10: Capturing and analyzing waveforms Model DMM7510 7½ Digit Multimeter
10-8 DMM7510-900-01 Rev. C / September 2019
For this test, you will:
• Connect the 3 Ω load resistor to the output terminals of the buck converter
• Connect one test lead to the switch node voltage of the buck converter
• Connect another test lead to the ground of the buck converter
• Supply 12 V of input voltage to the input terminals of the buck converter
• Reset the instrument
• Select the digitize voltage function and set sample rate to 1 megasample per second with a
sample count of 100
• View the data on the Graph screen
• Turn on vertical horizontal cursors to calculate the duty cycle percentage
Device connections
The connections for the duty cycle test are shown in the figure below.
Figure 39: Duty cycle device connections
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