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Siglent SDS1102CML 100MHz Good beginer scope?

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BillyO:

--- Quote from: Performa01 on August 10, 2023, 09:45:00 am ---SDS1104X-E: is 4 channels, which you don't really need;

--- End quote ---
Until you do.  I'd never willingly go back to not having a 4ch scope again.  Especially if your doing anything with computers.  Sometimes I'll even connect my SDS1000XE and my SDS2000XP to get 8ch. :scared:   Not often, but it's been done.

David Aurora:
If it's all you can get it'll do. But I wouldn't recommend chasing one.

I've had one of these for years, though it spends most of its time on a storage shelf because 99% of the time I use analog scopes. It's a pain to trace audio with it, there's so much lag between touching the probe to the circuit and actually seeing a result. Probably totally fine for some applications, but it drives me nuts to trace signals with.

Not sure if your function generator question was related to this particular scope, but if so- no, it doesn't have one.

I haven't followed used pricing on these, but for what it is I certainly wouldn't pay that kind of money for it in 2023. If you're doing audio you could grab a good quality used analog scope AND signal generator for that price range and you'll be a lot better off.

BillyO:

--- Quote from: David Aurora on August 12, 2023, 01:23:03 am ---It's a pain to trace audio with it, there's so much lag between touching the probe to the circuit and actually seeing a result.

--- End quote ---
Odd.

I just tried that on both my Siglent scopes (both different) and with a 1ms/div sweep rate signal trace is visible immediately.

Mine are different models, but even with my old cheap UNI-T POS signal is immediate.  :-//

What frequency were you trying trace and how many cycles did you want to see on the screen?

If I try to look at 10Hz and want to see 10 cycles on the screen (a "rare" scenario) it can take a little while (1 sec) to draw the full trace, as it would with any scope, analog or digital, but it triggers right away.  Maybe you were looking at low frequencies and had the trigger on "Auto".  That might cause a delay, but that is a set-up problem, not a scope problem.  In that scenario the trigger would need to be set to "Normal". 


 

David Aurora:

--- Quote from: BillyO on August 12, 2023, 02:07:01 am ---
--- Quote from: David Aurora on August 12, 2023, 01:23:03 am ---It's a pain to trace audio with it, there's so much lag between touching the probe to the circuit and actually seeing a result.

--- End quote ---
Odd.

I just tried that on both my Siglent scopes (both different) and with a 1ms/div sweep rate signal trace is visible immediately.

Mine are different models, but even with my old cheap UNI-T POS signal is immediate.  :-//

What frequency were you trying trace and how many cycles did you want to see on the screen?

If I try to look at 10Hz and want to see 10 cycles on the screen (a "rare" scenario) it can take a little while (1 sec) to draw the full trace, as it would with any scope, analog or digital, but it triggers right away.  Maybe you were looking at low frequencies and had the trigger on "Auto".  That might cause a delay, but that is a set-up problem, not a scope problem.  In that scenario the trigger would need to be set to "Normal".

--- End quote ---

A few things:
- Which Siglent scope? This one, or another model?
- 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.

BillyO:

--- 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?

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