Any news on availability in Europe/Italy? This french store already lists it (with wrong picture) and seems to accept preorders:
http://www.limpulsion.fr/art/SDS1204XE/SIGLENT__Oscilloscope_4x200_MHz_7_decodage
Wow, this unit has 14 MHz of memory!
Joking aside, I see it apparently has 1 GB/s per channel, which is nice. It's also what you'd want in a 200 MHz scope, but it's good the have that confirmed. It does seem to have less memory than a fully upgraded DS1054Z, which surprises me a bit. Other manufacturers seem to consistently have a lot less memory, despite the Rigols selling like hotcakes.
It can imagine like this: (even if construction is different but functionally like this)
It have 4 channels. Or is it better say 2 + 2 channel.
Channels 1 and 2 have one ADC and shared 14M memory.
Channels 3 and 3 have one ADC and shared 14M memory.
ADC is single channel 1GSa/s (internally interleaved 2 channels) and two channel both 500MSa/s
Case A
If what ever single channel is alone in use it have 1GSa/s and max 14M memory.
Case B
If all 4 channels or what ever 3 channels simultaneously in use all have 500MSa/s and all have 7M max memory length.
Case C
If in channel pair 1&2 is only one channel in use this channel have 1GSa/s and 14M max memory lenghth.
Case D
If in channel pair 3&4 is only one channel in use this channel have 1GSa/s and 14M max memory lenghth.
Case E
Case C and Case D (= two channels in use, both 1GSa/s and both 14M max mem)
Case F
If in channel pair (1&2 or 3&4) both channels are in use they have 500MSa/s max and 7M memory max.
500MSa/s is not enough for 200MHz sinewave when Sinc interpolation is used if we want accurate amplitude information and time window is short - as it need be short in oscilloscope. But it is as usable as 250MSa/s for 50MHz. Good amplitude accuracy can typically reach if input frequency is fsample /5.
Here attached image how it looks typically with different sample frequency vs input sinewave frequency.
2.5 means that (example) 200MHz input and sample frequency 200*2.5=500MHz (Msa/s)
Many peoples have heard that all is ok if
fin is <
fNyquist (this is how rules are misunderstooded). Top in image is
fin =
fNyquist/1.25
Attached image is
not from Siglent SDS1204X-E
It is from some my own teaching material without all finnish language explanations.
(btw, also you can find Agilent-Keysight paper about "number 5 thumb rules")
bottom of image there is multiplier 5. (f sample is 5 times f signal)