A good digital oscilloscope?
in [Design]
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From: Joerg on 8 Dec 2009 13:58 Jan Panteltje wrote: > On a sunny day (Tue, 08 Dec 2009 07:00:51 -0800) it happened John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in > <aeqsh5lt88otd57hp85t72m4o02ig3f6nh(a)4ax.com>: > >> On Tue, 08 Dec 2009 12:42:41 GMT, Jan Panteltje >> <pNaonStpealmtje(a)yahoo.com> wrote: >> >>> On a sunny day (Mon, 07 Dec 2009 20:21:56 -0800) it happened John Larkin >>> <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in >>> <upkrh5lpbge5a690oth9tsaqp7san0nnj6(a)4ax.com>: >>> >>>>> But the higher end ones with long-delay phosphor glow in the dark. Once >>>>> I slept here in the lab on a make-shift bed. There was this eerie blue >>>>> glow from over yonder. >>>>> >>>>> Digital ones are easier with the colors, of course. If they just hadn't >>>>> picked blood red for the FFT and bonbon purple for Ch3 on mine. >>>> >>>> This is a 4FP7 airborne radar display tube, ca WWII. It has a fast >>>> blue phosphor that excites a slow yellow one. Blasted with electrons >>>> (or a flashlight) it will glow for several minutes. >>>> >>>> ftp://jjlarkin.lmi.net/4FP7.jpg >>>> I used to have one in round but gave it to a friend whose radio transceiver had one in there that died. >>>> John >>> Nothing special, my DVD remote does the same: >>> ftp://panteltje.com/pub/DVD_remote_fluorescent_buttons_img_1676.jpg >> Try some strontium aluminate. It's something like 10x better a light >> storage thing than the old ZnS stuff. >> >> John > > The DVD remote in the above link *is* strontium aluminate, > I just did the 4 minute test, > http://en.wikipedia.org/wiki/Phosphorescence (scroll down) > still clearly visible, not adapted eyes, also after 5 minutes. > The color also matches tha tbird... > They say the ZnS stuff is no longer used... > The real 'hot' stuff I remember from my youth was 'radium', > radium on watches, clocks, and even on some light switches. > That was all no longer allowed at some point. 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 8 Dec 2009 14:01 Jan Panteltje wrote: > On a sunny day (Mon, 07 Dec 2009 23:29:59 GMT) it happened Jan Panteltje > <pNaonStpealmtje(a)yahoo.com> wrote in <hfk360$i5i$1(a)news.albasani.net>: > >> Just be studying that diagram, there is an intensity preset pot, good, >> maybe that is all I need to tweak, (it is too bright, cannot dim it). >> Could accidently have turned that during calibration... > > Yes that was it, VR108, scope is as new again :-) A friend of mine used to take off the aluminum front panels of similar equipment and, <gasp>, 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. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jan Panteltje on 8 Dec 2009 14:09 On a sunny day (Tue, 08 Dec 2009 10:58:50 -0800) it happened Joerg <invalid(a)invalid.invalid> wrote in <7o7lveF3obbsiU2(a)mid.individual.net>: >>>> ftp://panteltje.com/pub/DVD_remote_fluorescent_buttons_img_1676.jpg >>> Try some strontium aluminate. It's something like 10x better a light >>> storage thing than the old ZnS stuff. >>> >>> John >> >> The DVD remote in the above link *is* strontium aluminate, >> I just did the 4 minute test, >> http://en.wikipedia.org/wiki/Phosphorescence (scroll down) >> still clearly visible, not adapted eyes, also after 5 minutes. >> The color also matches tha tbird... >> They say the ZnS stuff is no longer used... >> The real 'hot' stuff I remember from my youth was 'radium', >> radium on watches, clocks, and even on some light switches. >> That was all no longer allowed at some point. > > >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. No problem, you can have it if you want: Tritium: http://en.wikilib.com/wiki/Tritium Tritium watch: http://en.wikipedia.org/wiki/File:Tritium-watch.jpg Tritium alarm clock: http://www.ultralux.ch/de_shop.cfm?cmd=detail&id=48&pid=142¤t=1&mainkat=5
From: Jan Panteltje on 8 Dec 2009 14:10 On a sunny day (Tue, 08 Dec 2009 11:01:40 -0800) it happened Joerg <invalid(a)invalid.invalid> wrote in <7o7m4oF3obbsiU3(a)mid.individual.net>: >Jan Panteltje wrote: >> On a sunny day (Mon, 07 Dec 2009 23:29:59 GMT) it happened Jan Panteltje >> <pNaonStpealmtje(a)yahoo.com> wrote in <hfk360$i5i$1(a)news.albasani.net>: >> >>> Just be studying that diagram, there is an intensity preset pot, good, >>> maybe that is all I need to tweak, (it is too bright, cannot dim it). >>> Could accidently have turned that during calibration... >> >> Yes that was it, VR108, scope is as new again :-) > > >A friend of mine used to take off the aluminum front panels of similar >equipment and, <gasp>, put it in the dishwasher. He's divorced so I >guess no issues from that department :-) > >Afterwards it really looked like new. I was surprised that he never had >a case where the lettering came off, that's what I'd be conerned about. I use alcohol, 'spiritus' in Dutch.
From: Spehro Pefhany on 8 Dec 2009 14:36
On Tue, 08 Dec 2009 10:28:27 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 7 Dec 2009 22:21:43 -0600, "Tim Williams" ><tmoranwms(a)charter.net> wrote: > >>"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote in message >>news:oFhTm.36236$kY2.31856(a)newsfe01.iad... >>> My Tek 485 serves me well. I do have a small assortment of digital scopes >>> for portable use to gather basic data and road trip testing how ever, I >>> find that my 485 still gives me nice results at the bench as long as I >>> don't need live digital storage. >>> It's the only scope I have that I can take full advantage of my active >>> Fet probes when I need them. >> >>486 is on my Wish List. And 2465. Yessss, my preciousss.... >> >> >>Tim > >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 Shame about that antediluvian CF card slot that can't write to even a 2G card. 8-( |