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Tektronix 1-3 GHz touch screen color DSO back in 1989 !

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snoopy:

--- Quote from: Wuerstchenhund on August 28, 2017, 01:12:29 pm ---
Yes, for glitches that have periods of 10's of minutes or even hours, in which case sitting in front of an InstaVu screen would be equally silly because all it does is showing that there's a glitch, and that only if you happen to see it (sometimes glitches can even be small enough for them to remain unrecognized by the operator), and if you see it you then have to re-capture again in snail mode and hope your slow Tek scope will capture it with its now vastly extended blind time.

Also, in your rabid praise of InstaVu you completely ignore that even this mode has a blind time, and is likely to miss the occurrence of a glitch. Which means that even if you spend half an hour looking at your signal in InstaVu without seeing a glitch doesn't mean there is none, it just means you can't say with certainty that there are glitches.

The only way to be sure are advanced triggers.


--- End quote ---

Yes it is blind for small amount of time but it all comes down to probabilities.  Even if a glitch has an average rate of one per hour you just set Instavu mode with infinite persistence so you are likely to capture the glitch in an hours time or there abouts without having to stare at the screen to wait for it. Whereas your traditional 1% acquisition time scope would take 100 hours on average at the very least to reproduce the glitch ! Also with Instavu mode switched on, measurement are still available as well so not everything is disabled. I think these scopes were way ahead of the competition at the time ;)

cheers

smaultre:
Hello guys, is it actual to buy nowdays HP 54120B with the 54124A, which could go up to 50Ghz?
Or Tek stuff like 11700 or 8000 series are better?
I would like to measure up 40-50GHz division.

tggzzz:

--- Quote from: Wuerstchenhund on August 20, 2017, 04:29:50 am ---And Philips had the PM3340 2GHz 10bit 50kSa/s sampling scope back in 1988:

--- End quote ---

Philips had the PM3400 1.7GHz "11/12 bit" sampling scope back in 1971. It could resolve ~200µV in 3V, hence "11/12 bit" :)

IIRC there are three transistors with fT exceeding 500MHz; the rest are BC107 class with an fT around 200MHz.

https://www.radiomuseum.org/r/philips_sampling_oscilloscope_pm3400.html
https://www.eevblog.com/forum/testgear/tektronix-scope-with-sampling-plug-in/msg468702/#msg468702


--- Quote ---
--- Quote ---Anyone still using one of these old war horses ?
--- End quote ---

I doubt it. Sampling scopes are useful only in very few situations.

--- End quote ---

Some of them are prized by their owners, e.g. for TDR assessments of PCB tracks+components, or examining the last 0.1% of an amplifier's risetime.

General purpose? No. But that's not necessarily the point.

David Hess:

--- Quote from: tggzzz on June 16, 2024, 08:28:49 am ---
--- Quote ---
--- Quote ---Anyone still using one of these old war horses ?
--- End quote ---

I doubt it. Sampling scopes are useful only in very few situations.

--- End quote ---

Some of them are prized by their owners, e.g. for TDR assessments of PCB tracks+components, or examining the last 0.1% of an amplifier's risetime.

General purpose? No. But that's not necessarily the point.
--- End quote ---

Sampling oscilloscope are almost uniquely useful for doing transient response calibration.

The input stage of a sampling oscilloscope is immune to overload, so they are also very good for making settling time measurements at high sensitivities that other oscilloscopes simply cannot do.

tggzzz:

--- Quote from: David Hess on June 16, 2024, 02:57:51 pm ---
--- Quote from: tggzzz on June 16, 2024, 08:28:49 am ---
--- Quote ---
--- Quote ---Anyone still using one of these old war horses ?
--- End quote ---

I doubt it. Sampling scopes are useful only in very few situations.

--- End quote ---

Some of them are prized by their owners, e.g. for TDR assessments of PCB tracks+components, or examining the last 0.1% of an amplifier's risetime.

General purpose? No. But that's not necessarily the point.
--- End quote ---

Sampling oscilloscope are almost uniquely useful for doing transient response calibration.

The input stage of a sampling oscilloscope is immune to overload, so they are also very good for making settling time measurements at high sensitivities that other oscilloscopes simply cannot do.

--- End quote ---

Just so.

Unfortunately that doesn't stop some salesmen claiming otherwise.
https://www.eevblog.com/forum/testgear/choosing-between-entry-level-12-bit-dsos/msg5433389/#msg5433389

But advances in ADC and front ends are continuing to eroding that advantage.

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