A good digital oscilloscope?

On a sunny day (Mon, 07 Dec 2009 20:21:56 -0800) it happened John Larkin wrote in :

Nothing special, my DVD remote does the same: ftp://panteltje.com/pub/DVD_remote_fluorescent_buttons_img_1676.jpg

On a sunny day (Mon, 07 Dec 2009 23:29:59 GMT) it happened Jan Panteltje wrote in :

Yes that was it, VR108, scope is as new again :-)

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Not sure what sort of noise you are looking at, but I love my digital =91scope for looking at noise. The trick I use is to trigger right up at the top of the noise. Then I put the scope in average mode and you get an image that looks like the auto correlation function. My colleague has dubbed this the Quasi =96 auto- correlation function, =93Quacf=94 for short and of course pronounced quaff. (Ahh, nothing like a good beer.) If you ask for the FFT of this =91trace=92 you get a much better picture. But I=92ve become very good at reading quacf=92s.

George H.

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Hee Hee, Yeah once they figured out to put colored 'voltage' knobs that match the color on the display I became a digital scope fan.

George H.

Try some strontium aluminate. It's something like 10x better a light storage thing than the old ZnS stuff.

John

On a sunny day (Tue, 08 Dec 2009 07:00:51 -0800) it happened John Larkin wrote in :

The DVD remote in the above link *is* strontium aluminate, I just did the 4 minute test,

I love our TPS2024. 200 MHz, and all four channels and the trigger input are fully floating. Wanna clip the probe ground lead onto the source of a fet that's flailing 400 volts off ground? No problem.

John

Tasty.

What's C-to-ground like, is it basically a differential input (2 x 1M ||

Tim

I used to have one in round but gave it to a friend whose radio transceiver had one in there that died.

Back in those days watch dials would be readable all night, not nearly have that much decay. That is no longer the case, no matter what fancy material they use.

A friend of mine used to take off the aluminum front panels of similar equipment and, , put it in the dishwasher. He's divorced so I guess no issues from that department :-)

Afterwards it really looked like new. I was surprised that he never had a case where the lettering came off, that's what I'd be conerned about.

On a sunny day (Tue, 08 Dec 2009 10:58:50 -0800) it happened Joerg wrote in :

No problem, you can have it if you want: Tritium:

On a sunny day (Tue, 08 Dec 2009 11:01:40 -0800) it happened Joerg wrote in :

I use alcohol, 'spiritus' in Dutch.

Shame about that antediluvian CF card slot that can't write to even a

I deal with high gain amplifiers (80 dB gain, around 256 channels per system) sitting in a sea of noise. Trying to pick out switching power supply noise, digital noise, AM & FM radio transmitters, and ground loop noise from other equipment is difficult with digital scopes since the structure of the noise is lost. I'll revert to frequency domain (usually a swept analyzer) to pick out the offending frequency if it's from a switcher, clock or radio station, but logic noise doesn't show up well in the frequency domain. The sweep rep rate of digital scopes is better than days of yore, but still not as good as a 30 year old

Not that I'm anti-digital scope, I just like using the tool that makes the task at hand easier to deal with.

The TDS220 at work has terrible noise. My Tek2230 does much better.

"Tim Williams" wrote in news:hfm64q$k3h$ snipped-for-privacy@news.eternal-september.org:

it's probably just a isolated power supply and isolation from the cabinet.

differential inputs are more expensive to implement.

Did you see my earlier post about TEK moving production to China?

also,TEK has bought Sypris Test & Measurement,a third-party supplier of repair and calibration services;so it appears they're trying to re- establish the service centers they USED to have around the US,but closed the last of them back in 1999.

It only took them TEN years this time to learn they messed up closing local service centers..... Danaher really needs to "clean up" TEK T&M management.(clean OUT) Those guys never did have a clue about service. All they know is Beaverton and the factory environment.

Hmm,kinda like our politicians in DC today...

Just snap a photo of the screen.

John

Something like 35 pF from the BNC outer to ground. I'd prefer less. But it's truly floating with pretty much infinite CMRR. I think it's a microwave-range FM signal link or something.

John

I ordered some cards direct from Tek, turned out they were standard (but obsolete) Sandisk 256M CF cards. I think Newark wanted $250 or something insane like that.