FYI,
I have made the effort and check the reflection on ch1 to ch4
om my SDS2204X model. Looks not very good according to my
opinion. 10dB reflection from 50 Ohm terminated port/channel
means (>3% voltage err or 10% power error) error in maesurement
- right?
I had check the spawn from 0 to 1000MHz.
At the point of 100mV/div coming from the top (10,5,2,1,0.5,0.2V)
the reflection change due to internal switching of components.
All pictures show 50 Ohm terminated channels beside one that
I measure with 50 Ohm disabled (1Meg).
So I present screenshots of my measuring device as well as swr
bridge and cabling and the dso screenshots.
Waiting for your comments.
Markus
Sorry pic. #7 should be labeled with CH3 and not CH1.