![]() Display negative impedance Smith chart with 1/S conversion You cannot paste a standard into a class, or vice versa. You can do the same with class assignments in the Class Assignments page. You can then cut, copy, or paste the entire row to or from the Windows Clipboard. In the Standard Definitions page, if you click the mouse on a standard number in the far left column of the table, the entire row is selected and highlighted. ![]() This is handy if you want to re-use the standard definition from an existing cal kit in a new one you are constructing. You can use the Cut, Copy, and Paste commands in VNA Cal Kit Manager's Edit menu to copy and paste a complete standard or class definition. Copy complete standard or class in VNA Cal Kit Manager ![]() This problem is corrected in the latest models. Furthermore, on these VNAs standard #5 can only be used as a sliding load - when you attempt to measure #5 during a calibration, the VNA will ask you to "set the slide" no matter how you defined the standard. If you assign the sliding load to any other standard number, the calibration will not work - the error corrected data will be grossly wrong in the sliding load's frequency range. If your calibration kit contains a sliding load, you should be aware that some models of the HP 8753 and HP 8720 network analyzer families will only calibrate properly if the sliding load is standard #5. For example, if your REFLECT standard were a microstrip open circuit, that would be a poor choice - probably better to use the THRU. The idea here is to choose whichever one will give you the more precise definition of the physical locations of your reference planes. If your REFLECT standard is very well defined, like a precision short circuit, then you can use it to set the planes. If the THRU has length, and this length is accurately known, then you can still use it. If your TRL calibration kit contains a zero-length THRU, then use this to set the reference planes. Where these are located will obviously effect the resulting measurements of your DUT (primarily it effects the phase angles of your measurements). This option only matters when you are doing a TRL calibration, and it determines where the network analyzer's reference planes will be assigned that is, the physical locations which are assigned to be the "test ports" of the network analyzer system. SET REF: THRU corresponds to a reference plane set by Thru standard (or the ratio of the physical lengths of the Thru and Line) and SET REF: REFLECT corresponds to the Reflect standard." "The phase reference can be specified by the Thru or Reflect during the TRL 2-PORT calibration. TRL Calibration reference plane - thru vs reflect We have't done any editing to these notes. His site is no more, but he has donated all of his helpful hints to Microwaves101, in exchange for a Laurel and Hardy Handshake, and perhaps a coffee mug. New for November 2005! This material used to have it's very own web site,, maintained by Barry, an Agilent employee.
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