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SDS5000X Series Digital Oscilloscope User Manual
Note: low current value and high current value are used to calculate trigger
level and adjust the oscilloscope vertical scale. After the load changes, the
current value changes from low to high (or from high to low), and the
oscilloscope triggers and performs to measure the transient response stability
time.
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.
27.11 PSRR
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 generation 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
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