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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
Back on topic, some quick Saturday afternoon TEA actually doing something fun. Got a scope with an FFT so decided to see if I could build a pure sine wave generator to test it. Plus I haven't built a proper sine wave oscillator since university. Quick Wein bridge with an HP style bulb for feedback did the job. Had to frig around with the feedback resistors to stop it bashing the rails.

Lash up. Used a breadboard. Sue me. At least it's a 3M one :D



Not bad. What harmonics?



This sort of stuff is also incidentally where the HP 6237B I bought recently would fit in nicely. Rather than two bloody great big PL series supplies and a tentacle monster, three nice neat wires, one voltage control and one power switch. Plus an HP logo.



Slightly want an old HP dynamic signal analyser now.

Specmaster:
Nice work, I must get my breadboards out and try something one day, not today though, been polishing up the old 1740A ready for disposal.

I love those TTi power units, surely they are better then the old HP ones? Granted they do take up more room then the HP but TTi also do double and triple supply versions, perhaps one day I'll get something like that myself.

Still not quite made up my mind on that other digital scope, its an early HP54502A and while its 400MHz, this I believe is in digital mode, real time its only 100Mhz.

Edit:

Just noticed that this 3390B also has a FFT mode, sweet. Heres a screen showing a 50Hz and the FFT trace for that.


bd139:
They’re better than the old HP ones as far as the setting goes. The actual output on the HPs is slightly better with respect to noise and transient response. The HP supplies are also a lot smaller and easier to fix. Both are silent which is a big win in a world of whining bastard equipment.

One really good feature of the supplies with analogue current readout is they have damping built in. Even on the TTi PL supplies the current damping is crap.

I’d stay away from the 545xx series of scopes myself. I used one extensively many years ago and it was a pig. The 546xx ones are much better. If you’re going to spend, wait out for a later one with an Agilent logo on it.

That’s pretty damn good if that has an FFT built in!

Specmaster:

--- Quote from: bd139 on June 16, 2018, 03:58:58 pm ---They’re better than the old HP ones as far as the setting goes. The actual output on the HPs is slightly better with respect to noise and transient response. The HP supplies are also a lot smaller and easier to fix. Both are silent which is a big win in a world of whining bastard equipment.

One really good feature of the supplies with analogue current readout is they have damping built in. Even on the TTi PL supplies the current damping is crap.

I’d stay away from the 545xx series of scopes myself. I used one extensively many years ago and it was a pig. The 546xx ones are much better. If you’re going to spend, wait out for a later one with an Agilent logo on it.

That’s pretty damn good if that has an FFT built in!

--- End quote ---
That's what I thought seeing as it's 10 years old [emoji106]

Funny your message arrived just as I made my mind up to wait for further lab clearance auctions and see if I can bag either a faster one or a 4 channel one. I'm getting to like having to do nothing to my TEA purchases other than tearing them down for photos and cleaning. It's even better than buying new as I don't have to pay that massive premium called depreciation 🤣



From mobile device so predictive text might have struck again [emoji83]

bd139:
Yeah it’s nice not to have broken shit on your hands sometimes. Hence why I actually got to build something today  :-DD

If I could justify it I’d kit myself out with a new Keysight scope, power supply and DDS. Better get me a lottery ticket :D

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