The Origins of Delayed Timings on Oscilloscopes - Workbench Wednesdays

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Almost everyone uses a digital oscilloscope’s zoom features. However, did you know that 40-year-old analog oscilloscopes can do something similar? Delayed time bases on analog scopes sweep twice so that the user can see a slow and fast sweep. In this video, see where “zoom” came from and how engineers accomplished the same measurement back in the day: bit.ly/3mODDj6
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24 июл 2024

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Комментарии : 19

@bobweiss8682 2 года назад

The Tek 7834 was a storage version of your 7704. It used a special storage CRT that could capture single sweeps and hold them on screen for analysis.

@AmRadPodcast 2 года назад

Back in the day they really put time and effort into designing hardware for ease of access and serviceability. I can't bring myself to toss out my old gear for that reason. Great video and nice scope!

@jamieostrowski4447 Год назад

Delayed timebases were first introduced in 1954 on the Tektronix 535. Long time ago!

@herzogsbuick 2 года назад

fantastic walk through, and a beautiful old scope!

@TimKeller_geekboy1011 2 года назад

If only my analog scope did not have a broken B/DlY'D/Trigger knob...then I might actually be able to use this feature 🤔 Awesome video as always!

@radiohirsch 2 года назад

If demonstrated with a dual timebase like the 7B92A the zoom feature is even more intuitive. Learned analog Tektronix oscilloscopes before using digital ones for work and I am sometimes frustrated how hard it is to set up certain signals with some digital scopes that were knobs are minimalistic and menus are deep

@Bob-tu9jq 2 года назад

excellent

@MAYERMAKES 2 года назад

I need to crack open my analog scope... Maybe it also just has a bad resistor keeping it from working....

@mnoxman 2 года назад

You can also get a 7B92A and get that in one time base. You should search for a 7854 which will get you very close to a modern digital scope. The extra keyboard is not really needed esp if you use GPIB.

@jenniferwhitewolf3784 Год назад

My 7834 does 400MHz single shot that stays around for viewing if you want.. its a storage scope. My 7104 does 1 GHz and with microchannel image intensification also allows viewing of single shot events.. My R7844 is a 400MHz true dual beam. All these easily do things my 200MHz, 2GS DSO can't even dream of.

@qwaqwa1960 2 года назад

Gorgeous 7704...

@TheBic4 2 года назад

great job guys

@kstxevolution9642 2 года назад

is delayed timebase the same thing as trigger holdoff?

@bald_engineer 2 года назад

Short answer, No. Longer, full answer here: www.element14.com/community/docs/DOC-96903/l/workbench-wednesdays-43-the-origins-of-delayed-timings-on-oscilloscopes#comment-284505

@qwaqwa1960 2 года назад

Since the 1960s! :-)

@NiHaoMike64 2 года назад

Didn't some modular Tektronix boob tube scopes have a memory feature?

@raymonddompfrank1789 2 года назад

Sure, both modular and non-portable models. A few examples: 7613, 7623, 7633, 7834, 7934, 464, 466. These all have storage ("memory") on the CRT screen itself. Some had pretty fast single-shot storage. The 7854 analog 'scope had digital memory and could even be programmed with its own separate keyboard. A plugin (7D20) existed for the modular 'scopes, making the analog 'scope a digital one by using the 'scope as a monitor for a complete digital acquisition unit (70 MHz BW). In the low-cost 5000-series plugin 'scopes, analog and digital storage modules existed as well.

@jamieostrowski4447 Год назад

Boob tube scopes...the 500 series, yes. The first one that had delayed timebase was the 535 introduced in 1954. There was also a storage scope - the 549 - also a tube scope from (I think) the 50's although maybe early 60's. The 564 was also a storage scope that was introduced in around the early 60's.

@BryanTorok Год назад

The other interesting thing is that the glitch as displayed on the analog scope had nice square edges. Now, as frequency goes up and pushes the rise time capacity of the scope, you will lose the sharply defined corners. BUT the digital scope had a squiggly shaped waveform, nothing like a square shaped pulse.