ES User’s Guide 6-7Calibrating for Increased Measurement AccuracyMeasurement Calibration OverviewThe Calibration Reference PlaneMost often you will not be connecting your DUT directly to theanalyzer's front panel. More likely, you will be connecting your DUT tosome sort of test fixture or cable(s) that is connected to the analyzer. SeeFigure 6-3, “The Calibration Reference Plane.” The calibration referenceplane is where you connect your calibration standards, and themeasurement reference plane is where you connect your DUT. Bestmeasurement results occur when these reference planes are aligned sothat you calibrate out the effects of the test fixture and its associatedcables and hardware. Figure 6-3 illustrates that one method of aligningthe reference planes is to connect your calibration standards at the samepoint that you connect your DUT. For information on selectingcalibration standards, refer to “Calibration Kits” on page 6-23. A lessaccurate method is to connect the calibration standards to the analyzer’sports and then use the port extensions feature, previously explained inChapter 5.Figure 6-3 The Calibration Reference Plane
