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 Network Analyzers using PXI software

Unknown Thru Calibration or SOLR (Short-Open-Load-Reciprocal) is analogous to SOLT calibration, where UNKNOWN THRU is used instead of DEFINED THRU (See figures below).

For this purpose, the software includes an UNKNOWN THRU standard in the description of each predefined calibration kit. This method is used when connecting DUT with connectors of the same type, and of the same gender, when one calibration kit can be used to calibrate both ports.

Unknown Thru calibration

First Stage of SOLR Calibration

Unknown Thru calibration1

Second Stage of SOLR Calibration

By default, in all predefined calibration kits, the UNKNOWN THRU delay value is set to zero. In this case UNKNOWN THRU delay value is detected by the Analyzer automatically. In some cases, it is required to enter the UNKNOWN THRU value manually (See Unknown Thru Requirements). To do this, use the Calibration Kits Editor.


note

If different types of connectors are used to connect the DUT, then a single calibration kit cannot be used for two-port SOLT calibration. In this case, it is necessary to create a description of the user calibration kit, composed of standards suitable for both ports. It is more convenient to use the Unknown Thru Addition. method instead.


The SOLR calibration procedure is similar to the SOLT calibration procedure, described in the section Full Two-Port Calibration.

 

Rev.:  22.3