USB shield at device.

I suspect that back-story is that the customers don't want to pay for it.

Sylvia.

It is a joke. Statistical testing is a way to test a fraction of your items and measure the quality of your process. Very useful when you are shipping lots of low cost items where the testing would increase the cost of the goods. Not so useful when you are shipping a few high priced items where the testing is not a significant part of the costs.

No, it isn't, unless it is used to transmit intelligence.

One of our customers, not content with 100% inspection and testing, wants us to measure things inside, like power supply rail voltages and anything else we can access, and log those values for trends. The idea is to catch things that are trending towards bad limits, before they hit those limits.

Start here and follow the maze of links:

It's astounding. There are religious wars over how to analyze the trends that we would see from 78L05 output voltages.

Of course, doing this would create a blizard of false positives and root-cause-analysis reports, guaranteed employment for QC droids.

We have shipped to that customer, in the last three years, over 3000 pretty hairy electronic boxes. The single field failure was when they broke off the center pins of a pair of male BNC connectors.

Flux-Q.

Hey, don't give up on electronics, it's not that difficult. We could pass the hat around here, collect some spare change, get you one of those nice Harbor Freight DVMs.

Dummy, all you said was "say something about electronics". I did.

Now you're acting like Blobby.

If all you want to do is dispute personalities, he-said-she-said nonsense, why post to SED? You might fit in better on Facebook or Pinterist.

Ohmed any USB gadgets yet? There are 149 posts to this thread so far, with every conceivable opinion about grounding USB shields, and I'm the only one here, so far, that has actually measured some gedgets to see what USB device makers actually connect to what.

All my measurements showed everything hard grounded: USB pin 4, USB connector shell, circuit common, power ground, case ground when it's available. Cables have the shield connected on both ends.

If you really want to argue with me, find a counter-case.

Or do the equivalent measurements on SLRs on some commercial or pro audio gear.

Or keep whining about personalities.

John, all *you're* doing is whining. You really are sounding like Blobby.

OK,idiot. I said nothing about USB cables, or devices, being ungrounded. I really can't help it if you can't read. Your problem.

Inever argued that USB cables were ungrounded. YOu made the absolute statement that shields should *always* be grounded, which is *not* true.

Now you're outside your realm. Not all shields are grounded, particularly pro audio. You haven't a clue what you're talking about.

That's your job in this thread, John. Keep whining or read. Your choice.

No DVM?

Yep, another Blobby remark. Are you two twins?