Nah. I did what I always do... point to something many/most will find makes an improvement. But these are all some-what talented people and they have enough input to do it (DIY) and maybe with some variations. Test it and listen to it.
Otherwise, buy the models Demian referred to. Demian developed the voltage regulator BTW.
Stay extreme and enjoy.
THx-RNMarsh
Mark.... new current loop probes on the way. various sizes.
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There's a lot of different standards in that link that DPH gave. Do you actually know what is in any of them?
EFT and burst generators can couple some really nasty stuff onto the mains.
http://www.emtest.com/products/product/135120100000010208.pdf
Some of the tests may be easy to pass but I doubt you have spent enough time figuring out what is and what isn't.
Benchmark knows what they are doing, but a lot of high end equipment looks dubious. Probably would be permanently damaged by many compliance tests.
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You can do that also if you like and if you can to each and every piece of gear.
My way is universal... it works on all components and systems.
THx-RNMarsh
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If I was working with something that had some serious power, I have not doubt meeting standards would become more difficult. But as is, audio gear really isn't facing problems with emission. The standard LPS is better than most household items for the noise generated, and we're talking items that have required standards to be picked up by large distributors. (and be legal in certain areas of US, don't know about in other countries)
I guess I don't mind being in the trivial class
As DPH pointed out, some are applicable to audio, others are not. But funny that you ask, as there are some of them that are showing up in the audio world. And I have already referred to that many times. The audio world is in the "trivial" class after all, but classD has forced some emission standards to become applicable.
While some high gear is dubious, I'd say their power supplies are generally innocuous. Either they are not made by the audio company, or they're relatively simple LPS variations. You don't see much else. But once you move to the rest of the appliance... well we all know those stories.
How much does an EFT cost? *drool* I'd love to have one as I suspect I'd learn new lessons much quicker.
When it comes to playback, sometimes something that would be quantified objectively as small, is *huge* for the listener. You could say something like a conditioner only changed the sound 3%, but what is important might be that 3% is the difference between listening to music or not. For me the fatigue level associated is that difference, but it is small enough that people often don't notice at first. Although then again with some gear like some Yamaha stuff I guy I knew had, it was like changing speakers...
A lot of margin on that $1300? That last line sounds like it came from Bybee.
Hi Scott,
Look at a picture of one (as I did). I can see that price in the consumer market easily. That and they would be heavy as sin to ship. All that adds to the cost of the things.
Had I the money, I would buy one. You can easily pay more for something much less effective. If I had the knowledge and the resources to build a couple, I might go that route as long as I didn't see them. making them pretty costs $$.
-Chris
Look at a picture of one (as I did). I can see that price in the consumer market easily. That and they would be heavy as sin to ship. All that adds to the cost of the things.
Had I the money, I would buy one. You can easily pay more for something much less effective. If I had the knowledge and the resources to build a couple, I might go that route as long as I didn't see them. making them pretty costs $$.
-Chris
+1
.....included in this set of course are items displayinging CE certification, go figure.Dan.
Sounds good, I'm interested. In fact I was just thinking about some current measurements I would like to make. For some I will probably use a small shunt and scope isolator.
In ancient history, we used to have a TEK DC-20MHz or so clip-on scope current probe where I worked. It was pretty neat and sometimes just the thing, although they were expensive, IIRC. It would be nice if things like that were more readily available at reasonable cost. Seems like one reason we tend to think as much in terms of voltage as we do is because it is often so much easier to measure than current. Just saying.
Since when does ugly have a sound? So is there really $20 in the pretty (heavy) box, just inform the DIYer's and let them run with it.
hahaha
cute.
Sounds like you dont know what you are talking about.
-7000 inside -->
THx-RNMarsh
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Hi,
I have TEK current probe... clamp on type as you describe. Welcome to use it.
But, I am going to Thailand on Monday. Come by soon.
Richard
Chris is wise to see the costs. They add up. Even the cheapest quality receptacles are $10ea on eBay, which are leftovers from big projects so the seller changes often. CMC's run $8~. Then you've got choices like bus bar or terminal strips made from mediocre materials. Then the tools to work it all, taps and stuff.
It all adds up. Everything is bigger and more expensive with AC mains.
Here's a bus from one that a friend had me custom make. It's copper that is plated. The connectors are copper that are fire rated - you can only do so many in a day before your hands are DONE.
It all adds up. Everything is bigger and more expensive with AC mains.
Here's a bus from one that a friend had me custom make. It's copper that is plated. The connectors are copper that are fire rated - you can only do so many in a day before your hands are DONE.
Thanks Scott,
I could really use one of these. Same for a set of EMC nearfield probes.
The closest thing I have are a pair of HP 428B DC clamp meters that are good to about 200 Hz using the rear jacks into a meter. The main meter is DC only. Still, very happy to have these! I also have a normal AC clamp meter, but they aren't good for very high frequencies at all.
Too bad a clamp-on type of current probe needs a cut and polished ferrite ring with support mechanism and compensation (I bet) which puts them out of reach for the normal hobbyist or small business.
-Chris
Edit: The calibration will set you back $100 and change, > $200 with full data. That's what you would need, and specify to the cal lab what frequency and current ranges you want. And that was back in 2000!
I could really use one of these. Same for a set of EMC nearfield probes.
The closest thing I have are a pair of HP 428B DC clamp meters that are good to about 200 Hz using the rear jacks into a meter. The main meter is DC only. Still, very happy to have these! I also have a normal AC clamp meter, but they aren't good for very high frequencies at all.
Too bad a clamp-on type of current probe needs a cut and polished ferrite ring with support mechanism and compensation (I bet) which puts them out of reach for the normal hobbyist or small business.
-Chris
Edit: The calibration will set you back $100 and change, > $200 with full data. That's what you would need, and specify to the cal lab what frequency and current ranges you want. And that was back in 2000!
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If I was working with something that had some serious power, I have not doubt meeting standards would become more difficult. But as is, audio gear really isn't facing problems with emission. The standard LPS is better than most household items for the noise generated, and we're talking items that have required standards to be picked up by large distributors. (and be legal in certain areas of US, don't know about in other countries)
I guess I don't mind being in the trivial class
As DPH pointed out, some are applicable to audio, others are not. But funny that you ask, as there are some of them that are showing up in the audio world. And I have already referred to that many times. The audio world is in the "trivial" class after all, but classD has forced some emission standards to become applicable.
While some high gear is dubious, I'd say their power supplies are generally innocuous. Either they are not made by the audio company, or they're relatively simple LPS variations. You don't see much else. But once you move to the rest of the appliance... well we all know those stories.
How much does an EFT cost? *drool* I'd love to have one as I suspect I'd learn new lessons much quicker.
Not exactly sure but figure $10-30k USD depending on model.
EFT is great for finding sensitive points in digital systems. Probably more relevant to audio would be testing for immunity to power line noise. Typical setup is an injection transformer to drive current into the power coupled to an amp that is really sturdy (for obvious reasons) driven from an oscillator etc. With a network analyzer you could drive the amp driving the power line and look at how much makes its way to the output. Here is a description of the process and what you might need: 7021-1 Phase Shift Network | Application | Solar Electronics
Lots of other basic EMC stuff there as well.
Lots of other basic EMC stuff there as well.
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