magnetic field when stacking

And there was me thinking that you bought a stereo to enjoy listening to music. But it has to be measured. And it has to be measured with expensive equipment. And people need to obsess about it. My measuring equipment's bigger than yours. Does it matter? Can't we just play the music? Perhaps it's time for an obsessives' corner. 

I’m not too concerned about insignificant things like magnetic radiation from transformers.

I’ve got significant real world worries. My wife just plugged the Christmas tree lights into my dedicated spur.

Hungryhalibut posted:

And there was me thinking that you bought a stereo to enjoy listening to music. But it has to be measured. And it has to be measured with expensive equipment. And people need to obsess about it. My measuring equipment's bigger than yours. Does it matter? Can't we just play the music? Perhaps it's time for an obsessives' corner. 

Hi Nigel,

You're in it !!!

fatcat posted:

I’m not too concerned about insignificant things like magnetic radiation from transformers.

I’ve got significant real world worries. My wife just plugged the Christmas tree lights into my dedicated spur.

OMG. WFT. ROFLMAO. 

@Fatcat

A common problem.  You can even find it in English-French phrase books:  "Ma femme vient de brancher les lumières de l'arbre de Noël dans mon spur dédié."

this is the Trifield 100XE meter -- which doesnt look much but can be calibrated to ISO17025 which is interesting

"And there was me thinking that you bought a stereo to enjoy listening to music. "

I do. So much so that I have helped developed items for production before now, been (and am being) in deep R&D beta programs etc, because I want to enjoy it even more.  

"But it has to be measured."

Ignorance is not bliss. 

"And it has to be measured with expensive equipment."

Properly calibrated, traceable, defendable in court, precision test equipment is not made in large quantities. It is niche, high-end and expensive. And it has a lot more R&D, tech, complexity and IP than a 555PS.

"And people need to obsess about it."

Pot kettle black

"My measuring equipment's bigger than yours."

I doubt it. 

"Does it matter?"

Not to me, dear heart. 

"Can't we just play the music?"

I do. Regularly. 

"Perhaps it's time for an obsessives' corner. "

I think you have found your own.

Love and kisses, Jon.

jon honeyball posted:

this is the Trifield 100XE meter -- which doesnt look much but can be calibrated to ISO17025 which is interesting

I was aware of that instrument.  If it truly does meet it's specifications (and I have absolutely no reason to believe that it doesn't) then it's a remarkable piece of kit for that price.

The error range on it is a little fruity in the spec. But its peanuts, and fun.

i bought from uk disti, so will need to return it to USA for calibration for my ukas lab. If I can be bothered, its not exactly mainstream. But its interesting to wave around various PSU  devices in an indicative ballpark relative fashion.

And its useful to blow some ingrained "truths" out of the water

1. jon honeyball posted:

   this is the Trifield 100XE meter -- which doesnt look much but can be calibrated to ISO17025 which is interesting

   thanks I have looked at that device, but resisted on reports of poor accuracy.. so interesting about your comment on calibration. Certainly that device will be good at showing indication of EMR from computer, iPad, phones, microwaves, ... basically most things electronic... quite shocking what you see from an Apple MacBook Pro ... apparently...

the calibration claim thing comes from their website. i too was wondering about its absolute accuracy, given it looks like something you would use to find pixies smoking pot....

however, joking aside, I'm interested in orders of magnitude here rather than primary reference measurement

interestingly enough, they state "however, if a calibration certification compliant with ISO 17025 is required, the meter must be recertified at least once a year in order to remain in compliance with that standard." 

which is not correct. ISO17025 certs do not have an end date. Its up to the ISO17025 user to determine whether recalibration is required. 

(sorry this is drifting... like the meter reading near a Nait1... :-) )

jon honeyball posted:

interestingly enough, they state "however, if a calibration certification compliant with ISO 17025 is required, the meter must be recertified at least once a year in order to remain in compliance with that standard." 

which is not correct. ISO17025 certs do not have an end date. Its up to the ISO17025 user to determine whether recalibration is required. 

My understanding of conformance with ISO standards (my experience is not with electronics) is that the user is free to take whatever measures he sees fit in order to comply - but if challenged, by a client or a court of law, for example - the onus is on you to demonstrate how you have complied. In practice, the easiest way to do this is to follow the instructions of the manufacturer, which would normally be accepted as valid. If you do anything else, you're on your own.

That is indeed true, but the certificates on all of our 17025 calibrated items (electronic and not (including rules and weights!)) is that they dont have end dates.

And simply following the prescription of the manufacturer is certainly a starting point, but no more than that. And i would agree that recalibration would usually be done faster than manufacturer specified if there was a worry about a device.

Anyways, we digress!

It'd be interesting to see what you come up with, once you destroy the mains waveform–but that's the fun of having test equipment

Boys must have their toys... ;-)

There is definitely something (bad) that happens when you stack components. My experience was the stacking of a (non-Naim) pre and power amp. A definite buzz/hum was induced through the speakers. Separating them a bit by adding some ~1cm spacers helped a lot, but they would have been much better even further apart. (I had very short interconnects at the time that limited my options)

I am looking forward to seeing the "Jon Honeyball Guide To Component Placement, Spacing and Cable Routing" with a chapter on listening and the effects on music replay of component and cable magnetic interaction.

Charlie

Only if it is statistically provable in appropriate listening tests in an IEC listening room. Self deception through getting up, moving things around, oxygenating your brain, having a slurp of the pinot noir, sitting down and deciding it sounds "better" simply doesnt count....

ianrobertm posted:

The Cat is Dead.

Top answer Mr S. Nice one.

John.

More important:

What's the effect on the human body, when sitting two meters from an active system?

Nothing I noticed when lying down in a 1.5 Tesla field for about 10 minutes, and that 1,000,000 times stronger than the field right above the box.
Even the earth's magnetic field is about 30 times stronger (give or take dependent on location).

Any tendency to react negatively to the earth's static field has been, surely, bred out of our genome.  

Alternating fields from electricity at power frequencies, on the other hand, are recent. Their strongest reproducible biological effect, given a sufficiently high field, is magnetophosphenes:

... which are quite different from natural phosphenes:

... or chemically enhanced ones:

... and for those of you still wondering: