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The primary measurement tool used to test and characterize power supplies is an oscilloscope. Many of today’s scopes, including the Keysight Technologies, Inc. InfiniiVision X-Series, offer special power measurement options that can help automate many of the most important measurements. Figure 1 shows a list of the power supply characterization measurements that are available on Keysight’s InfiniiVision 3000T, 4000, and 6000 X-Series oscilloscopes with the power measurements option (DSOX3PWR, DSOX4PWR, DSOX6PWR). Unique to Keysight’s portfolio of measurements are frequency response measurements including control loop response (Bode) and power supply rejection ratio (PSRR). These particular stimulusresponse type measurements are typically performed using low-frequency network analyzers. But since Keysight’s InfiniiVision X-Series oscilloscopes come with a built-in function/arbitrary waveform generator, they can also be performed using these scopes.
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