?cs_id=2279(FlukeProducts)&category=AUTO(FlukeProducts)

Those will work, just make sure they have a peak hold setting.

 

[photocrazy8 10+ year member]

Those will work, just make sure they have a peak hold setting.

sweet i know tha DMM does cause i have it already i just need to get a clamp meter that does. I also want to get one that can measure the draw of an amp from the battery.