"tony sayer" wrote in message
...
In article , Arfa Daily
writes
Ok, so who knows a bit about measuring audio power ? Setting aside any
furious arguments about peak power, rms power, average power, backpeddling
average peak music power on any given friday in March etc, does an audio
power meter sum the power in both half cycles to arrive at a reading, or
just one.

I guess what I'm asking is half wave reccy ahead of the meter, or full
wave
bridge ?

Arfa



Is this the arfa daily who's a service tech?..


FWIW if its just the output of an audio amp I just use two bloody great
8 ohm resistors on a large heatsink with stout cables to reduce ohmic
losses, and connect that to the amp and use me trusty Fluke bench DMM to
measure the AC power developed when running a sine wave with the Hewlett
Packard distortion analyser keeping note of the distortion level to see
when its going into clip.

Measure that at a few different frequencies and square the AC measured
volts and divide by the 8 'ommes and thats the RMS power.

Sufficient and accurate and IMHO a good indication of what the amp will
develop.....
--
Tony Sayer

Hi Tony

That's me. Useful input. Thanks.

Arfa

In article , Arfa Daily
writes

"tony sayer" wrote in message
...
In article , Arfa Daily
writes
Ok, so who knows a bit about measuring audio power ? Setting aside any
furious arguments about peak power, rms power, average power, backpeddling
average peak music power on any given friday in March etc, does an audio
power meter sum the power in both half cycles to arrive at a reading, or
just one.

I guess what I'm asking is half wave reccy ahead of the meter, or full
wave
bridge ?

Arfa



Is this the arfa daily who's a service tech?..


FWIW if its just the output of an audio amp I just use two bloody great
8 ohm resistors on a large heatsink with stout cables to reduce ohmic
losses, and connect that to the amp and use me trusty Fluke bench DMM to
measure the AC power developed when running a sine wave with the Hewlett
Packard distortion analyser keeping note of the distortion level to see
when its going into clip.

Measure that at a few different frequencies and square the AC measured
volts and divide by the 8 'ommes and thats the RMS power.

Sufficient and accurate and IMHO a good indication of what the amp will
develop.....
--
Tony Sayer

Hi Tony

That's me. Useful input. Thanks.

Arfa


Thought it was. The above power test was much the same whilst at Neve,
Audix, Audiolab, and SCPD.. AKA the BBC...;-))
--
Tony Sayer

tony sayer wrote:


FWIW if its just the output of an audio amp I just use two bloody great
8 ohm resistors on a large heatsink with stout cables to reduce ohmic
losses, and connect that to the amp and use me trusty Fluke bench DMM to
measure the AC power developed when running a sine wave with the Hewlett
Packard distortion analyser keeping note of the distortion level to see
when its going into clip.

Measure that at a few different frequencies and square the AC measured
volts and divide by the 8 'ommes and thats the RMS power.

Sufficient and accurate and IMHO a good indication of what the amp will
develop.....
--
Tony Sayer

That's exactly what I do, except I use a Levell millivoltmeter. With two
large 8ohm resistors, it's easy to get a 4ohm load when needed.

S.

Serge Auckland wrote:

I use a Levell millivoltmeter

I truly hate those with a vengeance although I still have one ! They were great
in 1973.

Graham

tony sayer wrote:

Thought it was. The above power test was much the same whilst at Neve,
Audix, Audiolab, and SCPD.. AKA the BBC...;-))

You were at Neve too ? When was that ? I was there 1985-88 ( project leader -
custom dept - or 'operations' as it was otherwise known ! )

Graham

In article ,
Eeyore wrote:
Thought it was. The above power test was much the same whilst at Neve,
Audix, Audiolab, and SCPD.. AKA the BBC...;-))

You were at Neve too ? When was that ? I was there 1985-88 ( project
leader - custom dept - or 'operations' as it was otherwise known ! )

And I used to break them then. ;-)

--
*Rehab is for quitters

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Eeyore rabbitsfriendsa
writes


tony sayer wrote:

Thought it was. The above power test was much the same whilst at Neve,
Audix, Audiolab, and SCPD.. AKA the BBC...;-))

You were at Neve too ? When was that ? I was there 1985-88 ( project leader -
custom dept - or 'operations' as it was otherwise known ! )

Graham


No this was way back in the 70's in the good/bad old days of prayer meetings
after work..

And being a non-attendee thats why I didn't get too far in the firm!.....
--
Tony Sayer

"tony sayer"

No this was way back in the 70's in the good/bad old days of prayer
meetings
after work..

And being a non-attendee thats why I didn't get too far in the firm!.....


** Are you serious ??

Who the heck were you supposed to be praying to ?

I once worked for a Scientologist - but he never had to GALL to even
mention the infamous L Ron.





......... Phil

In article , Phil Allison
writes

"tony sayer"

No this was way back in the 70's in the good/bad old days of prayer
meetings
after work..

And being a non-attendee thats why I didn't get too far in the firm!.....


** Are you serious ??

Who the heck were you supposed to be praying to ?

God I suppose...Ruperts god...

Nope, in those days Rupert Neve was a committed Christian and the rest
of the firm it appears had those leanings and that, in those days, was
the way it was there.

Of course these days they'd be done for discrimination of some sort or
another, or would have fallen foul of the PC brigade.

Course we're a bit more tolerant of more than the one religion these
days

I once worked for a Scientologist - but he never had to GALL to even
mention the infamous L Ron.





........ Phil





--
Tony Sayer