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Siglent SDG1032 as bad as rigol DG812?

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nctnico:

--- Quote from: temperance on May 18, 2024, 05:10:58 pm ---I just tried to reproduce the problem captured by eTobey but the sig gen. is a SDG2042. It does a clean shut down every time. The only artifacts one can see are caused by common mode currents. But they look different. (There is nothing connected except an oscilloscope short to GND).

So maybe I'm wrong.

--- End quote ---
Your screendump looks like what I'd expect where it comes to connecting / disconnecting mains. Also keep in mind that your SDG2042 is a totally different instrument and there might be different hardware versions as well.

eTobey:

--- Quote from: temperance on May 18, 2024, 05:10:58 pm ---I just tried to reproduce the problem captured by eTobey but the sig gen. is a SDG2042. It does a clean shut down every time. The only artifacts one can see are caused by common mode currents. But they look different. (There is nothing connected except an oscilloscope short to GND).

So maybe I'm wrong.


--- Quote ---I will do this, but only if you tell me, what you expect to see/happen.
--- End quote ---

Something like this

--- End quote ---

Do you expect this to happen when turning it off and turning it on?

eTobey:

--- Quote from: rf-loop on May 18, 2024, 05:45:42 pm ---
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.

--- End quote ---
Its not really random. Just set up a 99% duty square and you should get it quite easy. I had it the first time just now.
 
I got the probe now directly inserterted into the BNC, and it looks pretty much the same. See picture.

eTobey:

--- Quote from: temperance on May 18, 2024, 05:57:52 pm ---I'm able to catch this when the sig gen is starting. That's when some relays are switching just after boot.

As soon as you attach even the smallest load onto the output, nothing of this can be seen at the output. Nothing abnormal.


Edit: this is an SGD2042

--- End quote ---
I would not care about a one time noise burst of about 80mV ;-)

Mortymore:

--- Quote from: rf-loop on May 18, 2024, 05:45:42 pm ---...

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 ---

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.

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