Connect the short, press the softkey SHORT, and when it is done measuring (quickly) it will underline the SHORT. You will be prompted to put calibration standards on the end of your cable.Choose S11-1 port or S22- 1 port (depending on which cable you want to use).Generally this is CAL1-7mm because that is the type of cable connected to the network analyzer. Do this by pressing MORE on the soft menu on the screen, then DELETE CAL SET, then choose a number.

Delete a calibration set to make room for yours. On the STIMULUS control, press start and type the frequency you want to start. Choose a calibration kit for the type of connector you are using.Calibrate the network analyzer (S11 or S22 Reflection Measurements only). Be careful with the network analyzer cables. Attach connectors and extra cables to the network analyzer as needed.Turn on the power (start with the source under the bench, and move up.) You will turn on four 'Line/Power' buttons.Put on a grounding strap (everybody ALL the time!).When you measure it, the result is also an arc on the Smith chart.Calibration and S-parameter Measurements with the Network Analyzer For mechanical construction reasons, the actual short circuit is a small distance away from the calibration plane, so the short standard looks like a short circuit at the end of a very short transmission line. In most cal kits, this same argument applies to the short standard as well. Because the goal of the calibration is to make your measurement system give accurate results, and the open standard is not ideal, so it is correct that the calibrated measurement system to report the OPEN has some capacitance value! All of these imperfections are included in the model of the open as described in the calibration kit. It has nonlinear fringing capacitance, electrical length, and possibly some loss due to radiation. We understand that a PERFECT OPEN has a reflection coefficient of one at an angle of zero degrees at all frequencies. However, the cal kit's OPEN standard is not an IDEAL open. This measurement result is actually correct - there is nothing wrong with the network analyzer system or the calibration. but in fact the measurement of the open will look like an arc instead of a dot. Question When we measure the OPEN or SHORT reflection on a VNA, why the results is in arcs, but not a dot, on a Smith Chart as most people expect?Īfter performing a one-port or two-port calibration on your network analyzer, some people expect to see a perfect dot at the edge of the Smith chart. Frequently Asked Questions (FAQs) SummaryIt’s normal to get an arcs instead of a dot for OPEN and SHORT calibration kit in Smith Chart after the calibration.

Two port thru calibration smith chart