I would note that the humble SDS1104X-E is 100MHz (unhacked) and has the requested 1GSa/S per channel on two channels as long as you use Channels 1 and 3.
Bit more perfectly
Below table red channel is on. (Independent of if it is displayed or not - in case when one want use one main channel as "better" Ext Trig without trace visible):
Bolded all cases when max is 1GSa/s per channel and 14Mpoints max limit per channel
Ch1 Ch2 Ch3 Ch4 |
(1GSa/s 14M)Ch1
Ch2 Ch3 Ch4 |
(1GSa/s 14M)Ch1 Ch2 Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M)
Ch1 Ch2
Ch3 Ch4 |
(1GSa/s 14M)Ch1 Ch2
Ch3 Ch4 |
(1GSa/s 14M) + (1GSa/s 14M)Ch1
Ch2 Ch3 Ch4 |
(1GSa/s 14M) + (1GSa/s 14M)Ch1 Ch2 Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M)
Ch1 Ch2 Ch3
Ch4 |
(1GSa/s 14M)Ch1 Ch2 Ch3
Ch4 |
(1GSa/s 14M) + (1GSa/s 14M)Ch1
Ch2 Ch3
Ch4 |
(1GSa/s 14M) + (1GSa/s 14M)Ch1 Ch2 Ch3
Ch4 | (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M)
Ch1 Ch2
Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M)
Ch1 Ch2
Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M)
Ch1
Ch2 Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M)
Ch1 Ch2 Ch3 Ch4 | (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M) + (500MSa/s 7M)
About frequency response SDS1104X-E and (front panel model plate SDS1104X-E but working las 200MHz model,)
When SDS1204X-E USER need understand that unknown signal under inspection may have so high frequency components that it produce aliasing in ADC specially when ADC is non interleaving mode (Max 500MSa/s)
This is common problem when oscilloscope do not have sampling speed dependent filtering BEFORE ADC. Of course some can do using DSP filters after ADC but it can not know if its input is down conversion from ADC what works also as frequency converter.
eevblog.com/forum/testgear/siglent-sds1204x-e... some tests with unmod and mod versionFor OP.
This meet minimum needs: 2 channel least with 1GSa/s both and also true BW goes far over 200MHz.
For some note about 50 ohm inputs.
Many, most of, this kind of scopes do not have real 50 ohm impedance inputs for full BW.
Mostly 50 ohm inputs are 50ohm DC resistance inputs. Just relay switched 50ohm resistor parallel with normal 1M/20pF pathway including also PCB traces and relay parasitic C's and L's network.
It works somehow up to perhaps 50-100MHz but after then start more or less troubles. Most easy it can see with known fast edges where is lot of higher frequency components what then may make totall mess and peoples looks scope screen and "believe" more or less they see and then talking here how miraculous things they see in "caleidoscope" window....
All what can see is sum of errors mixed with bended truth. Why bended truth... bended because you touch signal and change it in curcuit, more or less...
...wise can estimate and make his own decision how much he can tolerate these all errors.
Because he have experience with HP1740 or what ever other nice professional class analog scope I will recommend 2GSa/s scope with enough long max acquisition memory length what can keep maximum or high sample speed even with more slow t/div settings. Analog scope have always full BW with what ever t/div, even slowest possible, without any aliasing with what ever signal. This do not never happen with normal usual this class of digital oscilloscopes and if think really tight, it do not happen even with most expensive most modern "rolls royce" class digital scopes.
One nice scope is SDS2202X-E/SDS2352X-E both are 2 channel models max 2GSa/s but thuis speed is only if one channel is in use.
Also it is good to keep in mind that 2 channels and EXT trig... well, EXT trig do not have at all same features and performance as is main channel trigger. EXT Trig pathway is totally very different. And THIS is not any Siglent special... I do not know any scope what have full speed ADC and front end in EXT trig pathway. These modern scopes mostly today have full digital side trigger engine in main channels but then EXT trig is cheap version of analog trigger where trigger jitter is high and many other ways quite poor performance.
But, SDS2000X Plus version, 4 channel models. They have 2GSa/s for two channels (same logic as above, afaik)
Also there is EXT trig but if usually need 2 main channels then there is 2 channels what can use as EXT trigger also but now with full main channel trigger functions and performance. All know that trigger make scope and Siglent digital side trigger engine performance is least very good. Rumors tell that some models can also "improve" quite nicely.