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recent experience shopping for hobby scope in today's market. tek, rigol, ...
David Hess:
--- Quote from: argile_tile on February 23, 2023, 04:50:07 pm ---. $563 Tektronix TBS1000C
- 20kpts (each channel) (40?)
how limiting idk: 20k is ALLOT for "one capture". read about that before.
if (tek, keysight, silgent) is limited by kpt for of (24hr capture of infrequent capture)
is another matter entirely
--- End quote ---
The Tektronix TBS1000C supports delayed triggering so the 20k sample points can be moved to a later part of the waveform after the trigger. This is the equivalent of delayed sweep in an older oscilloscope which effectively allows horizontal magnification of the waveform.
--- Quote ---? tek claims real-time sampling others don't say. is defined by tek as
"records all samples at once, stores in 'memory', then repeats"
(does that mean ADC is 20kpt?) other brands say nothing about it
tek oversampling supported also
--- End quote ---
"Real time" in this case means that all channels sample at their maximum rate no matter how many channels are active. Turning on more channels does not lower the sample rate of each channel.
2N3055:
--- Quote from: David Hess on February 26, 2023, 03:57:55 am ---
--- Quote from: argile_tile on February 23, 2023, 04:50:07 pm ---. $563 Tektronix TBS1000C
- 20kpts (each channel) (40?)
how limiting idk: 20k is ALLOT for "one capture". read about that before.
if (tek, keysight, silgent) is limited by kpt for of (24hr capture of infrequent capture)
is another matter entirely
--- End quote ---
The Tektronix TBS1000C supports delayed triggering so the 20k sample points can be moved to a later part of the waveform after the trigger. This is the equivalent of delayed sweep in an older oscilloscope which effectively allows horizontal magnification of the waveform.
--- Quote ---? tek claims real-time sampling others don't say. is defined by tek as
"records all samples at once, stores in 'memory', then repeats"
(does that mean ADC is 20kpt?) other brands say nothing about it
tek oversampling supported also
--- End quote ---
"Real time" in this case means that all channels sample at their maximum rate no matter how many channels are active. Turning on more channels does not lower the sample rate of each channel.
--- End quote ---
Real time simply mean this is not repetitive sampling oscilloscope (i.e. it samples at real 2 GS/s rate, not equvalent rate).
And 20kpoint is very little or enough memory, depending on what you do. If you spend life using scope at short timebases looking at repetitive signals at higher frequencies it might be enough. Large memory helps with aliasing problems, it helps keep that sampling rate high while at longer timebase...
nctnico:
For as long as a scope has peak detect mode, aliasing is not a problem at all. With short memory, you can't zoom in though to see if a small blib that pops up suddenly is something interesting or not.
David Hess:
--- Quote from: 2N3055 on February 26, 2023, 08:44:35 am ---
--- Quote from: David Hess on February 26, 2023, 03:57:55 am ---"Real time" in this case means that all channels sample at their maximum rate no matter how many channels are active. Turning on more channels does not lower the sample rate of each channel.
--- End quote ---
Real time simply mean this is not repetitive sampling oscilloscope (i.e. it samples at real 2 GS/s rate, not equvalent rate).
--- End quote ---
Tektronix does not use "Real Time" to mean that at all. Many of their previous "real time" DSOs also supported equivalent time sampling, including their earliest "real time' DSOs like the 2400 series. It only means that sample rate (and record length) is independent of the number of channels.
--- Quote ---And 20kpoint is very little or enough memory, depending on what you do. If you spend life using scope at short timebases looking at repetitive signals at higher frequencies it might be enough. Large memory helps with aliasing problems, it helps keep that sampling rate high while at longer timebase...
--- End quote ---
My point is that the delayed triggering capability makes up for the short record length in most cases, and it has nothing to do with repetitive signals; it works fine in single sweep acquisition mode. The TBS1000C can view portions of a waveform at high sample rates at any point after the trigger, where DSOs without this feature are limited by their record length.
zrq:
--- Quote from: David Hess on February 26, 2023, 01:53:30 pm ---
--- Quote ---And 20kpoint is very little or enough memory, depending on what you do. If you spend life using scope at short timebases looking at repetitive signals at higher frequencies it might be enough. Large memory helps with aliasing problems, it helps keep that sampling rate high while at longer timebase...
--- End quote ---
My point is that the delayed triggering capability makes up for the short record length in most cases, and it has nothing to do with repetitive signals; it works fine in single sweep acquisition mode. The TBS1000C can view portions of a waveform at high sample rates at any point after the trigger, where DSOs without this feature are limited by their record length.
--- End quote ---
You are right if the interesting short time feature is appearing repetitively at a predictable interval after some triggerable event. Which is arguably not so common.
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