Internal jitter in DSO4202C oscilloscope

Sead

Hello there,


I bought recently a new DSO4202C oscilloscope. The product looks quite good and all functionalities are

good except taht on the higher frequencies the input signals are presented somewhat distorted and with
considerable jitter.


The same input signals are presented on the Keysigh/HP oscilloscope clear and without the jitter.


Does someone experience similar problems and can give me useful hints on how to get around this?


Thanks in advance
Sead

Sead

I performed Pass/Fail Test and it looks like this:



How can I interpret this? Does it means that the Hardware is affected?

Sead

OASJ2YSeeEhBQo1 replied at 2019-10-1 06:03
Try to use average mode in the Acquire menu button.

Thanks, I did it. The waveform is changing amplitude and phase considerably from one screen to another, I assume,  due to averaging ecffect. I performed Pass/Fail Test and it looks miserable. Any other idea?

OASJ2YSeeEhBQo1

Try to use average mode in the Acquire menu button.

Sead

On 30.09.2019 I did firmware upgrade to sw version 3.5.0(190613.0) hoping that the internal jitter issue in my DS4202C oscilloscope will be resolved.As you can see from the enclosed photo, this was not the case - the jitter is still prersent and influences all measurements (frequency,  amplitude,
period, rise- and fall-times etc).


Questions:
- have you experienced such behavior on yours DSO4202C oscilloscopes?
- does someone knows what is the problem and how this can be eliminated?
Thanks in advance.
Sead

Sead

wangshuang replied at 2019-9-29 16:51
please downlown the latest firmware in Hantek homepage and update the system.
http://www.hantek.com. ...

Hello Wangshuang,

I updated the system with the latest firmware as you suggested, but no improvement.
This fault makes all measurements questionable and as far as I can see it is present by other users as well. Many of them are possibly not aware of this.

Regards Sead

wangshuang

please downlown the latest firmware in Hantek homepage and update the system.
http://www.hantek.com.cn/en/ProductDetail_3_4163.html

wjw

I have noticed the same problem when I looked at a 21 MHz sinewave.  I compared it to a Rigol oscilloscope, and I don't see the jitter.

Sead

Hi OASJ2YSeeEhBQo1,

Thank you very much. Does that mean that the measurements of the signal rise-times, amplitudes and frequency are inaccurate? I mean if the oscilloscope is averaging signal with the jitter introduced by itself, than the measurements of input signal are inaccurate. I do not have such problems with my 100 MHz scope from HP.

Kind regards
Sead

Sead

Hi TMG,

Thanks for your reply. I used my 50 MHz reference with -10 dBm clean sinus output . Checked that also with 100 MHz oscillator with the same results. The 50 MHz signal appears stable and clean on a HP 100 MHz oscilloscope.

Kind regards
Sead