Hello Rudi!
As I said, very thorough and detailed work.
You asked for comments
...
Firmware update frequency :
10 updates in 56 months is 5,6 months between updates
6 updates in 22 months is 3,66 months between updates
8 updates in 56 months is 5,6 months between updates
That makes it that Siglent has almost twice the update frequency, not same as others.
Not that frequency it is very important. Quality of updates, amount of bugs resolved and new features added would be more important. But that would be hard to measure and quantify.
All in all RB2000 and SDS2000X+ had significant quality improvements (RTB2000 came out very unfinished and buggy), and had added functions that they didn't have initially (where SDS2000X+ had some nice features, new protocols added more than others). Keysight OTOH is much simpler platform and has much less features, releases were mostly bug fixes and paid features unlocks. In my opinion, all 3 of them has shown manufacturers dedication to giving good product to customer.
Channel lights comment:
RTB and Keysight light up all the channel buttons for channels that are on. SDS doesn't. It lights up button only for a channel you're editing (or math or ref).
But all of them already show ON screen which channels are ON/OFF. So that information is readily available on the screen. Showing that also on the buttons is redundant.
But when you want to know which channel you're editing, on RTB2000 that is
not obvious from the screen, and is signified
by only color coding of
rings around rotary dials, and
slightly brighter font display for that channel.
On Siglent you can see
directly on the button which one you're editing. 1 or 2 or 3...
I find that
much clearer and obvious, not to mention that it works for people with
color vision problems....
With
single knob for all channels most important info is
what are you currently editing (what is currently selected channel for editing). What channels are active is
clearly and quite obviously visible
on the screen.
On this I disagree with you: Siglent choice is
more ergonomic despite not being what you
expect.
This buttons behavior is probably remnant (old habits die hard) from previous scopes that had
individual buttons and all you wanted to know is which channels are active.
I have it on MSOX3000T and it
makes sense there, with
individual channel buttons.
But
even on on that scope, those elements that don't have individual buttons but
share two dials(FFT, MATH, REF, DIGITAL) work
exactly like Siglent: LED is lit
only for the one you're editing,
not for all the one that are enabled.
Since Siglent
shares same set of knobs for all channels and other functions (channels, math, ref etc.) it does it like that for
all of them. It is actually
logical.
Again, admire the work you're putting in, very well done. I think it will be of great service to community..
Best,
Sinisa