Products > Test Equipment
SDS1104X-E Unexpected Behaviour
tautech:
--- Quote from: BillyO on October 24, 2023, 06:55:57 pm ---
The reference position can only be set to "Fixed Position" or "Fixed Offset" and is not adjustable.
--- End quote ---
It is, sorta.
With the scope controls place the portion of the waveform you wish to inspect near the 0V position and engage Fixed Offset.
Now zoom in with V/div.
Return to Fixed Position for normal use after needing large offset settings.
BillyO:
Right, but you can't take out a large DC offset that may exceed the scope's input range of you zoom in too much.
In any case, I just came back from a long walk during which I was thinking about this. If Siglent have not allowed for programmable DC injection into the front end (somewhere before the ADC) it might not be possible to do this. Software can only do so much and won't be able to deal with what is physically out of range for a particular attenuation.
Performa01:
Just to get a common understanding on the atatus quo:
All Siglent X- and A-Series DSOs have only an offset control. They utilize a dedicated DAC to produce a voltage that gets injected in the LF path of the input buffer, enabling the offset compensation ranges as specified in the datasheets.
The physical knobs on the scope are still labelled "Position" (if they are labelled at all), as we are used to since the old days of analog oscilloscopes. Nevertheless they control the offset - and by doing this, we can also set the trace position. Just add or subtract the required offset.
The thing is, that this also shifts the reference point, which is indicated by the small triangle at the left edge of the screen. Without offset, this reference point is always in the vertical center of the screen.
If I understand correctly, you would want to have the reference point adjustable across the screen height and the small triangle should stay there in place, regardless of the (additional) offset setting.
I can unerstand such a desire - it might come handy sometimes - yet it would require one more control element. It might be hard to decide which one is more important, offset or position. Only one control can be on the physical knob, the other one has to be tucked away in the menu system. It would be easier on the touch scopes, where we could have one control in the channel tab, which is easily accessible. I would say, offset is the important one, whereas you should not need to change the reference point that often once you've made up your mind.
Since this would be a major change in the philosophy of offset/position control and this is the first complaint about that I'm aware of, we would need really good arguments why the current solution is not sufficient.
BillyO:
--- Quote from: Performa01 on October 25, 2023, 09:25:38 am ---Since this would be a major change in the philosophy of offset/position control and this is the first complaint about that I'm aware of, we would need really good arguments why the current solution is not sufficient.
--- End quote ---
Did you look at that video? A good reason for having it is mentioned there and apparently it's reason enough for Tek to include it in at least some of their scopes.
To answer your other question. Position would take priority of course. You only have to use offset once in a while, but when you need it, it would be great to have it. Are there ways around it? Sure there are, but they are a lot of extra work. Just like there are ways around most of the math functions and being able to run automatic Bode plots.
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