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Test Equipment Anonymous (TEA) group therapy thread

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med6753:

--- Quote from: Kosmic on June 09, 2018, 03:59:53 am ---
--- Quote from: mnementh on June 09, 2018, 03:33:19 am ---My guess is that the unit was used as a parts mule in an earlier life.  :P  Hopefully there aren't any other "undisclosed features" in your new baby.  :-DD

--- End quote ---

Luckily no, it's not missing anything else. And its almost working (fail 0 volt self test). I guess it wouldn't be fun if it was working perfectly  :)

--- End quote ---

Very nice and thanks for the pron shots. Look at all those reed relays in there. It must go clicky-clack when changing ranges.

Keep us informed of your progress. And welcome to the addiction. You're in good company.  :-+

ruffy91:
Why did you buy a second multimeter? With only one you did know the exact voltage, now you are never sure!

med6753:
Holy shit. Look at this. You think we are addicted? Think again. This guy has been collecting TV studio equipment since the 1960's. Apparently most of it via dumpster diving so a lot of it doesn't work. But impressive none the less. Aside from the cameras and mics you could consider those consoles "test equipment". And look at all the possible adjustments and "tweaks" for the RGB signal. I now have a better appreciation as to why the NTSC standard was nicknamed "Never Twice the Same Color".   

bitseeker:
Wow, cool! And so nicely organized, too. Looks like a museum of all kinds of broadcasting goodness.

SeanB:
Remember as well those early imager tubes only had a few hundred hour operational lifetime, were rather insensitive ( thus the need for 50kW of light and a 200 ton AC unit in each studio), plus also had to be warmed up for around 4 hours before they would stop drifting, and could be aligned and set up using a massive colour chart and test pattern, daily. They also would have long term drift as well as the components aged, and many were also very orientation sensitive.

The rest of the world learnt from the US adoption of the National Television Standards Committee system, mostly in how to improve the very obvious flaws inherent in the system, and how, with only a few years better design experience from the original standard, designed to be compatible with the most common original set designs so as to not make undue interference, and made a few changes that improved stability and colour rendition.

Most obvious was PAL and SECAM mostly removed the "Hue" control, as the colour was a lot more stable both over time and with distortion in the transmission chain. The most impressive improvement prior to the all digital channel was that the designers of the standards managed to fit, in the original 8MHz allocated bandwidth, both colour pictures, analogue stereo audio, digital information ( Teletext) and as well high quality digital stereo audio ( NICAM stereo, which was capable of near CD audio quality, sadly let down by the poor speakers in most sets, being the smallest and cheapest they could fit in the set that would produce sound) which was the final step.

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