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Test Equipment Anonymous (TEA) group therapy thread

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mnementh:

--- Quote from: tggzzz on May 15, 2018, 09:48:54 am ---
--- Quote from: Specmaster on May 15, 2018, 08:16:50 am ---Heads everyone, TTi TGP110's are back in stock again and they have 18 in cream and 19 in grey.

--- End quote ---

I'm not really sure why I would want a pulse generator; any of the pulses I would want would be more conveniently generated by a pattern generator.

Having said that, I recently picked a Tek 115 up for £5, and that does one thing a pattern generator won't: have (independently) variable rise and fall times. Mind you, neither does that TTI.

The Tek 115 is remarkably versatile, being able to generate double pulse and, with an external signal triggered bursts. The TTI doesn't look like it does that either.

Example, with equal rise/fall times:


Ob porn: the front panel showing rise and fall time controls, and one interior shot showing old-school wiring looks and, if you look closely on the left, 863pF, 908pF and 9.85nF capacitors.

--- End quote ---
Oh, that is quite delicious... has much of the same "precision analog built for the space program" feel as my old 454... also would be a good module (if collected together with a dozen of its brothers) for analog computing or synthesizer stacks.


mnem
That's right Ted, I'm thinking of you.

bd139:
@Cerebus: Thanks for taking the time to document that properly. Very neat solution to the problem.

So fundamentally it's sourcing/sinking fixed current from the 1n cap. Similar to function generator ramp generators.

mnementh:

--- Quote from: VK5RC on May 15, 2018, 12:34:44 pm ---That's not tautech - that's me - before I went bald (on the top of my head only)!!

I got given a non-working Tek 7603 - but no plug-ins so I bought 7B50A 7B53A 7A16A 7A18, some capacitor adaptor plates - so far the caps test OK on in circuit ESR.
Also bought one of Daves little pocket DMM Sanwa PM300- it comes in a really funky little case.

--- End quote ---

Whuf! That PM300 is a pricey little devil. What makes it supposedly better than the little Radidio Shack meters I used to buy for $20?


mnem
Urrrk.

Cerebus:

--- Quote from: bd139 on May 15, 2018, 01:34:11 pm ---@Cerebus: Thanks for taking the time to document that properly. Very neat solution to the problem.

So fundamentally it's sourcing/sinking fixed current from the 1n cap. Similar to function generator ramp generators.

--- End quote ---

I think elegant is the word; as in mathematics and programming, elegant solutions are particularly satisfying. On Tim's Tek 115 there's a bunch of capacitors switched for the rise time knob, and the rise time and fall time multiplier knobs are just pots in the emitters of single transistor constant current sources.

tggzzz:

--- Quote from: mnementh on May 15, 2018, 01:14:09 pm ---
--- Quote from: tggzzz on May 15, 2018, 07:46:54 am ---
--- Quote from: bitseeker on May 15, 2018, 04:52:12 am ---They're congregating...or perhaps colluding.

--- End quote ---

Excellent collective noun: "a collusion of test equipment"

--- End quote ---

When I was young, and my electronics bits and pieces were scattered from hell to breakfast all over the house... my mother used to tell me they were plotting to overthrow her tyranny. She would point out the test gear I happened to be using at the time (usually assembled in stacks in a circular fashion on the floor behind and table in front of me) which was always old and crunky and scarred as it was all third or fourth-hand, and say they were holding court, with me the accused in the middle.

*Sigh*

Remember when we just did it for the fun of learning?!?
*Miss you mom*

--- End quote ---

*aaaaahhhhh*. Yes, it seems like yesterday. In fact it was yesterday (as well) :)

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