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| Test Equipment Anonymous (TEA) group therapy thread |
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| tggzzz:
--- Quote from: Peter_O on July 02, 2022, 06:30:03 pm ---I will not drive to Berlin Steglitz, no I will not :scared: https://www.ebay-kleinanzeigen.de/s-anzeige/hewlett-packard-kepco-uher-etc-/2146996418-168-3415 --- End quote --- Some of those 1970s "PCs" fetch surprisingly high prices. |
| bd139:
--- Quote from: tggzzz on July 02, 2022, 08:08:20 pm --- --- Quote from: bd139 on July 02, 2022, 05:11:57 pm ---This is also why I ended up moving from test automation to commercial software. It was hell getting everything to work :-DD --- End quote --- So you moved from something unpleasant to something positively painful? --- Quote ---I was doing it only with the documentation provided for the software and hardware too as I was in a building with airgapped network and no windows :palm: --- End quote --- And the documentation for the commercial software is better? --- End quote --- Well my options were: 1. Trying to drive wonky GP-IB cables and devices from Visual Basic through a hooky ISA card that only worked with 16-bit windows so I had to write drivers for NT for it in a room with no natural light other than 30 minutes at lunch time as it was dark in the morning and dark in the evening. The only break being writing CoCreate workmanager's mutant version of BASIC that sort of half ran on Solaris and half on Windows. Or munging bits of Perl on a manky Ultra 2 desperately trying to replace an S390 batch job before they had to pay IBM another vat of kidneys. 2. Get paid 3x that for a trendy job at a web app startup which involved doing 2 hours of work a day in a swanky well lit windowed office in the city and spend the rest of the time pissing around, getting drunk after work and getting into the more interesting kinds of trouble ;) I chose well 8) |
| mansaxel:
--- Quote from: Messtechniker on July 01, 2022, 12:20:12 pm ---What kind of soldering (station?) are you using for thick cables? Our everyday 80 W soldering station wont cut it, right? --- End quote --- There are ingots of solder you drop in the lug when it's held in a vise. Then you heat it with a torch and dip the cable in when it's hot enough. Me, I soldered two Anderson Powerpoles yesterday, to 0,75mm2 cable. TS100 with chisel tip. That little one packs a punch. It will do 2,5mm2 too but that's a bit of a strain. It's also important, in the TS100 case, to run it off a laptop PSU at perhaps 19V. 12V won't do. OTOH, I have a 300W monster that I've soldered copper water pipe with. It can be done. |
| Robert763:
--- Quote from: factory on July 02, 2022, 07:48:19 pm --- --- Quote from: factory on July 02, 2022, 06:03:05 pm --- --- Quote from: mnementh on July 02, 2022, 05:34:01 pm --- --- Quote from: factory on July 02, 2022, 05:11:47 pm --- --- Quote from: m k on July 02, 2022, 04:24:57 pm --- --- Quote from: mnementh on July 02, 2022, 04:08:13 pm --- --- Quote from: factory on July 02, 2022, 02:05:50 pm --- --- Quote from: mnementh on July 02, 2022, 03:05:23 am ---Uggghhh... Okies... anybody got any tech ref on the monitors used in these HP scopes? I understand the difference between the two implementations is the 54621D and family use 32-grayscale palette, while the 54600A and family use a 2-grayscale palette. 54645A/54600A use HP 2090-0316/DataRay CDM-7SF191, the 54621D uses HP 2090-0384/DataRay CDM-7SX191. My searches in the available HP SMs and on the internet turned up bupkis. Before I go guessing based on poking around with my scope, does anybody here have actual pinouts and or schematic for these monitors? Tomorrow I figured I'd start looking at the CLIP package from the 54645A and see what I can find there. Maybe lookit the video chip on each and see if I can find some datasheets. :-// mnem :=\ --- End quote --- I'm would be surprized if they aren't interchangeable, they look to be standard bought-in monochrome monitors to me, the different greyscaling would be something done in the video processing, on the mainboard and the output just a video signal. Certainly I saw the video signal on the diagrams for the 54645A, that was posted a few weeks back. I think the other connections are power (+15V?), an external pot for brightness, can't remember what else there is. The chip on the Hitachi CDM-7SF191 board in my 54615B is a uPC1379C, this is a sync signal processor IC intended for small B/W & color TVs and does the vertical & horizontal stuff, that is done by more discrete parts on the earlier scope displays (the only one that a diagram seems available for).David --- End quote --- Yeeah, I'm not sure. IIRC, these are actually a TTL digital input monitor, so not that simple. I need to do some research. :-+ mnem :-/O --- End quote --- Neck board