Hi, I have a PNA E8357A and I am using a 85032A cal. kit and a 85055A ver. kit. I did a one port cal and measured the S11 of an airline terminated in a short, I got what is in pictures 2 and 3 then I did a two port cal. and masured S21 I got what is in picture 1. Anyone can tell me what this means and what is wrong with that.
Thanks
Edited by: theamberco on Aug 22, 2014 5:22 PM
Thanks
Edited by: theamberco on Aug 22, 2014 5:22 PM
The fine grain ripple is due to a bad cable. From the frequency of the fine-grain ripple you can compute your cable length. The slow ripple is due to cal-kit error. The ripple of +-0.3 dB means you have a combination of source match and directivity error of -30 dB. It could be that each is about the same, and each is about -36 dB.
I think the 85032A cal kit is the older one and it looks to be specified to only 2 GHz. Thus it might have a low-band load which is tuned to 2 GHz and has poorer performance at higher frequencies. It might be a case of "you get what you pay for, not what you hope for".