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| Test Equipment Anonymous (TEA) group therapy thread |
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| Robert763:
--- Quote from: Cerebus on July 03, 2022, 10:49:14 pm --- --- Quote from: Vince on July 03, 2022, 04:46:45 pm ---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... --- End quote --- They used to be quite common - you could get punches for the classic potentiometer with flat, D connectors, IEC inlets, and so on. Last time I bought some sheet metal punches the ones for anything other than purely round and rectangular holes seemed to have disappeared off the lists of the moderately priced manufacturers and I didn't look at the extortionately priced ones. --- End quote --- Made obsolete in industry by laser cutting and CNC routing. I've bought a 2mm laser cut panel with D shaped holes for less than a blank panel by the equipment case OEM |
| Cubdriver:
The replacement lamps for the NLS voltmeter display arrived earlier in the week, and I got a chance tonight to get it back onto the bench to go through the display again. I started by cleaning up the grounding springs using Deoxit, Scotchbrite and a small flat file, then after replacing the two known bad lamps put the display back into the meter with it in standby and manually stepped the relays through each position. I pulled it out each time it landed on a non-lit digit and replaced each bad lamp in turn, verifying that they were then lighting. In addition to the two I initially knew were bad, another four of them had to be replaced. Grounding spring: After cleaning: The meter now appears to be working pretty well - it measures, but is off by a few tenths to the Fluke 8120A I was comparing it to. Given that it uses a sixty year old zener reference in an ovenized can, lived in a basement for decades and hadn't been in operation in something like 30 years, I'd say it's in pretty good nick. New video with all digits operational: -Pat |
| Atomillo:
--- Quote from: Cubdriver on July 03, 2022, 10:37:11 pm ---Upper right… -Pat --- End quote --- That HP noise generators seems quite interesting. I think it uses the same design technique of chaining shift registers that is explored in the Noise Sources part of the AoE. If you do a teardown let us know! |
| Specmaster:
Geez, I take a day out (Sunday) to attend an air show and when I get back I find you guys have generated 5 whole pages of input to wade through :o. Air show was OK but could have been better, the best part of an hour just to gain entrance to the show ground caused by bad event planning :palm: Flying started at 14:00, so we had 5 hours to kill before the display and all the time the sun was shining nicely. Just after the show started, it became very overcast with black storm clouds photography became a waste of time, then it started to rain, so we went and sat in the car and watched the Grand Prix on the car's inbuilt TV. The Grand prix was just 30 mile west of our location, and they had a beautiful but drama filled day. :popcorn: |
| Vince:
--- Quote from: AVGresponding on July 04, 2022, 05:25:47 am --- --- Quote from: Vince on July 03, 2022, 10:44:45 pm ---I prefer upper LEFT if you don't mind, for it's got Nixie tubes in it ! >:D A " Signature Analyzer " wow that sounds fancy high tech and mysterious all at the same time.... do you hook up a camera to it and it reads a hand written signature and tells you if it's been forged or is legit ? Pretty high-tech for the day indeed ! :-DD OK OK... I will go download the user manual to see what it does ... :-// The HP noise generator at the bottom looks pretty nice, it deserves some cleaning for sure, please ! :-DD --- End quote --- Yes but the upper right unit matches the page number, rather the point... --- End quote --- Oh ! So we are back into this game again ? I thought it was history ? :-// When I joined TEA 15 months ago it was the 3000's and people were posted HP stuff every day, then came 4000 and a consensus was made that it was time to give upo on that game since very few people wanted to be flooded with CMOS chip pictures every single day.... so we it's now back again... hmmmm...... OK, I take note, I can play too.... >:D |
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