I could need some advice on what i am doing wrong with my Kirkby cal-kit.
(Please appologise stupid questions, since VNA measurements are totally new to me
)
My setup consists of:-) HP 8753E VNA (6 GHz)
-) Kirkby 85033 SMA calkit
-) 50 cm RG316D koax
I followed the instructions on the Kirkby 8753 page here:
http://www.kirkbymicrowave.co.uk/support/VNAs/HP-Agilent-Keysight/8753/On the floppy disk there are 3 files (SMA, SMA_M_M, SMA_F_F).
I selected "SMA" and loaded it with "RECALL STATE".
Is that the correct file to choose?
After that, the frequency range is automatically changed to 300 kHz ... 3 GHz.
Shouldn't it be set to the full range of 30 kHz - 6 GHz of my VNA?
Next, i start a "S11 1-Port" calibration.
When selecting "OPENS", a new menue appears and asks me for "OPEN (M)" or "OPEN (F)".
Since i am using the female-open, i guess selecting "OPEN (F)" is correct here?
The same applies to the SHORT.
Just the "LOAD" does not open a sub-menue for (F) or (M).
Ok, so after i finalize the calibration by pressing "DONE 1-PORT CAL", i set the VAN to Smith-chart to verify if calibration is correct.
I do this by attaching the SHORT again and check if the Smith-chart gives me a point at the short-position.
However, i don't get a dot at the short position but a line reaching from short to almost infinit on the upper, outer pure inductor circle.
Similar, just mirrored is displayed when the OPEN reference is connected.
For compensation, i applied a port extension of 58.14 ps and get the expected results (dots) with all 3 calibration standards.
I thought that with the complete calibration data on the floppy disk, there would be no need for manual port extension entry?
Or maybe i am doing something completely wrong here?
Thanks
P.S.:
Another thing that irritates me is that the 50 Ohm references are 49,5 and 51,1 Ohm instead of "50,0".
I would expect to get better quality references for that price?