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SDS2000X HD Series Digital Oscilloscope User Manual
2 4 4 i n t . s i g l e n t . c o m
Note: The low and high current values are used to calculate the 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.
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 connection. Touch the icon on the top
right of the guide to close.
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