A good digital oscilloscope?

Thanks, JW! It sure seems to be a mighty machine. Well, that's the problem with older scopes: it will take up a large portion of my bench and I'm trying to avoid that. I guess, I'm still after an almost flat (though much less capable) digital scope with an LCD screen.

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On a sunny day (Wed, 09 Dec 2009 08:30:27 -0800) it happened John Larkin wrote in :

Yes, but how to stop that practice? Because it will kill you if it persists, I have designed and build several scopes, never used that isolation feature in one, but who knows. I *DID* post about that solution for DC isolation here here at least once some time ago. Maybe even before 2002. You will find something similar in a lot of equipment.

So, just I will, if I can, boycott anyone who plays that patent troll game.

Wanted to order some more self made postage stamps today from

US is really annoying with this patent trolling, and it is getting worse. As it's economy gets weaker, and it loses influence, I can see a day when the rest of the world just ignores US patents completely, what are you gonna do about it? And that includes ignoring Microsoft products.

So, what will Tek patent next? Data transfer by optocoupler? Acoustical? Any sort of wave? Keep it general :-), if you cannot compete with scopes with the Chinese maybe you can make money with patent trolling?

In the USAF, you were _required_ to remove all jewelry - there are pictures here and there of fingers that had been ripped out by the roots when somebody'd fall and catch their ring on something, and, of course, with electronics, it's the shorts. If you were caught working on electronics with jewelry, you were "subject to disciplinary action." Injured or dead servicemen cut terribly into the budget, you know. ;-)

Cheers! Rich

Jim Thompson a écrit :

I thought that you knew better than to 'Whack Off'?

Don't forget necktie's ! I've seen some nasty injuries because of them.

Remember the ep of "Twilight Zone", where some low-life crook meets some old guy who gives people "what you need". The crook annoys the old guy, the old guy gives him a scissors. "Scissors???" "Trust me, it's what you need." The crook gets into an elevator, and gets his scarf caught between the doors, the car goes up, and it's about to strangle the guy; he finds the scissors and cuts the scarf.

The crook keeps annoying the old guy, and the old guy finally gives him a pair of leather-soled shoes. He puts them on, slips in the street, and gets run over. The old guy says, "That was what _I_ needed."

Cheers! Rich

Chortle ! I never saw that episode.

Regarding ties, I saw one of my team get his face very badly mangled after his tie got caught in the drum belt of an automatic washing machine. Fortunately his tie got cut through freeing him, but the machine didn't stop until the power got cut.

After that it was mandated that clip on ties should be worn. Of course today few service technicians even bother to wear a tie.

Yep. Like that ;-) ...Jim Thompson

I have a friend who lost a finger due to his wedding ring getting caught between an aircraft bus and ground :-(

Of course he's the same one who had the girlfriend-with-a-baby show up at his house, so that girlfriend AND wife greeted him when he came home from work (Tiger-Woods-in-training ;-) ...Jim Thompson

And to add to that, my recently acquired DDS function generator (Rigal DG1022) does have a USB host on it. Hell, even their low end Rigal scope has a USB host on it..(DS1052E)

Check those out..

Makes a greate xmas gift for that starter ;-)

Pretty announcer on there, too :-)

But wait, $600 for a Christmas gift? Ain't that a bit over the top? As a kid I had to work for stuff like that. For example at a meat factory until I had the $400 for my first used and pretty banged up HW100 transceiver.

In my experience the only engineers who ever wore a tie were the ones wanting to become managers.

Today's kid standard, $600 is nothing! anything less, they throw it back at ya!

I supported my 2 sons while they were in technical college. Between the toys and "I must have this" wasn't cheap!

After they graduated, a lot of it never came home. Strangely got lost some where or, it was beat up and most likely not working properly any more..

And for what it's worth, neither one of them ended up in careers using that knowledge. The oldest still lives with me, soon to be 28 doing a job totally unrelated with no ambition to upgrade!.

Sort of sounds like the new age of Obama is already in my home!

Sad. We don't have kids but if we did I'd teach them frugality. Just like my parents did with me. Have it all - get it all, that can easily lead them into a life beyond their means. Or in plain American, credit card debt. Yeah, many of my classmates had those cool Bonanza chopper bicycles and I didn't. But I didn't die from not having one :-)

A friend/client has this license plate frame: My daughters and my money go to the University of ...

But they may still have learned something valuable from it.

Kids moving back in with their folks is almost normal these days. Every other neighbor has them, and usually two or even more. I'll never really understand that. I love my parents but couldn't imagine living with them now (unless they needed that for medical or old age reasons).

Dirk Bruere at NeoPax Inscribed thus:

Smile ! I still wear clip on ties. ;-)

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Hmm, sounds like you may be looking at higher frequencies than I am. (Above a 10MHz?) I'm using a TEK TDS 2022 with 2 GS/s. and don't have any aliasing issues at frequencies below 10 MHz. The averaging function on the digital scope is a nice feature. If you trigger higher and higher on the noise you can 'see' smaller interfering signals... but it's a bit of a losing proposition. The scope triggers less and less frequently and it takes longer to build up an image.

George H.

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Sounds a bit like "Need" one of my favorite short stories by Theodore Sturgeon.

George H.

On a sunny day (Tue, 08 Dec 2009 18:18:50 -0800) it happened John Larkin wrote in :

Many decennia ago, and this also touches on that Tek patent for input isolation that uses a modulated carrier via a transformer, I had a big Philips tube color TV. I also had their first video recorder, a tape recorder with 1/2 inch tape IIRC. As tube TVs in that time has no mains isolation, chassis always live, Philips provided a little box with that recorder, it consisted of a 38 MHz (or there about, basically TV IF) video modulator. The box went into the TV, connected to the IF via a relay IIRC, and provided it with a floating video + audio input. That was one thing, and predated the Tek patent by say, it was from 1968, Tek's applied 2002, makes 34 years YES THIRTY FOUR YEARS. But now the clue, as related to this. To display some waveforms on that big color TV screen (well 61 cm was big in that time), I designed a little circuit, it looks like this: ftp://panteltje.com/pub/TV_scope_img_1679.jpg What is does is create a dot on the TV screen that can be moved in X and Y direction. the 2 window comparators compare the H and V ramp against an X and Y DC voltage. The size of the dot is set by the width of the windows, so a square dot.

When you only use the V comparator, you would get a horizontal line displayed on the TV as set by the Vpos pot. If you put a *signal* on the Vpos pot, you would see the waveform as with a 64 uS timebase... So, if you tested signals that were related to the TV H sync, the display would be rock solid. I used BFY90 transistors to make fast window comparators, and you cloud easily see the spikes on the output of a TTL gate in a 500 kHz signal (is 32 x 15625 Hz). Beautiful, and if course that Philips IF modulator box provided the needed 100% isolation :-)

So, Tek people, here is your prior art, the Philips recorder was the LDL 1000. And here is my prior art to use it as a scope, think I could produce some witnesses who did see it in operation in my place. KIllall patent trolls kill kill kill kill kill kill kill