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Author Topic: Power Rating in AMPS for DBR12  (Read 718 times)

Art Welter

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Re: Power Rating in AMPS for DBR12
« Reply #10 on: March 16, 2019, 12:02:25 pm »

.. have you ever heard ELI the Iceman pneumonic for current lead/lag?
As I recall from your mnemonic, the Iceman caught pneumonia.
Must be another one for current lead/lag ;^).
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Bob Taylor

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Re: Power Rating in AMPS for DBR12
« Reply #11 on: March 16, 2019, 04:03:28 pm »

Bob, have you ever heard ELI the Iceman pneumonic for current lead/lag?

Sent from my VS996 using Tapatalk

Haven't heard that one. But do remember about Black Beard and that slut Violet.

Bob
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Frank Koenig

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Re: Power Rating in AMPS for DBR12
« Reply #12 on: March 16, 2019, 07:34:06 pm »

Another way to remember all this lead-lag stuff (and a whole lot more) is just three definitions:

Resistance: v = i R
Capacitance: i = C dv/dt
Inductance: v = L di/dt

where v and i are the instantaneous voltage and current.

From that and Kirchhoff's laws you can generate pretty much all of lumped linear passive circuit analysis.

--Frank
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Scott Holtzman

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Re: Power Rating in AMPS for DBR12
« Reply #13 on: March 16, 2019, 07:47:33 pm »

Another way to remember all this lead-lag stuff (and a whole lot more) is just three definitions:

Resistance: v = i R
Capacitance: i = C dv/dt
Inductance: v = L di/dt

where v and i are the instantaneous voltage and current.

From that and Kirchhoff's laws you can generate pretty much all of lumped linear passive circuit analysis.

--Frank
Frank,. Yeah that just rolls off the tongue

Sent from my VS996 using Tapatalk

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Chris Hindle

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Re: Power Rating in AMPS for DBR12
« Reply #14 on: March 16, 2019, 09:58:31 pm »

Another way to remember all this lead-lag stuff (and a whole lot more) is just three definitions:

Resistance: v = i R
Capacitance: i = C dv/dt
Inductance: v = L di/dt

where v and i are the instantaneous voltage and current.

From that and Kirchhoff's laws you can generate pretty much all of lumped linear passive circuit analysis.

--Frank
WAY above my pay grade.......
What happens if he just reads the info off the back of the device ?
I've always used that data to build my power distribution requirements.
I've never used AVR/whatever on Amps before. Is this now "good practice" due to the added processing on-board?
With universal voltage power supplies, I would think it's not needed.
Board and stage box, sure, I recommend it.
Chris.
« Last Edit: March 16, 2019, 10:03:55 pm by Chris Hindle »
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Frank Koenig

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Re: Power Rating in AMPS for DBR12
« Reply #15 on: March 16, 2019, 10:03:52 pm »

Frank,. Yeah that just rolls off the tongue

Well, I think eye-equals-cee-dee-vee-dee-tee does kinda roll off the tongue. And if you remember that then you can remember that the other one is the other one (the dual). Duality is so beautiful, too. OK. I'm into my Martini. -F
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Frank Koenig

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Re: Power Rating in AMPS for DBR12
« Reply #16 on: March 16, 2019, 10:17:41 pm »

What happens if he just reads the info off the back of the device ?

While I'm all for looking at the nameplate ratings, they tend to be wildly pessimistic if running actual music through the amplifier (or powered speaker). If the manufacturer doesn't publish 1/8 output power power consumption ratings it's better to get a Kill-A-Watt (the best test equipment deal ever) and measure it yourself.

https://en.wikipedia.org/wiki/Kill_A_Watt

--Frank
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Mike Sokol

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Re: Power Rating in AMPS for DBR12
« Reply #17 on: March 17, 2019, 08:56:31 am »

While I'm all for looking at the nameplate ratings, they tend to be wildly pessimistic if running actual music through the amplifier (or powered speaker). If the manufacturer doesn't publish 1/8 output power power consumption ratings it's better to get a Kill-A-Watt (the best test equipment deal ever) and measure it yourself.

https://en.wikipedia.org/wiki/Kill_A_Watt

--Frank

Yup, they're a great tool for less than $20!

I've also been looking for a version that can read 240-volts. I found what appears to be a "European" model that's rated for 240 volts, but the company doesn't seem to want to promote it for 240 volts in the USA since it has NEMA 5-15 connectors rated for 125-volt max. But this could possibly work to measure current & voltage for an amp rack wired for 240-volts.

Of course you would need to kludge a few oddball adapter cables to convert an Edison plug to whatever and back, but I think if they were short, clearly marked as test cables, and isolated from your regular distro cables, there wouldn't be any stupidity issues. What do you think?

https://www.amazon.com/P3-International-P4460-Electricity-Monitor/dp/B000RGF29Q
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Frank Koenig

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Re: Power Rating in AMPS for DBR12
« Reply #18 on: March 17, 2019, 11:19:55 am »

What do you think?
https://www.amazon.com/P3-International-P4460-Electricity-Monitor/dp/B000RGF29Q

Only gotcha that I can think of is that the European version would be intended for 50 Hz. I don't think that should throw off the calibration but it would be worth checking. -F
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Ed Hall

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Re: Power Rating in AMPS for DBR12
« Reply #19 on: March 17, 2019, 12:38:00 pm »

Yup, they're a great tool for less than $20!

I've also been looking for a version that can read 240-volts. I found what appears to be a "European" model that's rated for 240 volts, but the company doesn't seem to want to promote it for 240 volts in the USA since it has NEMA 5-15 connectors rated for 125-volt max. But this could possibly work to measure current & voltage for an amp rack wired for 240-volts.

Of course you would need to kludge a few oddball adapter cables to convert an Edison plug to whatever and back, but I think if they were short, clearly marked as test cables, and isolated from your regular distro cables, there wouldn't be any stupidity issues. What do you think?

https://www.amazon.com/P3-International-P4460-Electricity-Monitor/dp/B000RGF29Q

Wouldnít this do the same as the Kill-o-watt?

Iím a small provider with only a few amp racks. What Iíve done is test each rack at home running full-tilt-boogie so I know what they will draw in a worst case scenario. 

I also have a cord for 240V.

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