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| Test Equipment Anonymous (TEA) group therapy thread |
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| Vince:
--- Quote from: xrunner on June 29, 2022, 02:42:39 pm --- --- Quote from: Vince on June 29, 2022, 02:34:51 pm ---Exactly. And floppies are still way cheaper and faster and more convenient to move data around, than HAM radios data links or smoke signals. I will have a floppy any day thanks ! :-DD --- End quote --- Vince here's how they will tell you to move data around your lab with a floppy disk - --- End quote --- " No worries boss, will use your USB stick as soon as you replace that old TDS5XX with its 20K dollars USB modern equivalent ! Oh you don't want to cough the cash ? Well give me my floppies back then and STFU ! " :-DD |
| Vince:
--- Quote from: tggzzz on June 29, 2022, 03:00:36 pm --- --- Quote from: bd139 on June 29, 2022, 01:11:48 pm ---Ok some quick lunch time debuggery today. I have located the 465B failure and for once it's not a tantalum capacitor. Well that's not true, there is one shorted tant but that's not what is killing the 5V rail. It's much much worse! I eventually chased it around and found out that it only borked the power supply if channel 1 was selected. So I traced that down to the channel switch. And yep, it's a tek ASIC has gone short. But it's not an ASIC! Part is labelled Tektronix 160-0204-00 which is actually a 63S141J fuse programmable 256x4 PROM. Manual confirms this. Fortunately it's documented! Now the IC is available for £23 which is a bit much so I am considering what other options I can use here to replace it. The actual original blank PROM is fairly unobtainable and I'd probably fuck it up programming it. Will mull on it for a few days... --- End quote --- What's the clock rate for U1705? Given that A3-7 are probably constant, the limiting speed appears to be the tsu of the Q-PROM-D loop on U1705. If slow enough, then bitbang an arduino class processor. Failing that: * PAL/MACH/CPLD * duplicate the logic in SMD TTL/CMOS on a PCB carrier plugged into the PROM's socket * EPROM/EEPROM --- End quote --- ... or just program a freaking memory to begin with ?! :-// If I have to put a square peg in a square hole, I first try to see if I have square pegs laying around, before I resort to try to make a round peg fit :-// |
| Specmaster:
--- Quote from: bd139 on June 29, 2022, 01:37:44 pm ---More 465B shenanigans. So I figured I'd just do a short check on the IC and see if it was pin specific. Well it was. Only the A3 line pin 4 was short to ground which is the CH1 select line. Figured the best option here would be to just bend that pin out and see if the rest of the scope works. So here it is giving me the finger: Of course I pulled the shorted tant out of the HV supply as well just to see if that would come up, but without a suitable fuse I'm not willing to power it the HT up in case I blow out the inverter transformer. So next step is to find a suitably priced fuse and stick it in and see what else is broken and if it's worth spending £23 on an IC for :-DD The scope does power up now but without HT. Progress! --- End quote --- Well you beat me to it, I was going to say, just isolate Channel 1 for the time being and see what turns up :-+ |
| Kosmic:
--- Quote from: med6753 on June 20, 2022, 01:48:03 am ---An auction score from the FB group Old Tek Scopes. He didn't state how much in total he paid but he did state that the plug-in's were as little as $8/each. Given the total it still adds up to a significant chunk of change but the total amount of gear is unreal. :o And I thought two Type 547's, five plug-in's and two carts for $200 was a score. ::) ;D --- End quote --- And now, the video :) |
| mansaxel:
--- Quote from: Vince on June 29, 2022, 01:22:08 pm --- Maybe you both misunderstood what I mean when I said I found FDD equiped TE "cool"... I thought it was obvious I meant it in an irrational / vintage interest kind of "cool", like we find our old glowing Tek scopes "cool"... See ? I can stir it too when I want ! Hey I might morph into a Dragon one day who knows ! :-DD --- End quote --- I get it, and I'm probably too fed up with that GENERAL ERROR dude to not bite. :-DD Here goes: To me, the floppy, as an ornament on TE, is kindasorta both a good and a bad thing. Because it mostly implies the onset of times when TE started being an embedded computer with an acquisition front end. That could have been a seriously cool era, or it could have been times littered with bad engineering decisions in the interest of vendor lock-in. And it as things go is a bit of both. The good grandchildren of this are the China scopes that have a web server, a real operating system, and a SSH daemon running. The less stellar ones are all once-really-cool pieces of TE that still could be really-cool pieces of TE were it not for the criminally outdated Windows version and cobbled-together software on top making assumptions that mean upgrades are impossible. That the M68K (IIRC) scopes with floppies like the ones discussed earlier feel fresher than later Windows versions speaks volumes. IMNSHO, floppies were just something that people without IEEE-488 had to use, and while they were le cool back then compared to a photo-chemical registration process, they still sucked. But in a forest of shrubbery, the cat is a lion.. Today, we've got Ethernet, and even if all we do is emulate serial or similar on top, it still is much better. There are edge cases mostly related to timing when other systems are better, but Ethernet is eating their lunch too with PTP for sync, and with some clever tricks you can tell Ethernet to do priority for some kinds of traffic. None of this of course will be possible on the UNI-T's and Anengs of networking, like Netgear or D-Link, but there are things that obey and control much better than them. |
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