LMAO. I made an offer. Thanks for the encouragement
Reading HP service manuals helps too. The application notes include how to use it as a network analyser
From experience, HP ones need a reasonable amount of force to make contact and they click and exert pressure on the pcb. The Commodore by comparison is silent, easy to press and nicely sprung and thus passes zero pressure onto the pcb.
Here's some "Tech Tips" for the TDS420 I stumbled across while looking it up to see what you're talking about. Not sure how relevant they are. Looks like the TDS420x were one of the last-last CROs they made before going all LCD; interesting juxtaposition of technologies there.
I'd buy it if I weren't in the middle of a move. For the last year...
mnem
Here's some "Tech Tips" for the TDS420 I stumbled across while looking it up to see what you're talking about. Not sure how relevant they are. Looks like the TDS420x were one of the last-last CROs they made before going all LCD; interesting juxtaposition of technologies there.
I'd buy it if I weren't in the middle of a move. For the last year...
mnem
I have been avoiding this local TDS520D for the last week 'removed' from my watch list eBay auction: #273804851818
LMAO. I made an offer. Thanks for the encouragement
Reading HP service manuals helps too. The application notes include how to use it as a network analyserHP/Tek Manuals are just banana peels placed strategically around the rabbit-hole...
mnem
"...Slip-sliding away... slip-sliding awa-a-a-ay; them more you near your destination, the more you're slip-sliding awaaay..."
From experience, HP ones need a reasonable amount of force to make contact and they click and exert pressure on the pcb. The Commodore by comparison is silent, easy to press and nicely sprung and thus passes zero pressure onto the pcb.
The HP keyboard from the 35/45/34 era has a sheet of heat treated metal with little buckling springs formed into it; pressing the key causes the spring to "oilcan" and touch the contact on the board. The contacts are plated, and the contact force is pretty low; plus, as mentioned, the PCB is strongly reinforced. I don't have every single HP calculator style, but at least the ones with the metal sheet clicky keys are utterly reliable. I've never heard of someone having a flaky contact, especially due to issues with the PCB.
The HP sales people told us that if there was ever a key which had iffy contact behavior due to the spring, the solution was to hit the key really hard (presumably to stretch it out a little). I know a few people who tried that, even though they weren't really having contact issues (engineering students, ya know?). Again, never saw a problem. Maybe the newer HP keyboards were less sturdy, but I don't have anything newer than a 42s to use as comparison.
Before I ask I know this is a RPN vs = question but here goes...
In the stack of equipment I tested this week are a TDS420A and 2246. I know I have enough, actually, more than enough, scopes. But, hey, I can probably buy either one for roughly 100USD, I know they both work, and, well, TEAS.
The TDS420A is pretty cool but the service manual doesn't appear to have schematics, so repair is of the swapping-boards sort. The 2246 is the low bandwidth sibling to the 2465 I have on my bench now. It does appear to be repairable, at least compared to the TDS420A.
*sigh* Typing that paragraph, I realize this is apple to bricks. And that I am leaning toward the TDS420A mostly because I don't have anything quite like it. After all, I don't need another oscilloscope, so I should buy the most interesting one. Nevermind.
Now, a 53310A? I definitely need one of those. That I could use.
Accepted counter offer. I now own a 3310A
Accepted counter offer. I now own a 3310A
Very impressive mnem, take a bow.And now I've finally got a minute to post some pics... I went and did it just to prove I wasn't just blowing smoke up your arse.
As always... the fabricobbling comes easy; its documenting shit that makes it take 3 times as long.Yup.
But that is sufficiently interesting and valuable to other people that it is worth giving it a proper title in a thread of its own. As it is, buried in message 29k of (probably) >50k, nobody will find it again.Nah, bitseeker will add it to the POI's.Not very likely to be found by google and the TekScopes mob.Or add it to 2465B Teardown thread.
*Takes a bow and put on best Elvis grin and southern drawl* "Spank you! Spank you vurry mu-u-uch!!!"
Yeah, I know it'll make a good article... but right now it's just a collection of pictures. I want to get a chance to finish the project and show it installed, but I've been a bit busy this week with the 454 project, fixing musical instruments and being overrun with the little dragonlings.
I'll add it to the big 2465 thread when and if I get a chance to add some narrative.
mnem
My house looks like I'm losing at Jumanji.
HP/Tek Manuals are just banana peels placed strategically around the rabbit-hole...
mnem
"...Slip-sliding away... slip-sliding awa-a-a-ay; them more you near your destination, the more you're slip-sliding awaaay..."Ohh, a Paul Simon fan boy eh
*Takes a bow and put on best Elvis grin and southern drawl* "Spank you! Spank you vurry mu-u-uch!!!"
Yeah, I know it'll make a good article... but right now it's just a collection of pictures. I want to get a chance to finish the project and show it installed, but I've been a bit busy this week with the 454 project, fixing musical instruments and being overrun with the little dragonlings.
I'll add it to the big 2465 thread when and if I get a chance to add some narrative.
mnem
My house looks like I'm losing at Jumanji.I'm glad I inspired you to right a booty fab wrong but when you do the write up keep my name out of it.
Yes it certainly looks nice. Comes with original manual this one as well by the looks and is well looked after. Hopefully insides will tell the same story.
Edit: I got through a few phases when buying HP kit. The i don’t need it phase. Then the I don’t have it phase. Then the I need it phase. Then the I want it to be delivered phase. Then the I’ve got it phase. Then the “will have to pry it from my cold dead hands” phase. 400E and 6284A are there already
HP/Tek Manuals are just banana peels placed strategically around the rabbit-hole...
mnem
"...Slip-sliding away... slip-sliding awa-a-a-ay; them more you near your destination, the more you're slip-sliding awaaay..."Ohh, a Paul Simon fan boy eh
If you don't like Paul Simon, there's something broken in your soul. His stuff is incisive, insightful, and all about everything that's important.
mnem
*Clarity*
*Takes a bow and put on best Elvis grin and southern drawl* "Spank you! Spank you vurry mu-u-uch!!!"
Yeah, I know it'll make a good article... but right now it's just a collection of pictures. I want to get a chance to finish the project and show it installed, but I've been a bit busy this week with the 454 project, fixing musical instruments and being overrun with the little dragonlings.
I'll add it to the big 2465 thread when and if I get a chance to add some narrative.
mnem
My house looks like I'm losing at Jumanji.I'm glad I inspired you to right a booty fab wrong but when you do the write up keep my name out of it.
No. And I've already saved the picture of that booty fab, so you cannae deny it.
mnem
You will figure prominently in my memoirs.
Accepted counter offer. I now own a 3310A