On professional VNAs like the 8753, the internal isolation of the hardware is so good that the isolation calibration step is only useful if you are using a fixture that has isolation problems.
For the NanoVNAs (of all flavors, I think), the internal isolation is not so great, and the added calibration step can help improve the dynamic range of S21.
--John Gord
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On Sat, Feb 18, 2023 at 02:19 PM, W0LEV wrote:
Many times, it's appropriate to skip the isolation cal. Even
professionally, HP (the 8753C) gives one the choice to specifically skip
isolation. If you do conduct the isolation cal, terminate both ports with
a good 50-Ohm load.
Dave - W?LEV
On Sat, Feb 18, 2023 at 8:43 PM tekguy la <uktekguy@...> wrote:
Hi,what do i do during the cal when it gets too the isolation?,ive seen a
few vids but its not clear,do i connect the 50 ohm load to ch 0 or leave
nothing connected to that port,or put the load on ch 1 ,its not clear what
i need to do.
--
*Dave - W?LEV*
--
Dave - W?LEV
