CandyLand Posted August 19 Share Posted August 19 (edited) Some of you may have been interested in my recent adventures in induction/capacitance testing on my current build...Well it finally showed up, It is MASSIVE and ridiculously heavy (I can't lift either box), beginning to see where all the money was spent...HP vector networking analyzer 89441a and frequency generator, this is so very exciting as an upgrade to the workbench...Let's dig in! (after I figger out how to even get it in the shop) Edited August 19 by CandyLand 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 Holy crow, this thing is intense and it aparently diddnt get damaged in shipping...So far so good. 3 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 It should be mentioned, the nano VNA actually has really good reviews and only is like 60.00, and quite accurate on the relatively low frequency found on arcade machines...This HP not cheap, more of a once in a lifetime kind of upgrade, and somewhat outdated with the floppy disks and all, Siglent make a comparable modern version, but be warned the cables (not included) can get up into the 10k (apiece) range depending on what you are measuring...For sub Gig frequencies however far more forgiving. 1 Link to comment Share on other sites More sharing options...
Gemini2544 Posted August 19 Share Posted August 19 Must be old by the 3.5 floppy & CRT screen, How old is it? 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 25 minutes ago, Gemini2544 said: Must be old by the 3.5 floppy & CRT screen, How old is it? Floppy stuff isn't really isn't in my wheelhouse, I only went old because it actually goes down to a DC baseline, where new ones seem to start out at around 10hz...Hopefully it will be ok since not really doing RF stuff just planning some Smith Chart cap/inductance testing for rewinding yoke coils primarily...It is a scary/exciting machine I won't lie, thinking even the power lines above my house may even affect readings during certain times of day...I dont have the calibration standards yet, and really cant say at the moment when I can even afford them, But for now just getting it set up.😉 1 Link to comment Share on other sites More sharing options...
Gemini2544 Posted August 19 Share Posted August 19 It might need recapping it's self. Must be 25 odd years old. Have you turned it on yet? Post some pix of it on, love to see it in action. 2 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 33 minutes ago, Gemini2544 said: It might need recapping it's self. Must be 25 odd years old. Have you turned it on yet? Post some pix of it on, love to see it in action. You actually bring up a good point...If I was to guess, there probably is also some kind of memory battery in there too, I only have 3 of the 5 manuals so far so couldn't say for certain...Slow and careful, but yes I will turn it on here, At least get into service mode and look at what options are actually on there. 1 Link to comment Share on other sites More sharing options...
Gemini2544 Posted August 19 Share Posted August 19 You will also need a 5 pin Din keyboard too! 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 37 minutes ago, Gemini2544 said: You will also need a 5 pin Din keyboard too! Hmm, seems you may be correct, This is actually dissapointing news at the moment , I will have to look into this. 1 Link to comment Share on other sites More sharing options...
Gemini2544 Posted August 19 Share Posted August 19 10 minutes ago, CandyLand said: Hmm, seems you may be correct, This is actually dissapointing news at the moment , I will have to look into this. I'm sure I have one here in OZ! but you in the US, I'm sure you'd find one. 1 Link to comment Share on other sites More sharing options...
needlebat Posted August 19 Share Posted August 19 12 minutes ago, CandyLand said: You will also need a 5 pin Din keyboard too! Adapters to 5pin DIN to PS2 female should do the job? Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 (edited) 9 hours ago, needlebat said: Adapters to 5pin DIN to PS2 female should do the job? Hoping that means modern keyboard with adapter...The study on that is not really clear however much talk about drivers, Hate for "clunky" adapter, and the over-all lamenting over the lack the clicky goodness of nostalgia...Not that I would care, as long as it works. Edited August 19 by CandyLand 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 19 Author Share Posted August 19 (edited) Good grief this thing is nasty, Killing baby slowly, I would seriously consider the Nano if you guys get into this (Be careful of counterfeits, it is open source software) and would highly recommend a reputable vendor...This one, well, I am not a rich girl and this is aparently some heavy hitting high dollar lab equipment, this may take awhile since there is also little/no support on it either, except for what you guys volunteered...Just wanted to say thanks. Edited August 19 by CandyLand 1 Link to comment Share on other sites More sharing options...
needlebat Posted August 19 Share Posted August 19 5 hours ago, CandyLand said: Hoping that means modern keyboard with adapter Modern-ish. The PS2 keyboard is electrically compatible with the DIN (please check to be certain, 30 year old memory), but not mechanically (the plug). The adapter should fix this, and there are plenty of PS2 keyboards around still. Do also check that the keyboard on the HP is the same as PC used to be. I have a serial keyboard (+-12v RS232) that looks all the world like an IBM clone PC keyboard, and that just won't work 🙂 Link to comment Share on other sites More sharing options...