has an added 74S03, so maybe 16 new shades of gray. CNC industry have had small screens for quite some time. Possibly already have an almost ready replacement LCD. --- End quote --- The 7403 is on the CDM-7SF191 in the 54645A/54600A/54615B, the newer CDM-7SX191 looks to use one or two transistors instead. The larger monitor boards both look to use a similar signal processor IC, layout has changed a bit, need to find better pictures. The boards in my CDM-7SF191 from 54615B, taken before the re-capicide. Pictures of CDM-7SX191 from ePay listing. David --- End quote --- Oooh... good idea, looking on fleaBay for pics rather than beating my head against nonexistent documentation. :-+ I've done this before; no idea why I didn't just start there. :-// So possibly the difference is just support for the uPC1379C. VCC/GND are the same pins; I need to trace out the circuits for the BRIGHTNESS pot and see where they are in the pinout. mnem :-/O --- End quote --- I missed a word out, they both look to use a similar IC on the larger CRT board, just we need better pictures of the newer 7SX version to confirm if it is the same IC. I can't find any teardowns showing this, hopefully someone on here can provide some pictures. ;) David --- End quote --- From the Agilent 54654N diagrams, that were linked to recently. The monitor cable has three connections for +15V and ground, six total. Three connections for the intensity pot. Last four connections are half bright, full bright, HS (Hsync?) and VS (Vsync?). Interesting the HS goes through a 74393 to provide the probe compensation signal. HS & VS come from the big Jackal custom IC and the half bright, full bright from a PAL IC. Other relevant pages have been cropped, rotated & added below. This forum post suggest the Hsync is 19.72kHz and the Vsync is 60Hz. https://www-elektronik-si.translate.goog/phpBB2/viewtopic.php?t=30373&postdays=0&postorder=asc&start=30&sid=c8ec2c01726d6cc1ee123fe5ebbe8c3d&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp Guess I need to locate those on my 54615B, to try & narrow down where my intermittent horizontal roll problem is, but it's not the same board. David --- End quote --- Those signals are the same as used on the HP 892X series of radio test sets. I do have a couple of spres of those but: A/ heavy to post B/ probably too long. However replacement LCD kits are available for those AND a GONBES 8200 or 8220 video converter will drive a VGA screen from a 892x www.ebay.co.uk/itm/111462755254 EDIT: Roberto Barrios hdetails the 8920 mod here https://rbarrios.com/projects/8920lcd/ Note the composite video is generted byy a simple circuit in the 892x I'll dig it out. |
| mansaxel:
--- Quote from: mnementh on July 01, 2022, 09:41:53 pm --- Most of the horror stories I read about are exactly the opposite: some monkey-butt thinking they're going to "stick it to da man" because they read somewhere that the electric company has to allow you to backfeed and that they have to pay you for the electricity you generate. In those cases, you as a "power plant" have to ensure QOS and they will have very specific demands as to the hardware they allow you to connect to their grid. In a "consumer-only" scenario, I believe there is going to have be some form of power conditioning or isolation that has to be installed between "your grid" and "their grid"; even if it is as simple as you using a big-arse transformer to charge your battery bank when needed. I do not believe they will allow you to connect their grid directly to the solar-powered/generated AC you use for your own household AC power under any circumstances. mnem :bullshit: --- End quote --- Here, it is allowed, and direct, and the power company can only refuse under some specific technical circumstances. I have talked to people who pocket several 1000s of SEK (/10 to get more familiar money) per month when the sun shines. Thing is that most inverters are being built to be grid-tied, so already do the important stuff like track the grid for all relevant parameters. You have to have a system that shuts down when the grid disappears, unless you've done a lot of legwork to insure safe island operation. Their concern is linesmen safety so the requirement is an OR system; that will connect either grid-tied in presence of grid, OR run from a controllable power source like a genset. In that case, one connects the inverter to the separable island, and it will shut down when the mains goes, and come back when the tie is severed and the independent power is back. I'd really want the disconnect too since there's no chance in hell I'd try driving the entire block; we're perhaps 50 houses on the closest transformer, all having 4x10mm2 feeders and from 16 to 25A fuses per phase. I believe companies like Victron do this, turn-key. |
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