Products > Test Equipment
SDS1104X-E Unexpected Behaviour
BillyO:
Yes, I can be .. colorful .. especially when someone introduces themselves with a personal insult. :--
Enough of that for now.
I'll try what you suggest, but I think a key point is that there is no mention of this control in the manual. Almost like it was there for beta test purposes but was not removed for the final product.
I'll report back on my findings.
Edit: Findings below
25% duty square wave, DC, centered
AC, centered
AC, displaced down 1V using "Position" control
DC, displaced down 1V using "Position" control
AC, displaced down 1V using "Offset" control
DC, displaced down 1V using "Offset" control
2N3055:
--- Quote from: BillyO on November 24, 2022, 04:00:58 pm ---Yes, I can be .. colorful .. especially when someone introduces themselves with a personal insult. :--
Enough of that for now.
I'll try what you suggest, but I think a key point is that there is no mention of this control in the manual. Almost like it was there for beta test purposes but was not removed for the final product.
I'll report back on my findings.
--- End quote ---
It probably was the opposite, added later to FW and not to manual...
2N3055:
--- Quote from: bdunham7 on November 24, 2022, 03:59:28 pm ---
--- Quote from: 2N3055 on November 24, 2022, 03:47:32 pm ---Do you see any difference in behaviour now?
--- End quote ---
I tried it and as I expected it made no difference. In the AC-coupled mode, the baseline was displaced to -250mV as you'd expect, but the controls work the same way--if you select 'OFFSET' the multipurpose knob has the exact same effect as the position knob. In the AC mode, the difference between the channel marker and the baseline of the waveform is always -250mV, in DC mode it always lines up.
The only thing different about the offset vs position is that if you push the multipurpose knob, you get the option of entering the value numerically, albeit painfully slowly with the turn/click method.
--- End quote ---
So it was not remembering different settings in AC and DC mode ..
Then it is really only an alias for vertical position button but to be accessed from menu.
I presume it is there because of remote control via HTTP interface...
BillyO:
--- Quote from: 2N3055 on November 24, 2022, 04:12:12 pm ---Then it is really only an alias for vertical position button but to be accessed from menu.
I presume it is there because of remote control via HTTP interface...
--- End quote ---
Yes, as I said in the beginning, it does the same thing but gives it a different name.
Makes no sense for the HTTP interface as it requires several more steps to access it. The position control is easier to get to and easier to use, even through the webserver interface.
My previous post has been updated with the results of your suggestions.
So, my position on this is it is either a bug in the terms I previously described and should be corrected to provide a means to adjust offset of waveform from position, or it should just be removed. It serves absolutely no purpose I can find as it stands.
bdunham7:
--- Quote from: BillyO on November 24, 2022, 04:31:52 pm ---So, my position on this is it is either a bug in the terms I previously described and should be corrected to provide a means to adjust offset of waveform from position, or it should just be removed. It serves absolutely no purpose I can find as it stands.
--- End quote ---
Although you could provide a limited 'digital trim' as your offset, I don't think there's much utility in having some separate offset trim. It would be potentially confusing if you misunderstand it or forget that it is not set to zero. As far as removing the menu item, that might break something as there may be some internal reason that it is there. I would just chalk it up to a not-so-polished UI and ignore it.
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