Products > Test Equipment
Siglent SDG1032 as bad as rigol DG812?
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tautech:

--- Quote from: eTobey on May 20, 2024, 09:23:26 am ---
--- Quote from: rf-loop on May 20, 2024, 08:14:57 am ---Take a look example at when @eTobey is wondering about the frequency response (in other thread) and then there is a kind of kindergarten-level connection of the investigated signal...where actually everything is wrong and of course there is a bug or issue in the devices...of course. Here, even vocational school kids don't make magpie nests like that.Hee

Of course, the some dog's chin can now wonder why I didn't test the 6 V level, or 3.33V level, is there something I'm hiding. If it continues to happen, I say: Grow up.
I won't publish 300 more pictures because nothing else essential is shown in them.

--- End quote ---

Yet those "experts with a lot of experience" failed to figure this out and help this noob. Instead they trashed him again (hope that is the right translation). Yes, indeed it looks like a clown club!

300 more pictures? You could have just choosen one (the right one) of them to satisfy me, or proven the fact, but you failed.

--- End quote ---
You would do well to Default your scope and set up just as rf-loop has shown and test again....or be the unchallenged captain of your own clown club.

rf-loop has extensively tested these units since release in 2016 based on scope experience of 50+yrs.
Show some correct and detailed screenshots or zip it.
eTobey:

--- Quote from: tautech on May 20, 2024, 10:06:42 am ---
--- Quote from: eTobey on May 20, 2024, 09:23:26 am ---
--- Quote from: rf-loop on May 20, 2024, 08:14:57 am ---Take a look example at when @eTobey is wondering about the frequency response (in other thread) and then there is a kind of kindergarten-level connection of the investigated signal...where actually everything is wrong and of course there is a bug or issue in the devices...of course. Here, even vocational school kids don't make magpie nests like that.Hee

Of course, the some dog's chin can now wonder why I didn't test the 6 V level, or 3.33V level, is there something I'm hiding. If it continues to happen, I say: Grow up.
I won't publish 300 more pictures because nothing else essential is shown in them.

--- End quote ---

Yet those "experts with a lot of experience" failed to figure this out and help this noob. Instead they trashed him again (hope that is the right translation). Yes, indeed it looks like a clown club!

300 more pictures? You could have just choosen one (the right one) of them to satisfy me, or proven the fact, but you failed.

--- End quote ---
You would do well to Default your scope and set up just as rf-loop has shown and test again....or be the unchallenged captain of your own clown club.

rf-loop has extensively tested these units since release in 2016 based on scope experience of 50+yrs.
Show some correct and detailed screenshots or zip it.

--- End quote ---

If you can explain, how a 2-3V rise for about 100-150us can come from a tiny bit of "magpie nest", i will do this, otherwise i will just set sail...
2N3055:

--- Quote from: csuhi17 on May 20, 2024, 09:54:04 am ---I was a little confused, the lack of language skills is a disadvantage for me.

What is the end result, what causes this?

From previous conversations, I came to the conclusion that if my signal generator and oscilloscope do not have the same earth.
My micsig is operating on its own battery.
and
Not the method used by most of the other.
Siggen -> aligatorclip -> scopeProbe10x -> scope.
Then will not be an over -shot?

I tried it
Rigol dg912pro
Chinese BNC-BNC wire that was added to the FY6800, the entire connectors do not reach 50cm.
The internal wire has a DC resistance of 50mohm and the exterior is 28mohm.
Micsig to1104 1MOHM input impedance

If I understand it, the over -shot occurs when the AC230V disappears, breaks. when the outout is  active.

I simply pulled the Rigol USB-C cable during operation.


If this is a real event and can occur with any brand -independent signal generator, why is it a problem to discuss?
I think it is worthwhile to test their own, lest you accidentally catch a bad series and ruin their own project.

I am lucky enough to have a USB-C, so I don't have to buy a uninterrupted PSU.
I think.

--- End quote ---


That is exactly my point. If you connect instruments in in any number of (pathological)way, you can get any kind of weird artefacts when doing weird stuff.

You should not simply yank cables, or power to any piece of equipment during active testing.
Even if your electricity supply is cut (power out) there is no saying in which order will any of your pieces of equipment power down. There can be reverse currents flowing  too..
nctnico:

--- Quote from: eTobey on May 20, 2024, 09:35:03 am ---
--- Quote from: nctnico on May 20, 2024, 09:14:03 am ---Thanks for elaborating further on your testing. The conclusion has to be that there have to be differences between units then. Maybe Siglent decided to remove some capacitors or a capacitor with a different behaviour has been placed (*). 2 forum members have showed an effect your unit doesn't have.

* Do not assume that ordering the same part number gets you an identical capacitor every time! This sounds silly but I have experienced this myself.

--- End quote ---

I just noticed, that the "fun" happens in around 10ms, where as rf-loop has some action going on for 400ms!
It seems that his device has some much bigger caps somewhere. Or some relais are different.

--- End quote ---
True. That is something I observed as well in your and Mortymore's screendumps.
nctnico:

--- Quote from: csuhi17 on May 20, 2024, 09:54:04 am ---I was a little confused, the lack of language skills is a disadvantage for me.

What is the end result, what causes this?

From previous conversations, I came to the conclusion that if my signal generator and oscilloscope do not have the same earth.

--- End quote ---
They have the same earth. Or better put, the same reference as the grounds are connected by the 0V of the outputs (typically the outer shell of the BNC connector).

Again, good test equipment shouldn't have an overshoot on outputs when the mains power is cut. Power outages do happen.
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