After having done a 2-port BNC calibration from 100 kHz to 2 MHz with the Nano-H4 (version 0.5.0) then the CH1 LOG MAG =0.01...0.02 dB of the Cal Thru. Perfect!
When I connect the H4 to the PC and use Nano-Vna saver 0.39 then before I press Connect to Device I select the Cal menu on the H4 and press Reset.
Then I press Connect to device and select my frequencies (100 kHz to 2 MHz) with 1 or 4 segments.
In Sweep settings menu the Attenuator in port CH1 (s21) in dB = 0.
Then I press Calibration and press RESET. Calibration components show all UNCALIBRATED.
I am using the Calibration Assistant.
At the end of the calibration I press Apply. As a result the s21 curve of the Cal Thru is a horizontal line with a possitive value of 0.15 dB.
I repeat the calibration on the H4 and again the result of the Cal Thru is CH1 LOG MAG =0.01...0.02 dB.
After repeating the Calibration with Nano-VNA saver the result is the same as the first time a horizontal line with a possitive value of 0.15 dB.
Is 0.15 dB as a result for a (not removed) Cal thru a usual value or has it also to be 0.01...0.02 dB?
I had expected 0.01...0.02 dB in both cases.
Any idea?
Kees
