Why is it Necessary to Calibrate a VNA?

Calibration corrects certain errors within the VNA and those added by connectors and test cables. If test cables are being used, establishing a reference plane at the ends of the test cables is crucial, such that delay and phase measurements apply only to the Device Under Test (DUT) and not the DUT plus cables. All VNAs from Copper Mountain Technologies are factory calibrated to the output connectors of the equipment, so rough measurements can always be made without user calibration. It is sometimes helpful to attach the DUT to the VNA, then adjust the frequency range and number of points before performing calibration.

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