Hi,

I'm using the VNA uncertainty excel tool to get a glimpse of the uncertainty of the VNA I'm using. It's the N5245A Option 400 VNA. Using N4691B ECAL. I'm having trouble understanding why there are multiple lines in the dynamic accuracy graph. This seems sort of like a Pout/Pin graph that they used in college to show 1dB compression points. But why are there multiple lines? Does each line represent the power level at calibration? I've attached the graph I'm looking at. If you could give me a short simple breakdown of how to read this graph I would greatly appreciate it. And fyi, I've looked in Dr. Joel's book and other resource to try and figure it out and I'm just not sure.

Thanks,

KTB

I'm using the VNA uncertainty excel tool to get a glimpse of the uncertainty of the VNA I'm using. It's the N5245A Option 400 VNA. Using N4691B ECAL. I'm having trouble understanding why there are multiple lines in the dynamic accuracy graph. This seems sort of like a Pout/Pin graph that they used in college to show 1dB compression points. But why are there multiple lines? Does each line represent the power level at calibration? I've attached the graph I'm looking at. If you could give me a short simple breakdown of how to read this graph I would greatly appreciate it. And fyi, I've looked in Dr. Joel's book and other resource to try and figure it out and I'm just not sure.

Thanks,

KTB

So, if you set your source power to -20, and measure and amplifier with 20 dB gain, you would use the curve that has -20 for the reference and look up the error at 0 dBm.