Vector network analyzer
The VNA 2180 measures impedance (magnitude and phase) and filter transmission in the range of 5kHz to 180MHz. A PC is used to plot parameters, such as impedance, SWR, S11 and S21. The test frequency is generated digitally. A 12-bit analog-to-digital converter digitizes the raw data. This avoids non-linearity associated with diode detectors, and results in very good dynamic range and linearity for accurate magnitude and phase measurements.
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