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Siglent SDS-1202X-e waveform issues

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JiaRen:
Yes, its all grounded, I never use ungrounded power cables and our mains ground are also fine. I even checked the continuity of the power cable, but it is fine, and the unit's ground to the IEC ground prong, it is totally fine aswell.

rf-loop:

--- Quote from: JiaRen on December 04, 2022, 03:48:43 pm ---Yes, its all grounded, I never use ungrounded power cables and our mains ground are also fine. I even checked the continuity of the power cable, but it is fine, and the unit's ground to the IEC ground prong, it is totally fine aswell.

--- End quote ---

But your test chisel show light. If PE is ok it really do not.
Somewhere PE is broken, inside scope, inside mains connector or somewhere. (hard to believe your room have some extreme RF field)
This kind of test pen/chisel is very unreliable in many ways.
I think in your country there is Plug type G. So you can not turn it 180 degree and look if test pen  light turns off.

Do you have multimeter.

If you have,  check oscilloscope BNC etc GND have 0 ohm to plug PE connector.

Then in AC voltage range measure voltage between wall socket  Right and Left connector (usually L is connected to Right and N is connected to left in socket in thgis kind of socket you have there). You must see normal mains voltage.
Then measure voltage between socket Right connector to PE. It must display same voltage. Then Left connector to PE connector, It have usually very low near zero voltage or just zero (depending how it is connected and load in other parts in house power lines what can rise N wire voltage level relative to PE).


Then PE connector voltage to Real Ground and Earth (example metal water pipe etc) need be very near zero.

I have seen so many times wrong installations and then much more eaxample broken PE (wire broken, loose contact and so on... all what can imagine and bit more. I have tens of years experience. )

Are there any signs than someone have open this scope before. Broken seal, or other signs or some marks on the screws. If someone have opened it, it is not first time someone forget PE wire connecting. (with multimeter or what ever method you can test there is direct contact from scope BNC GND to power terminal PE pin. It must be 0 ohm.)

JiaRen:
I tested all of the above, Chassis ground to IEC ground prong and everything seems fine. Before I change the power cable, I did check the voltage out of the ground on the chassis terminal and BNC, it was like 52v AC out, referenced to one of the ground in one of my amplifier I’m working with. After changing it, went to 0.2v, all continuity on all grounds no issues so it is earthed. No, there is no sign of someone opened it, except I went ahead and open it up to check for loose ground or screws, nothing in there, no burn marks no anything.

It is Still bothering me why suddenly there is 52v AC out of the ground terminal. Also there was no DC out so is it psu leaking into ground?[attachimg=1]

JiaRen:
Contacted siglent and they told me to send them images and videos relating to it, and they finalised that the main board is having issues and best solution is to get a new board from them. Also my scope is the early model, so it is the BA serial number ones.

tautech:

--- Quote from: JiaRen on December 05, 2022, 01:09:14 pm ---Contacted siglent and they told me to send them images and videos relating to it, and they finalised that the main board is having issues and best solution is to get a new board from them. Also my scope is the early model, so it is the BA serial number ones.

--- End quote ---
HQ has studied this thread too and they offer the same advice.
Good luck with the repair.

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