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| Most (Digital-)Scopes are freezing while vertical adjustement... |
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| nctnico:
--- Quote from: Martin72 on November 14, 2022, 11:09:54 pm ---Calculation of extremas was your loving task in math, or ? ;D Knowing the appx amplitude and the time is enough for me, because we´re not expecting surprising signals of the DUT in the testfield.. 8) --- End quote --- Appearantly you are never involved in electronics development work. That is a world that can be full of surprises. Think of a circuit oscillating unexpectedly. |
| bdunham7:
--- Quote from: Martin72 on November 14, 2022, 10:15:55 pm ---So what do you think, when scope´s freezes while adjusting vertical line, is it a bug most scopes then got ? --- End quote --- No, IMO this is called 'not understanding what you are seeing'. I'm not going to drag every scope I have onto the bench, so I'll just look at my SDS2354X+. If you have a low amplitude signal and you stop the scope and then increase the sensitivity a few clicks, you'll see an expanded trace with lines in it due to the digital expansion. Now if you set up the scope so that you have a fairly low refresh rate--whether due to low sweep rate, low pulse repetition rate or long holdoff time--you may briefly see the same thing as you expand the currently visible trace. Furthermore, if you have persistence enabled, the scope (properly IMO) clears most of the persistence display and just shows you the most recent trace, expanded as appropriate, until it retriggers again. If you do this with a varying signal--say AM modulated--then it may take some time to rebuild the persistence display. These things might be misconstrued as the scope 'stopping' while the vertical knob is being moved. I don't see any significant interruption of retriggering when adjusting the vertical and if it is there, it is a fraction of the normal retrigger time. |
| noisyee:
--- Quote from: Martin72 on November 14, 2022, 10:15:55 pm --- So what do you think, when scope´s freezes while adjusting vertical line, is it a bug most scopes then got ? Keysight are mentioned not to do this, also GWInstek - Not all models. --- End quote --- Keysight does, even their new MXR. But much more responsive than its competitors - Keysight is always superb at. I think all digital scopes will display history waveform rather than acquire in real time when adjusting. It's a matter of current time base setting, memory depth and the instruments' processing power. Almost all scopes will freeze at large time base or large memory depth, in which situation it's too hard to process in real time. Some scopes choose to reacquire until adjusting is done, no matter what current settings are, so they "freeze". Maybe it's a limitation of the hardware, they can't refresh in time so it will make the scope slack if reacquiring-while-adjusting, or it's just a software issue to be optimize, who knows. Some scopes, like Keysight, choose to periodic reacquire while adjusting at smaller time base or memory depth, so the displayed waveform flickers rather than freezes. Keysight scopes behave more like a analog one which is always welcomed. |
| Martin72:
Hi, Thankyou, I already knew this more or less. "Goal" of the Thread is to explain that this behaviour isn't a bug in the scope's software, like someone might think. |
| JPortici:
As i wrote in another thread "like the "zoom out quirk" it's really incredible what people fixate on. It's just another non issue. "Doesn't work as i expect to (without ever reading the manual)" is different than "OMG ITS A BUG" please dave don't do a video on this as well, the last few of this kind were very cringe |
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