On Mon, Sep 23, 2019 at 08:04 PM, <erik@...> wrote:
Can you show the measurement? preferably the smith chart of another VNA doing
the CH0 measurement.
I'm talking about OUTPUT impedance of CH0 (don't confuse with INPUT impedance). I didn't hear that it is possible to measure output impendance with another VNA :)
You're needs to measure amplitude on different loads and then calculate source impedance:
Z = (R1 - R1*(U1/U2)) / (U1/U2 - R1/R2)
My measurements for CH0 in attachment. R1 = 1 MOhm, R2 = 50 Ohm. Of course this is just a draft measurement for overage amplitude. I'm too lazy to perform measurement for specific frequencies. :)
