Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
bd139:
Gah so do I. I wouldn’t wish it on anyone.
--- Quote from: tggzzz on July 03, 2018, 10:01:05 pm ---
--- Quote from: bd139 on July 03, 2018, 09:51:42 pm ---You can have a load of fun with a photodiode, opamp and a DS1054Z. I built a simple photodiode amp with a LM358 and BPV11. Record the power button waveform and load it into the DDS (DG1022Z) then play it back through a 2n7000 and IR LED pointed at the TV slyly with a simple trigger set up wired to a push button with a pull up.
Kids playing up, first warning, second warning clicked fingers and TV goes off.
They nearly fell off the couch in surprise, especially the one holding the remote control.
iPhone camera is no good for this as it has an IR filter on it.
--- End quote ---
Or https://www.tvbgone.com
--- End quote ---
That was the inspiration. And to play with replay as i was pissing around with a yubikey’s innards :)
med6753:
--- Quote from: bitseeker on July 03, 2018, 08:32:27 pm ---
--- Quote from: bd139 on July 03, 2018, 02:29:47 pm ---Tek didn’t put a lot of thought into fixing it once it was built.
--- End quote ---
Tek was ahead of their time. Most things these days aren't designed to even last, let alone be fixed. Fortunately, not everything is crap, but so much certainly is. :palm:
--- End quote ---
If you're implying that Tek designed the 465 or any other equipment to be "unserviceable" or "throw away" I disagree with that statement. Yes, it's DIFFICULT to service but certainly not unserviceable. If it was would they provide extensive service info plus exhaustive parts lists including even the minor nut and screw? I think not. Now could they have made the 465 more modular and easier to service? Sure, but it would have added cost to an already expensive instrument. So there were trade offs and some serviceability lost out.
And think about this. The copyright date on this vertical board is 1971. Which says the Tek engineers were busy bees designing the 465 in the late 1960's. One Tek engineer had the foresight to specify gold plated contacts in the attenuator deck. Gold doesn't tarnish. But could that engineer have anticipated that in 2018, nearly 50 years later, someone would have to get in there to clean 50 years of accumulated dirt/oil/grease off those tarnish free contacts? I kinda doubt it.
bd139:
It was designed with wanton disregard for the next guy after the assembly line. It was however designed with the best parts just in the wrong places.
If you ever have to get the HT inverter you will know what I mean :)
The thing is there’s a reliability Bell Curve. A few units failed rapidly and were repaired at cost and chucked back, most failed a long time ago and were chucked in a skip. What we have is a collection of scopes on the market from which most of the crap has been filtered out.
Perhaps 70% of the normal lifecycle failure risks were outward facing by design but the remaining parts are difficult to get to. Problem is we’re well outside the normal lifecycle now.
med6753:
--- Quote from: bd139 on July 03, 2018, 10:15:55 pm ---It was designed with wanton disregard for the next guy after the assembly line. It was however designed with the best parts just in the wrong places.
If you ever have to get the HT inverter you will know what I mean :)
The thing is there’s a reliability Bell Curve. A few units failed rapidly and were repaired at cost and chucked back, most failed a long time ago and were chucked in a skip. What we have is a collection of scopes on the market from which most of the crap has been filtered out.
Perhaps 70% of the normal lifecycle failure risks were outward facing by design but the remaining parts are difficult to get to. Problem is we’re well outside the normal lifecycle now.
--- End quote ---
Yep, I'm that next guy and I'm paying for it. I got the switch board removed and switch deck clear and cleaned all the contacts. The switch board and vertical board are reassembled. Tomorrow I'll reinstall the vertical board and apply power and keep my fingers crossed.
Edit...yes....It is WAY beyond it's normal life cycle. But so am I and I'm still kicking. :-DD :-DD :-+
Specmaster:
Older style of equipment was not designed to be unserviceable, but because the designers probably could comprehend that their latest piece of artistry would ever fail, they gave the serviceability scant regard, in just the same way as car designers do when it comes down to being able to gain easy access to parts. If however they also had to do any repair work on their designs, then their next creation would have more serviceability (access) built in to them.
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