U1882B Datasheet, PDF (6/11 Pages) Keysight Technologies – Measurement Application for InfiniiVision

06 | Keysight | U1881A and U1882B Measurement Application for InfiniiVision and Infiniium Oscilloscopes - Data Sheet
Modulation analysis
Modulation analysis allows you to quickly see the on-time and
off-time information of the PWM signal, which is difficult to
visualize because the information bandwidth is much lower than
the pulse switching frequency. Plotting the embedded variation
of on time or off time in the PWM signal over a long period of
time can reveal the control loop response of the feedback loop
system. This measurement performs data trending on the
switching variation of the acquired waveform in the following
formats:
–– Frequency versus time
–– Period versus time
–– Duty cycle versus time
–– Positive pulse width versus time
Output analysis
Figure 6. Modulation analysis results
This module includes characterizing the ripple (either AC or
switching) component in the output DC voltage. Ripple is the
residual AC component that is superimposed on the DC output
of a power supply. Line frequency and switching frequency can
contribute to the ripple. This measurement presents the peak‑to-
peak ripple value as well as the frequency response of the
captured signal.
Figure 7. Output analysis results