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The power supply rejection ratio (PSRR) test is used to determine how the regulator
suppresses ripple noise in different frequency ranges. The oscilloscope controls the
arbitrary waveform/function generator to output a sweep signal, which is used to
introduce ripple into the DC voltage transmitted to the voltage regulator. Measure the AC
RMS ratio of input to output, and plot the relationship between the ratio and frequency.
The background noise of the oscilloscope is higher than that of the network analyzer,
and the sensitivity is lower than that of the network analyzer, so the PSRR measured by
the oscilloscope is difficult to exceed -60 dB. The PSRR test is generally acceptable for
sampling the overall PSRR behavior of the power supply under test.
The configuration of PSRR is the same as that of the bode plot, see the chapter " Bode
Plot" for details.
Connection Guide
Touch Signal>Connection Guide to recall the connection guide of PSRR, as shown in
the figure below. Please follow the instructions in this figure for connection. Touch the icon
on the top right of the guide to close.
25.12 Power Efficiency
Power efficiency analysis can test the overall efficiency of the power supply by
measuring the output power and input power. This analysis is only supported on 4-
channel models because all of the input voltage, input current, output voltage, and
output current are necessary for the measurement.
Connection Guide
Touch Signal>Connection Guide to recall the connection guide of power efficiency, as
shown in the figure below. Please follow the instructions in this figure for connection.
Touch the icon on the top right of the guide to close.
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T3DSO2000A Manual. Page 161
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