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Connection Guide
Touch Signal>Connection Guide to recall the connection guide of transient response,
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.
25.11 PSRR
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
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T3DSO2000A Manual. Page 160
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