Section 7: Capturing and analyzing waveforms
Model DMM7510 7½ Digit Multimeter Application Manual
7-16
DMM7510-904-01 Rev. D March 2021
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 cables with banana plugs.
Connect the test leads as shown in the following figure.
