An unusual Oscilloscope phenomenon

Brings back pleasant memories. I donated my HW101 to the Boy Scouts radio club many years ago. I wish I still had my HW 16 - lots of wee hours CW with that (my first) rig.

Ed

But it's ugly orange. ;-) I think I'll spring for the Bosch. I want to rip up some bamboo flooring and inlay a hearth in front of our fireplace. I can't figure out another way to make the cuts against the wall.

I now have seven cordless drills (will likely give one to my son). I just bought a little Bosch 12V Li-Ion to match the impact driver. 100 years ago a cordless drill was a brace and bit. ;-)

It's not only about waveforms-per-second, it's also about the capture and display engine as well. The manufactuers have various technologies (e.g. Tek Digital Phosphor) to make their digital scopes have an "analog type" display and response, and they work superbly. In fact they can be better than analog in many respects. But that performance costs money, so you have to start paying around say the $5K mark before you get a digital scope that really performs like an analog one in terms of variable display intensity, response time, and capture dead-time. See here for more info:

Lower end scopes don't have these "analog like" display technologies, so then "waveforms-per-second" is pretty much the basic benchmark. Modern scopes are pretty darn good though, and even the low end cheap ones are streets ahead of previous generation DSO's. Those who haven't used a modern high end digital scope don't know how superb they can really be.

With modern fast real-time deep memory scopes, aliasing is pretty much a thing of the past.

Might make an interesting future blog...

Dave.

OK, how about "image charge" then?

Jeroen Belleman

Is that an Agilent 6000 series scope I see in front of you?

Nice. Would be even nicer without the attached city :-)

Possibly. It even happens in standby power so maybe it's the SMPS in there.

At least you've got the memories, that's all that really counts. I donated my HW101 to a ham in former East Germany after the wall fell. Back then they didn't have the funds to buy western quality gear. I kept the older HW100 because that has a white-knuckle supply, direct rectification and Cockroft-Walton cascade from 230VAC mains. Plug it in the wrong way ... *BAM*. He got the good set, with original power supply and the whole thing looked hardly used, almost like new. He was really happy.

didn't

Look at the bright side: It could be worse. My Chinese meters here are bonbon-purple. Channel 3 on my DSO is bonbon-pink.

I am very impressed with the little Durafix single Li-Ion pistol-style electric screwdriver. $15. We had to build a large step box for our Rottie because he has trouble getting in and out of the car. The long deck screws were hard to turn but it muscled them in. Sure saved me a blister.

That's the reason you see lots of six inch wide copper bonding straps in radio studios. They use one and a half inch straps to connect between the equipment, and the bonding straps.

The cordless one? Or do they have a plug-in one now?

We still used those back in industrial arts class in the mid-'80s since they didn't have enough electric drills to go around. (I imagine they'd had them for decades!)

We had pretty good instructors... of the many demos they gave, I remember one where the guy said, "You want to know the difference between this cheap Black & Decker power drill here and this much-more-expensive Milwaukee? Watch this?" -- Guy wraps his hand around the chuck on the B&D, hits the trigger with his other hand and... chuck doesn't turn, the drill just sitting them humming a bit. "Don't try this with the Milwaukee!"

---Joel

You put the glue on the surface and let it dry, and lay thin pieces of wood across it. Put the glue on the formica, let it dry, and lay it on top of the shims. The shims have no glue, so don't stick. Line the formica up, on top of the shims, and one by one take the shims out and let the formica stick to the surface.

I've seen it done on those "home improvement"-type TV shows. :-)

Cheers! Rich

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rnatezone.com/eevblog/

After watching your video, for some reason I was reminded of Starbuck Flying and his computer adventures. Aren't you glad he doesn't have a scope?

:D

Michael

They don't fix it - they prevent it. You contact cement the veneer & the top and let the cement dry. Lay shims on the top, lay the veneer on top of the shims. Line the veneer up properly, then withdraw the shims one at a time, pressing the veneer down onto the top as you go. You cut the formica before you start, such that it will hang over the top by about 1/4" on all edges. After sticking the formica to the top, you use a router to trim the formica to be exactly even with the top on all edges, with a bit of a bevel on the dege of the formica.

Ed

The waveforms-per-second depends on the sample rate, the length of the acquisition memory and the throughput of the display system. Another thing that limits the refreshrate is the refreshrate of the display. The latter can be circumvented by adding several swaps into one signal.

That depends on the samplerate and the bandwidth. If the samplerate is lower then the maximum bandwidth expect aliasing effects unless it is a sampling oscilloscope.

Where do you get reports on the Harbor Freight stuff? I'd like to be able to see what others think about what I might buy - like their 12' sliding compound miter saw.

Sometimes they're good for power tools that will be used infrequently. The stuff I've bought from them for light use has never disappointed - but I haven't used it either under harsh conditions or extensively.

Ed

Wow. You're making me drool.

But a lot of the time we look out the kitchen window and see a wall of fog.

John

Hope This Helps! Rich