ABSTRACT
This chapter outlines the basic approaches required to perform essential measurements by means of a special test set which can be easily made by the reader. The primary purpose of the test set is to provide a means of adjusting ac and dc levels and injecting ac signals into the power converter under test at a power level consistent with the maximum output power to be delivered by the converter. The output impedance of the converter at any frequency is obtainable by varying the frequency of the ac signal source. The chapter describes a method of loop gain measurement of a converter. To ensure stable operation and to check for design discrepancies, it is essential to perform measurements on the gain and phase of the power converter. One method of performing this measurement is to inject a small ac signal into the feedback loop at a suitable location and measure the closed-loop gain of the converter.
