Using the NCV032B VNA calibration and verification kit on Rohde & Schwarz vector network analyzers

It is absolutely essential that a VNA has the correct calibration constants for a calibration kit. Just taking random opens and shorts, and picking the N calibration kit from your VNA will result in incorrect measurements. They might look fine, and show a nice flat S12 and S21 of close to 0 dB, and an S11 and S22 of -60 dB or more, but the results of any measurements will be incorrect.

Since no HP Rohde & Schwarz vector network analyzer will have the correct constants for this calibration kit, these must be entered as a user-defined calibration kit. The method of doing this is will be given in the Rohde & Schwarz manual for the VNA and must followed closely. The following details must be entered:

NCV032B Calibration kit
Type C0 fF C1 fF/GHz C2 fF/GHz2 C3 fF/GHz3 L0 pH L1 pH/GHz L2 pH/GHz2 L3 pH/GHz3 Offset length (mm) Loss (dB/sqrt(GHz)) Label
Female short         0 0 0 0 0.02998   Short(f)
Female open 119 0 0 0 -4.107 Open(f)
Male short         0 0 0 0 6.409   Short(m)
Male open 62.14 -0.14307 0.08292 0.00076 5.21969 Open (m)
Female-Female thru 24.343
Male-Male thru 38.973

The 50 Ω Female to female barrel has a delay of 81.2 ps

After making a 2-port calibration using a SOLT technique, if the DUT is non-insertable (i.e. it has two male ports or two female ports), then it necessary to add an adapter. The kit is supplied with two barrels which allow you do make measurements on non-interstable devices. In order to get accurate phase results, you must compenstate for the delay caused by the barrel. One does this by seting a port extension on the CAL menu of the VNA. If you add the female barrel to test port 1, then set a port extension of +81.2 ps. Depending on the design of your VNA, it may be necessary to enter that as 0.0812 ns, but the display should show 81.2 ps.
Female to female barrel

The 50 Ω Male to male barrel has a delay of 130.0 ps

Male to male barrel
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