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Siglent SDS1102CML 100MHz Good beginer scope?

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David Aurora:

--- Quote from: BillyO on August 12, 2023, 03:23:25 am ---
--- Quote from: David Aurora on August 12, 2023, 02:37:53 am ---- Which Siglent scope? This one, or another model?
--- End quote ---
I specifically state they were different than yours.  They are an SDS1000XE model and a SDS2000XP model.


--- Quote from: David Aurora on August 12, 2023, 02:37:53 am ---- Define "immediate". On a CRO, if I even tap a probe on or off a test point I'm going to see it on the display in real time. On this thing there's enough lag that I can often be looking at the DUT, lift the probe off, look up at the scope and see the signal for a split second before the trace disappears. No idea what the actual lag length is, I think it varies, but I'd imagine it's 500mS-1S or something like that? Not the end of the world, but enough to make me second guess probing things on many an occasion, and a huge reason why it was never my daily driver.

--- End quote ---
By immediate I mean as soon as the signal crosses the trigger level and the scope acquires the data.  Again, if you have the trigger set to "Auto" it may delay the display of the signal until the current sweeps completes.  If you set the trigger to "Normal" it will begin to acquire the signal as soon as the signal crosses the trigger level then display it.  With really slow sweep times (10ms/div or slower) you might still see a short delay, but generally not near as bad as your saying.  Unless there is something amiss with that specific model.  Is your firmware up to date?

--- End quote ---

Yeah, sorry, I saw that you said "both different" but assumed you meant two different Siglent models with one of them being this one as it didn't seem to make any sense for you to be telling me how this model behaves if you don't actually have one.

I have the scope in the thread title, I know how to use a scope, and this is the behaviour I get.

It's the kind of issue that becomes really obvious when sweeping a signal generator for frequency response checks or adjusting bias and stuff like that- on my Siglent you have to keep in mind that there's a lag, so by the time you see the frequency peak/dip or crossover distortion change or whatever it is you're trying to tweak in real time you've likely already gone past it.

Maybe someone who also has one can chime in and confirm if mine is faulty or if this is normal behaviour for the model, but it's been like this from day one and through all firmware updates. I always just assumed that this was normal behaviour for a DSO of that era and price range, it's never been my primary scope so I didn't lose sleep over it. It's fine for observing steady signals, single shot captures and whatnot, but the OP was asking about it for servicing audio gear and as an audio gear service guy who owns one I think mine sucks for that task.

tautech:

--- Quote from: David Aurora on August 12, 2023, 07:06:18 am ---Maybe someone who also has one can chime in and confirm if mine is faulty or if this is normal behaviour for the model, but it's been like this from day one and through all firmware updates. I always just assumed that this was normal behaviour for a DSO of that era and .....

--- End quote ---
Like any DSO they have to process the sample points then push them to the display therefore the mem depth set can impact on responsiveness in some situations.

However the user is in charge of his/her instrument and need learn how to use it to best effect.
Need a long capture then set the mem depth to max.
Want faster performance cut it back some.

This is the reason midrange DSO's are using PC based processing and custom ASIC's.

David Aurora:

--- Quote from: tautech on August 12, 2023, 08:26:55 am ---
--- Quote from: David Aurora on August 12, 2023, 07:06:18 am ---Maybe someone who also has one can chime in and confirm if mine is faulty or if this is normal behaviour for the model, but it's been like this from day one and through all firmware updates. I always just assumed that this was normal behaviour for a DSO of that era and .....

--- End quote ---
Like any DSO they have to process the sample points then push them to the display therefore the mem depth set can impact on responsiveness in some situations.

However the user is in charge of his/her instrument and need learn how to use it to best effect.
Need a long capture then set the mem depth to max.
Want faster performance cut it back some.

This is the reason midrange DSO's are using PC based processing and custom ASIC's.

--- End quote ---

Or just use a CRO   ;)

There are definitely great things about DSOs, but it really is hard to beat a CRO for audio work

BillyO:

--- Quote from: David Aurora on August 13, 2023, 02:04:42 am ---Or just use a CRO   ;)

There are definitely great things about DSOs, but it really is hard to beat a CRO for audio work

--- End quote ---
I too like CROs.  I have two of them right now and both get used.  A Tek 465 and a Heathkit IO4205.

I just got the Heathkit a few weeks ago and have just finished getting it working right.  It's a very basic scope but so easy and intuitive to use.  A perfect learnings tool and at 5MHz, pliantly good for audio and LF radio.  It was a nostalgia purchase because I built the single channel version back in the '80s.  Since I don't do a lot of Audio work it will probably not see an excessive amount of use, but for $40 I couldn't pass it up and it will be used.

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