A case in point was the original first SDS2000 with 35 Mpts memory that later with FW was enlarged to 70 Mpts yet no datasheet ever reflected this.
Or later release a new tweaked model of much the same instrument like SDS2000X, now with 140 Mpts memory.
i'm not sure if i understand.
Originally old SDS2000 (yes
without X) come with single or dual* 35M memory length. And there was no any hack but some peoples have made BW modification in hardware.
Later one Siglent FW update rise memory length to single or dual* 70M. (Perhaps due to more wise memory mapping.) It was already there in hardware.
Next model, SDS2000X have single or dual* 140M max acq. memory length just from this model start.
And now SDS2000XPlus single or dual* 200M.
*) In 4 channel models where construction is 2x(1ADC+1MEM)
In 2 channel models construction is 1x(1ADC+1MEM)
SDS1104X-E (4 channel) construction is 2x(1ADC+1MEM)
SDS1104X-U (4 channel) construction is 1x(1ADC+1MEM)
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Other question, not releted to this quoted msg at all.
What is real truth about Rigol DS1000Z FFT
Manual tell it is 1200pts and then some kind of memory mode 16kpts.
Now I have heard it is 64kpts.
I have not seen any example or test image where can see this exactly. I have not seen after some search where can see amount of bins or df. Why it so difficult.
Also this compare tables do not tell anything about true V/div things... yes I know it is display scale but imho more important is, what is full resolution V/div and what are then just magnified. As example in some Keysight model 1mV/div is digitally magnified from 4mV/d.
If one have true 1mV/dif and other have this magnified 1mV/div is there apple vs apple. My opinion is - not. Even if we do not talk sensitivity but we change it to siplay scale. Next time some make 100uV/div display scale and advertise in data sheet and sales brochures they have 100uV/div...
Of when we put rigol frame redorder to same row where other are segmented memory acquisition or sequence. Apple vs apple... oh well I have seen many kind of apples.