Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
m k:
--- Quote from: Neper on July 03, 2022, 01:12:09 pm ---
--- Quote from: m k on July 03, 2022, 12:39:03 pm ---
--- Quote from: Neper on July 03, 2022, 11:26:38 am ---
--- Quote from: Vince on July 02, 2022, 07:24:10 pm ---
I am quite interested in what looks like an old A3 format HP Plotter...
--- End quote ---
Speaking of which, there used to be a company making HP-compatible plotters and selling them by the boat load. Had one to plot films for making PCBs.
I can't for the life of me remember the name of this company. Any help?
--- End quote ---
CalComp, Roland, Summa?
--- End quote ---
After another long search on Google and Ebay... Sekonic.
--- End quote ---
Must be a local something, for now it's completely unknown to me.
m k:
--- Quote from: mnementh on July 03, 2022, 02:46:40 pm ---
--- Quote from: Robert763 on July 03, 2022, 04:22:44 am ---
--- Quote from: mnementh on July 03, 2022, 01:34:23 am ---WELCOME TO 5000!
...
I think this is probably a good point to call it a night. ;) mnem :-BROKE
--- End quote ---
Hi Dwagon, Did you see my posts
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4275517/#msg4275517
and
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg4275556/#msg4275556
Looks like same video scheme as the 892x series a Gondbes 8220 video converter would be my next stop.
--- End quote ---
Yup, sure did; and followed that rabbit-hole down to that LCD mod. Very tidy! :-+
Problem is that the models we have tech ref on... the ones we've been talking about... are all proper non-greyscale monochrome monitors. Also, this family of monitors are all "1000 line" resolution (IIRC, I read that they "use" ~960 lines), so not too sanguine aboot dropping down to 800x600 resolution. :-//
There's a CDM-7SX191 monitor on eBay right now for $80... I've been meaning to get into one of these Chinesium video scan converters as a diag tool for a while, so that might still happen... but I think that if I were going to fix this scope, I'd prolly bite the bullet and buy that monitor.
This of course is all dependent on how my dispute resolves out. ;) I wanted to spend a little time tinkering just to see if there were signs of life; I was hoping it might be easy to mod the CDM-7SF191 I have in that 54600A so it thinks it's a CDM-7SX191.
I may instead try remoting into it over the RS-232 instead... in which case I'll soon be hunting down that software you posted and firing up the old WinXP Toughbook. >:D
mnem
:blah:
--- End quote ---
More CRT types needed.
54600A Pixel_data and Marker_dots are already 32 levels internally, but only 2nd and 4th of Pixel_data are used externally.
So taking out all five is pretty simple but the situation should also be very clearly visible in the monitor.
Old Intensity reference pot can grant its pins.
54600A Pixel_data goes through U37 74LS194 and then HB goes to U30 74ALS08, FB does the same but first ORing Marker_dots in U31 74F32, so either will do a final FB.
All gates are used so extra chip must be added, no idea when the device is designed but 5 TTL monitor pins feels a bit too much.
nixiefreqq's neck board has 1 FET and 3 BJTs, I'd say that 5 TTL pins are not there.
Since 74S03 is the earlier model my guess is that later monitors became better and external data level reference was not needed anymore.
So comparing two datalines will tell how the situation is.
Testing with an extra *old* computer monitor should also be pretty easy, if one is available.
One gate chip is needed, old display modes were selected by swapping sync polarities.
Using only green as data is also fine.
Functional monitor is not needed if vertical line movement is possible, since its color value is different it should be very visible.
Maybe duplicating buttons of two side by side machines can do settings.
Resolution
255 V x 500 H 54600B
256 V x 500 H 54615B
54620-series
255 vertical by 1000 horizontal points (waveform area)
32 levels of gray scale
Is it really 1000 pixels?
Vertical is the same as before so monitor is probably also pretty same as before.
I tried to find some tube info but everything was too old.
So no real idea of physical resolution of those 7" mono tubes.
But it can be checked, just compare those old and new 546xx horizontal lines, 1000 res has half the pixel length.
If shorter pixel length is there then different CRT must be also present, if that is the key.
mnementh:
--- Quote from: mansaxel on July 03, 2022, 03:55:51 pm ---
--- Quote from: Vince on July 03, 2022, 02:47:01 pm ---
Looks very clean/professional indeed... but what machine did you use that had enough force to punch through that metal, smoothly, i a controlled manner ? Surely a flick of a hammer won't do it... do you have a press ? That would be to just as interesting to see as the resulting holes... because I sure am interested as well.... links/costs etc....
--- End quote ---
Search for "sheet metal punch" -- what you do is drill a pilot hole and then use a punch that is operated with a screw in it:
Like this set on the US bay
--- End quote ---
In case you didn't know, Vince... these are a common "Sparky" tool. They're used to put holes in a electric box that doesn't have one exactly where you need it.
That set is not going to sell anywhere nearly so cheaply... I've stalked it more than a few times, and it never goes for less than a C-note, usually more like $125-150 if all the dies are in good nick. The low-profile stepped drill is a nice add-on; it helps when working in tight confines of a populated box. :-+
mnem
:-/O
Vince:
--- Quote from: mnementh on July 03, 2022, 04:36:55 pm ---
--- Quote from: mansaxel on July 03, 2022, 03:55:51 pm ---
--- Quote from: Vince on July 03, 2022, 02:47:01 pm ---
Looks very clean/professional indeed... but what machine did you use that had enough force to punch through that metal, smoothly, i a controlled manner ? Surely a flick of a hammer won't do it... do you have a press ? That would be to just as interesting to see as the resulting holes... because I sure am interested as well.... links/costs etc....
--- End quote ---
Search for "sheet metal punch" -- what you do is drill a pilot hole and then use a punch that is operated with a screw in it:
Like this set on the US bay
--- End quote ---
In case you didn't know, Vince... these are a common "Sparky" tool. They're used to put holes in a electric box that doesn't have one exactly where you need it.
mnem
:-/O
--- End quote ---
No of course I didn't know, otherwise I would not have asked Terra ;)
Must be something with American Sparkies though ? I see they use metal boxes there, but here it's plastic so it's just easier to use a drill if you really have to make new holes...
Now I think or it, one big advantage of punches is that you can make any shape you want, not just round holes... so it opens up an entire new world of possibilities 8)
You could make a hole with a flat, to fit pots and keep them from spinning round and round, or anything... as long as someone somewhere sells the shape that you want...
Vince:
Stupid me, now I remember my old man has an old punching machine, something like that :
You just attach a long lever / bar to it and use your muscles and bing, you have a hole.
I wonder if he still has it... hope so, so I can inherit it !: :-DD
He keeps pressing me to know when my garage will be built so he can donate all of his tools to me to free the large ex-family house and move into a much smaller and more convenient (given his age) house...
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version