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SDS1104X-E Unexpected Behaviour

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BillyO:

--- Quote from: bdunham7 on November 24, 2022, 04:44:59 pm ---I don't think there's much utility in having some separate offset trim.
--- End quote ---

There is actually.  I can think of 2 (maybe rare) use cases, but important if you need it.  Maybe Mr. loop, with all his superior knowledge of metrology, could expand on that?


--- Quote from: bdunham7 on November 24, 2022, 04:44:59 pm ---I would just chalk it up to a not-so-polished UI and ignore it.

--- End quote ---
Probably the best way forward.

Simon:
I got a siglent spectrum analyzer at work, not a fan of the interface on that, a working machine is one thing, communicating in another language (that of the user) is a different skill set.

bdunham7:

--- Quote from: BillyO on November 24, 2022, 05:02:49 pm ---There is actually.  I can think of 2 (maybe rare) use cases, but important if you need it.  Maybe Mr. loop, with all his superior knowledge of metrology, could expand on that?

--- End quote ---

On a CRO or other scope where the vertical position has to operate within reasonable limits, the addition of an adjustable DC bias on the input that allows you to offset the input by many divisions worth does have some uses, like looking at PSU ripple and more.  This was an uncommon feature on CROs.  But a DSO like the Siglent SDS1104X-E already has this feature built-in and incorporated into the vertical amplifier system.  Even if you did have some second offset system in the vertical amp, it would just add to or subtract from the first one.  The only other 'offset' I can think of that you could do is some sort of digital trim, but that would have to be pretty limited.  What use case do you have that isn't met by the system in the 1104X-E?

BillyO:

--- Quote from: bdunham7 on November 24, 2022, 11:01:09 pm ---What use case do you have that isn't met by the system in the 1104X-E?

--- End quote ---
Well, there is the case that kind of brought this back for me.  Looking at and making some measurements on a very low frequency not quite square wave signal.  Using AC coupling naturally distorted the waveform.  It would have been handy to use DC coupling and apply an offset to bring the signal back to where it should be.

The other use case is the problem I had before where there was a considerable offset in the vertical ranges below 10mV/div.

Yes, both are rare and both can be worked around, but an offset adjustment would make quick work of that.

bdunham7:

--- Quote from: BillyO on November 24, 2022, 11:27:10 pm ---Well, there is the case that kind of brought this back for me.  Looking at and making some measurements on a very low frequency not quite square wave signal.  Using AC coupling naturally distorted the waveform.  It would have been handy to use DC coupling and apply an offset to bring the signal back to where it should be.

--- End quote ---

Do you mean a signal with a large DC bias?  Or something else?


--- Quote ---The other use case is the problem I had before where there was a considerable offset in the vertical ranges below 10mV/div.

--- End quote ---

This would be like trim or zeroing, I suppose it might come in handy on occasion.  But it wouldn't be stable.  I can't think of a single DSO that implements this directly.  You can do it with a MATH function, but that would be a lot of effort.

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