Products > Test Equipment
Siglent SDG1032 as bad as rigol DG812?
rf-loop:
--- Quote from: nctnico on May 19, 2024, 07:54:44 pm ---
--- Quote from: eTobey on May 19, 2024, 05:22:10 pm ---
--- Quote from: rf-loop on May 19, 2024, 04:52:32 pm ---
--- Quote from: eTobey on May 19, 2024, 03:00:43 pm ---
--- Quote from: rf-loop on May 19, 2024, 02:04:22 pm ---
--- 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)
--- End quote ---
If you set up values, that are far away from those that showed the issue, and want to compare, you also have a problem between the chair and the screen.
--- End quote ---
|O YOU ask'd this (if you remember)! And you get it.
And it still didn't show the problem you so desperately hoped for.
--- End quote ---
Of course it did not mean those values that i told you. |O
I talked about spikes that went up to ~5V but you already set a level of 10V! :palm:
Are you trying to hide the issue, or are you trying to make me look bad?
--- End quote ---
You make a good point here. When the generator is set to maximum output level, the output value is very unlikely to overshoot in the same way you and mortymore have shown. However, with a lower output level, the generator could overshoot when a mains interruption occurs. IOW: rf-loop should test with the same levels you and Mortymore have used. His screendump in the other thread does already show some negative undershoot.
--- End quote ---
Looks like you did not read what I have told previously. Several tests with also using several different setups, example voltages and so on.
With few exceptions, this forum is starting to look more and more like some kind of clown club.
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
Here below some few samples about tests. And these are one shots. Not selected shots like "try until wanted result". Maybe some others can do that on purpose.
SDG1000X
FW:1.01.01.33R1
HW: 02-02-00-24-00
Max Out V: 0-10 Vpk, 20Vpk-pk (HiZ Load and up to 10MHz. Over 10MHz half level)
Source impedance 50 ohm.
2pcs Suhner RG223/U between SDG and oscilloscope.
SDS2504X HD. Inputs 1 Mohm
10 kHz, 1 Voffset, 300 mVpp
1 kHz, 0 V - +5 Vpk
10 kHz, 0 V - +5 Vpk
a. 1 MHz, 17.5 Vpp
b. 1 MHz, 17.5 Vpp
1 kHz, 17.5 Vpp
10 kHz, 17.5 Vpp
1 kHz, 10 Vpp
10 kHz, 10 Vpp
1 kHz, 5 Vpp
10 kHz, 5 Vpp
1 kHz, 2.5 Vpp
10 kHz, 2.5 Vpp
1 kHz, 1 Vpp
10 kHz, 1 Vpp
1 kHz, 500 mVpp
10 kHz, 500 mVpp
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.
EOC
nctnico:
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.
eTobey:
--- 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.
eTobey:
--- 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.
csuhi17:
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.
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