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The SMA connector is designed for at least 12GHz and 50 Ω impedance, so should be OK for this application.
Interesting, there is a recent firmware upgrade for the DSO3D12 which adds a frequency meter and pulse counter.This appears to be a similar specification to the feature found on the DSO154Pro (HW V1.4). The DSO3D12 seems to have a higher upper frequency limit.It may be that the feature on the DSO154Pro is also HW/FW dependant, since this seems to be the case for the DSO3D12. (Attachment Link) A thread describing the DSO154Pro frequency meter and counter is shown below.https://www.eevblog.com/forum/testgear/new-toy()-scope-dso154pro-1ch-claimed-40mss/msg5418215/#msg5418215
Do you know if this new firmware is also available for hardware version V1.1 and firmware version v1.1.2? ZEEWEII appears to say that it has recently upgraded the DSO3D12 hardware, but does not provide any further information on its website.