jeremybh1 Posted August 21 Share Posted August 21 Following - so the concept is measure capacitor breakdown / ripple under custom load (happy to hear about your ideas for power) and use network analyser to plot / trace at CRT appropriate frequencies opposed to the industry standard of 100/120KHz which is way out of what we need for arcade etc? 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 21 Author Share Posted August 21 (edited) Well....It does plot inductance/capacitance at any specific given frequency, A component, Lets say an inductor (Yoke coil) will exhibit different characteristics at different frequencies, Go to its sweet spot of inductance then potentially become capacitor, Standing, reflecting waves the wire used also contribute to this phenomenon. There is some news on this project however... I just bought a rolling tool cart to at least get it up off the floor! Edited August 21 by CandyLand 2 Link to comment Share on other sites More sharing options...
CandyLand Posted August 21 Author Share Posted August 21 (edited) Getting closer, still missing that keyboard....And the calibration kit. Edited August 21 by CandyLand 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 21 Author Share Posted August 21 It should be mentioned this is more about circuit design and prototype, not really about restoration, Not your average go to on a typical workbench. 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 22 Author Share Posted August 22 (edited) Maybe I didn't say that right...A sine wave travels down a wire , but when it hits a dead end it reflects back, Normally a problem associated with RF stuff, but has me thinking it isn't going to actually follow the original frequency, so technically that would be double, That could be a problem depending on the circuit...That electric paint project I have been working on most likely wouldn't fall into that category, but it still could be considered capacitance bouncing from ground to a potential like it does....The math on this sucks, beyond me even being advanced Calc but hopefully we can measure that Beyond a conventional ESR meter reading...Anyway food for thought. While we wait for that calibration kit and keyboard... I am going to make a wood top for this cabinet (Beveled stile/rail glue joint as I set up the wood shaper) so I can turn the machine facing forward anyway Edited August 22 by CandyLand 1 Link to comment Share on other sites More sharing options...
needlebat Posted August 23 Share Posted August 23 I remember trying to model networks in matlab; the measurements and the theory never matched up 🙂 Link to comment Share on other sites More sharing options...
CandyLand Posted August 23 Author Share Posted August 23 (edited) 2 hours ago, needlebat said: I remember trying to model networks in matlab; the measurements and the theory never matched up 🙂 *Jennifer laughs, Ya, it is not as cut and dry as the "Go get a good multimeter" advice you generally get on fourm sites, it can actually get really interesting...Theory is an interesting subject as it would lead one to believe it could only somewhat correct or possibly somewhat wrong, Radiation Laboratory #23 (I believe, dont quote me) Is actually post war Monitor secrets heavily posed as fact over Theoretical, but in later years Wells Gardner was back to "Theory" as specified on literally page one. But it should also be noted, between the years of 1940 and 1980 alot of important improvements were also made in monitor technology, Deflection angle to name one vastly improved over those years as part of the theory of operation, and a better understanding. And from a historical standpoint the Consumer television falls in the middle of that, around 1954. Edited August 23 by CandyLand 1 Link to comment Share on other sites More sharing options...
CandyLand Posted August 25 Author Share Posted August 25 (edited) Glue up finished (in solid 1" oak, not ply) and cut to size...Ready for some wood sealer, stain, and poly. Edited August 25 by CandyLand 1 Link to comment Share on other sites More sharing options...
needlebat Posted August 25 Share Posted August 25 What an interesting room... Link to comment Share on other sites More sharing options...
CandyLand Posted August 26 Author Share Posted August 26 (edited) That's my kitchen at the moment (in a state of chaos), I actually have over 100 arcade machines and they cycle through here perpetually, that little mega touch is about to be gone through next and cleaned up, I have been doing the monitor work on a Red Baron project out in back, that room is far more interesting *(Just an opinion) But Jennifer regresses...That table top though is also interesting, it was actually made from 10 pieces of matched oak, jointed, milled, glued, surfaced and sized, Pics don't do it justice, It is a damn pretty piece of wood. Curiously, That electric typewriter on the mega touch got parted out last night, I got a few chips and resistor networks out of it... Edited August 26 by CandyLand 1 Link to comment Share on other sites More sharing options...
oldhank Posted August 27 Share Posted August 27 Cheeseballs 1 Link to comment Share on other sites More sharing options...
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