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Siglent SDG1032 as bad as rigol DG812?
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rf-loop:

--- Quote from: rf-loop on May 18, 2024, 05:45:42 pm ---
--- Quote from: Mortymore on May 18, 2024, 02:57:04 pm ---Are you referring to some overshoot when the generator is turned OFF with the outputs still on, right?

It seems that it could happen depending were the square wave is caught at power off. Sometimes it doesn't happen, sometimes overshoots up, other down.



Anyway, I suppose that the ON/OFF output buttons serves a purpose, and that doesn't happen when they're used

EDIT: It would be so much easier for everybody if at least you had the trouble to proper stand your case with adequate description and images. After all you have the devices.

--- End quote ---

I want look this bit more when I have time for it.
If it is very "random" after shut off with power line, I want still catch it (these upper level "peaks" in end.)

The signal outputs should be cut off before the collapse of the operating voltages progresses to a level where the device starts to run out of control.


How was signals connected. (in your image looks it looks like well connceted with external 50 ohm and coaxial but still I like facts and not my quess.)
What is your SDG Hardware version.

--- End quote ---


--- Quote from: Mortymore on May 18, 2024, 07:29:08 pm ---
Hi rf-loop

The AWG is an SDG1032X (upgraded to SDG1062X), SW version: 1.01.01.33R8 ; HW version: 02-01-00-24-00
The cables used are a very old pair of RG-58/CU with 1m aprox.
Only one feedthrough 50Ohm terminator was used at CH1 of the scope, were the square wave was applied.

The over and undershoot captured in previous images, doesn't always happen. I could have posted a similar picture as yours, but it would have been redundant.
I assume that the "spikes" seems to be controlled somehow, because there are flattops, when a differential voltage goes over roughly 1.5V.

If any further info or diligence from me is needed, please inform.

--- End quote ---



I have now been testing this phenomenon for several hours repeatedly, last evening and continuing today. I haven't counted the repetition times, but I estimate at least more than 200. I also did experiments with different frequencies, amplitudes and offsets. I have never seen anything similar that appears in your picture right when channel 1 ends. Those nearly 2V spikes.

Each time I have seen a quite nice landing.

My HW version is the same as yours.
I run FW version .33R1 because I have modulation and ramp etc. modifications that should be done again if I update. There are more important things to do, so I'll update sometime later if necessary. I also can't really believe that this would affect exactly this behavior when the operating voltages start to drop when the power goes OFF.


It is actually impossible to completely prove that something does not exist.

Besides, even though the HW version is the same, there are still differences, in fact in every component. (for example, if one were to examine very carefully at which point the relays related to the output stage of the signal change state after PowerOFF when all power supplies voltages start fall, time differences will certainly be found.)
eTobey:
I got:
FW: 1.01.01.33R8
HW: 03-00-00-24-00

High level 3.3V, Low level 0V

And almost 3V of "limit overshoot".
And a mean of 4.5V for 240us
rf-loop:
@Mortymore

Here just one random result during this PowOFF test.
Yes there are some small differences with different frequencies, different levels and offsets etc...

In this image full max voltages with HiZ loads. Ch1 1kHz, 20Vpp and Ch2 (scope Ch4) 10Vdc
(signals connected directly using 50ohm coaxials)

Least with my unit there can not find problem in output signals when hard PowOFF.
But naturally my predictable rest of lifetime is not enough for test every possible setup combinations even once per setup.  ;)


eTobey:

--- Quote from: rf-loop on May 19, 2024, 12:36:28 pm ---But naturally my predictable rest of lifetime is not enough for test every possible setup combinations even once per setup.  ;)

--- End quote ---

If you would choose  a 100mHz square, and a 99% duty, you are more likely to hit that high level right at the beginning of the rest of your life.

On that picture it looks like you hit that low level...  ::)
rf-loop:

--- Quote from: eTobey on May 19, 2024, 01:28:27 pm ---
--- Quote from: rf-loop on May 19, 2024, 12:36:28 pm ---But naturally my predictable rest of lifetime is not enough for test every possible setup combinations even once per setup.  ;)

--- End quote ---

If you would choose  a 100mHz square, and a 99% duty, you are more likely to hit that high level right at the beginning of the rest of your life.

On that picture it looks like you hit that low level...  ::)

--- End quote ---

That one magpie's nest type of signal connection that you recently brought up when you criticized the generator's frequency response. I will say one more and one last time. Most of the problems you'll encounter with oscilloscopes or generators are between them and the chair you sit. Next time I might say it less nicely.

Here is 100mHz and 99% Duty. And again hard PowOFF.
And yes, signal is 20Vpp and other is generator 10V DC out (also for trig)

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