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Products => Test Equipment => Topic started by: Professzore on June 01, 2018, 09:46:22 am

Title: Rigol MSO1074Plus vertical issue
Post by: Professzore on June 01, 2018, 09:46:22 am
Dear All,
Recently I've experienced an unusual behaviour on my Rigol MSO1074Plus Scope. A set of very basic settings, two measurements have been done one after another. First is at 500mV/div vertical and the second with 1V/div vertical. It is clearly visible that the second measurement is completely useless and lacks anything important for debugging/inspection. I experience the same with anything over 1 V/div setting. I've also tried many other settings (timebase, Display, Acquisition etc.). Same is true for all four channels with all available probes.
All hints are welcome and highly appreciated. Thanks in advance!
Yours Sincerely,
Tamás
Title: Re: Rigol MSO1074Plus vertical issue
Post by: tautech on June 01, 2018, 09:55:20 am
Oh no not another one !
It's normal.

Your waveform must be completely on the display, or within the max offset listed in the scope specs.
The channel 1 0V level indicator pointing down shows the level is clearly off the display.
Get it back onto the display and normal programming will return.  ;)
Title: Re: Rigol MSO1074Plus vertical issue
Post by: JPortici on June 01, 2018, 10:05:54 am
Oh no not another one !

suggestion for the siglent development team: add an OVERLOAD label in future models (or updates, if they have a way to detect the condition)
Title: Re: Rigol MSO1074Plus vertical issue
Post by: Professzore on June 01, 2018, 10:41:17 am
Your waveform must be completely on the display, or within the max offset listed in the scope specs.

Thanks for the suggestion!

Done it, please, take a look at the results!

Ch1 (yellow) completely on the screen, 0 V offset, 5V/div.
Ch2 (blue) -12 V offset, 200mV/div.

Specs: max offsets at 1× probe ratio are
+/-2 V from 1 mV/div to 499 mV/div,
+/- 100 V from 500 mV to 100 V/div.

Ch1 is within the accepted maximum offset (no offset) and shows corrupt waveform,
Ch2 is way off the maximum accepted offset and shows the expected waveform.

I am slightly confused.
Title: Re: Rigol MSO1074Plus vertical issue
Post by: 2N3055 on June 01, 2018, 10:39:50 pm

Ch1 is within the accepted maximum offset (no offset) and shows corrupt waveform,
Ch2 is way off the maximum accepted offset and shows the expected waveform.

I am slightly confused.

No, CH1 is within specifications and shows GOOD waveform.
CH2 shows scope's input chanel overdrive recovery oscilations... 
That 2V pulse would be visible on CH1 if existed....

Oh no not another one !

suggestion for the siglent development team: add an OVERLOAD label in future models (or updates, if they have a way to detect the condition)

Suggestion for ALL SCOPE manufacturers....  :-+
Title: Re: Rigol MSO1074Plus vertical issue
Post by: CustomEngineerer on June 02, 2018, 12:21:36 am
https://www.eevblog.com/forum/testgear/siglent-technical-support-join-in-eevblog/msg1531802/#msg1531802 (https://www.eevblog.com/forum/testgear/siglent-technical-support-join-in-eevblog/msg1531802/#msg1531802)

Excellent explanation of what can happen when you overdrive the inputs on a scope by forum member Performa01