Why Warm Up a VNA before Use?

Engineers regularly face difficult deadlines. In a rush to complete a series of measurements, it is tempting to take a piece of test gear off the shelf, plug it in, and begin the process. Resist the urge! Here, we’ll look at how a typical Vector Network Analyzer (VNA) measurement can change from initial power-up to thermal equilibrium. Note, we are only examining warm-up characteristics, not ambient temperature changes, which can not only affect the VNA but the coaxial test cables as well.

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