7½ Digit Multimeter User's Manual Section 10:
Capturing and analyzing waveforms
DMM7510-900-01 Rev. C / September 2019 10-11
Using SCPI or TSP commands
Use the command sequence for the ripple noise on the output voltage test to acquire the switching
voltage waveform. Refer to Ripple noise on the output voltage (on page 10-4
).
Inductor current linearity with varying load
The inductor current is expected to be a linear triangular waveform with varying amplitude, depending
on the loading at the output terminals. The current increases linearly when energy is stored into the
inductor and decreases when energy discharges from the inductor. Any nonlinearity in the slope of
the triangle waveform indicates inductor saturation, which is likely caused by overloading the output.
For this test, you:
• Connect the 3 Ω load resistor to the output terminals of the buck converter
• Connect test leads to the output terminals of the buck converter
• Supply 12 V to the input terminals of the buck converter
• Reset the instrument
• Select the digitize current function and set sample rate to 500 kilosamples per second
• Set sample count to 50
• Display the graph
• Repeat these steps with 4 Ω and 8 Ω resistive loads to see the change in the inductor current
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