A three-port TRL calibration consists of three two-port TRL calibrations between three pairs of ports. For example, when 1-2-3 ports are calibrated, three two-port TRL calibrations between ports 1-2, 1-3 and 2-3 must be performed.
A simplified three-port calibration consists of two two-port TRL calibrations. For example, when 1-2-3 ports are calibrated, two two-port TRL calibrations between any pairs of ports must be performed (e.g. 1-2 and 1-3).
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To open three-port TRL calibration submenu, use the following softkeys: Calibration > Calibrate > 3-Port TRL Cal |
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Select the port pair to be calibrated using Select Ports softkey. |
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To toggle between normal and Multiline TRL calibration, click Toggle softkey. |
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To perform measurement of the TRL THRU, click Thru/Line. Then for the three pairs of ports (or for two pairs in case of the simplified calibration) repeat the following: •Connect a TRL THRU (THRU or LINE) standard between the m and n test ports. Perform measurement using m–n Thru/Line softkey. •The instrument status bar will indicate Calibration in progress... when the measurement is in progress. On completion of the measurement, a check mark will appear in the left part of the softkey. Upon completion of the two measurements, the label on the remaining softkey changes to Optional, what indicates that for simplified calibration a sufficient number of measurements have been performed. |
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To perform measurement of the TRL REFLECT, click Reflect. Then for the three ports repeat the following: Connect a TRL REFLECT standard to the test ports in any order. Perform measurement using Port n softkey. The instrument status bar will indicate Calibration in progress... when the measurement is in progress. On completion of the measurement, a check mark will appear in the left part of the softkey. |
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To perform measurement of the TRL LINE, click Line/Match. For the three pairs of ports (or for two pairs in case of the simplified calibration) repeat the following: Connect a TRL LINE/MATCH (LINE between the test ports or two LOADs to each port). Perform measurement using Port m-n Line/Match softkey. The asterisk on the softkey labels prompts what pairs of ports have been calibrated with the TRL THRU standard. The instrument status bar will indicate Calibration in progress... when the measurement is in progress. On completion of the measurement, a check mark will appear in the left part of the softkey. Upon completion of the two measurements, the label on the remaining softkey changes to Optional, what indicates that for simplified calibration a sufficient number of measurements have been performed. |
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To complete the calibration procedure, click Apply. This will activate the process of calibration coefficient table calculation and saving it into the memory. The error correction function will also be automatically enabled. |
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System correction will turn automatically off when Apply softkey is pressed to perform TRL calibration (See System Correction Setting). |
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To clear the measurement results of the standard, click Cancel. This softkey does not cancel the current calibration. To disable the current calibration, turn off the error correction function (See Error Correction Disabling). |
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The calibration status can be checked in channel status bar (See General error correction status table) or in trace status field (See Trace error correction status table). |
