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.
First Stage of SOLR Calibration
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.
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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.
