10: Capturing and analyzing waveforms Model DMM7510 7½ Digit Multimeter
10-16 DMM7510-900-01 Rev. C / September 2019
Power-up behavior
You can use the DMM7510 to capture the start-up behavior of the buck converter. The start-up
inspection can ensure that the device turns on in a reasonable amount of time without any
unexpected glitches or pulses. You can capture the asynchronous power-up event by using the
analog trigger feature on the DMM7510.
For this test, you:
• Connect the 4 Ω load resistor to the output terminals of the buck converter
• Connect test leads to the output terminals of the buck converter
• Reset the instrument
• Select the digitize voltage function and set the sample rate to 1 megasample per second
• Set sample count to 10,000 to monitor the power-up event for 10 ms
• On the front panel of the instrument, open the Graph screen and set the graph scale option
X-Axis Method to All
• Set up the edge trigger level and position
• Run the trigger model to capture the voltage waveform
• Turn on 12 V of input voltage to the input terminals of the buck converter
Device connections
You can use either the front or rear inputs. Ensure that the front-panel TERMINALS switch is set
correctly (F displayed for front; R displayed for rear). Note that you must use either the front terminals
or rear terminals. You cannot mix connections.
Both front-panel and rear-panel connections are safety banana jacks. You can make these
connections with two insulated banana cables (for example, the leads included with the Keithley
Instruments Model 1756 General Purpose Test Lead Kit).
Connect the test leads as shown in the following figure.
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