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Most (Digital-)Scopes are freezing while vertical adjustement...

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nctnico:

--- Quote from: 2N3055 on November 15, 2022, 05:17:17 pm ---
--- Quote from: nctnico on November 15, 2022, 04:30:08 pm ---
--- Quote from: bdunham7 on November 15, 2022, 04:11:55 pm ---
--- Quote from: nctnico on November 15, 2022, 03:53:04 pm ---No. Acquisition can be cancelled/halted/stopped at any point. There is no reason to wait for a full acquisition when a parameter changes.

--- End quote ---

Of course the acquisition can be stopped and restarted, but it has to complete the subsequent acquisition process before the data can be processed and displayed, no?

--- End quote ---
No. Acquisition is interrupted and whatever is in the buffer gets displayed. That is how R&S works.

--- End quote ---
So like Joe said, you put scope to 1s/div, and as soon as you move trace with a knob what happens:

1:  Immediately erases the screen and starts from left side again with changed vertical position.
or
2: Immediately stops the horizontal trace scan  and lets you move what was on the screen up and down. Once you stop, it resets and starts from the left.
or
3: It lets you move trace up and down while simultaneously keep scanning to the right like nothing is happening (except vertical movement, of course)

Thank you.

--- End quote ---
R&S does option 1. But I've seen all 3 options on scopes I've owned / used. IMHO option 3 is the 'worst' method of all because it allows you to draw fantasy signals.

bdunham7:

--- Quote from: JPortici on November 15, 2022, 05:36:16 pm ---FWIW, Tek Does (3) in the 2.5kS scopes, But trigger is disabled

--- End quote ---

Yes, but those scan from left to right at slow sweep rates in normal mode with Auto trigger, allowing you to draw like an Etch-a-Sketch with the V-pos knob.  Everything modern I have does the whole acquisition and then displays that, or else it uses 'roll' mode which goes from right to left.  Siglent clears and starts over in roll mode with any vertical adjustment, which actually sems sub-optimal.  Are others different?

JPortici:

--- Quote from: bdunham7 on November 15, 2022, 05:56:37 pm ---which actually sems sub-optimal.

--- End quote ---

Actually i don't care, i can work around all of them. I just need to know which way the scope performs.

Caliaxy:

--- Quote from: nctnico on November 15, 2022, 05:46:52 pm ---
--- Quote from: 2N3055 on November 15, 2022, 05:17:17 pm ---
--- Quote from: nctnico on November 15, 2022, 04:30:08 pm ---
--- Quote from: bdunham7 on November 15, 2022, 04:11:55 pm ---Of course the acquisition can be stopped and restarted, but it has to complete the subsequent acquisition process before the data can be processed and displayed, no?

--- End quote ---
No. Acquisition is interrupted and whatever is in the buffer gets displayed. That is how R&S works.

--- End quote ---
So like Joe said, you put scope to 1s/div, and as soon as you move trace with a knob what happens:

1:  Immediately erases the screen and starts from left side again with changed vertical position.
or
2: Immediately stops the horizontal trace scan  and lets you move what was on the screen up and down. Once you stop, it resets and starts from the left.
or
3: It lets you move trace up and down while simultaneously keep scanning to the right like nothing is happening (except vertical movement, of course)

Thank you.

--- End quote ---
R&S does option 1. But I've seen all 3 options on scopes I've owned / used. IMHO option 3 is the 'worst' method of all because it allows you to draw fantasy signals.

--- End quote ---

R&S RTC1002 (ex-Hameg) does #1 too, but keeps trying to restart the acquisition much more frequently than any other scope I've tried. It keeps restarting plotting the trace from the left as you rotate the vertical position encoder slowly but continuously (and it erases it as soon as it figures you are still rotating the knob). At timebases faster than 5ms/div, it *seems*  that it does #3 (or maybe it really does it, hard to tell).

Also, RTC1002 has a vertical "Scrolling" control which lets you move the whole screen content (traces and grid) up and down to explore what's above or below of what's displayed (like a long webpage that doesn't fit on your computer screen). While doing so, it does #3 (at any timebase).

markone:
I honestly think that the instrument cost factor must be taken in consideration in this kind of debate, otherwise the whole thing becomes pointless.

For instance, i spent the whole day using a customer's Rigol MSO5074, that almost freeze the whole screen update during trace vertical adjustment, but considering the cost paid (around 1000 euros, including PLA2216 digital probes kit) it was expected and tolerated but ... if it had been paid like 4-5K euros, well, there is no way to convince me that this level of "laggyness" could be acceptable.

I worked a lot with power electronics  (brushless motor control and induction heating), the last thing that is accepted in this sector is a DSO that freezes for a bunch of time during trace adjustments and considering that a 12bit DSO like new Rigol HDO series could be aimed to power electronics design lab, statemets like "no problem if DSO stops to update screen for a bunch of time" and / or "i do not give a s*** for analog emulation" make me laugh a lot.

if I bought a 5K euro scope like the HDO4804 to find out later the laggy behaviour shown in Dave's video, I would not be satisfied at all, especially in the belief that the employed HW can do much better.

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