Model DMM7510 7½ Digit Multimeter User's Manual
Section 10: Capturing and analyzing waveforms
DMM7510-900-01 Rev. B / May 2015
10-7
Send the following commands:
--Reset the instrument to default settings.
reset()
--Create a local variable to store the number of samples
numofsamples = 100
--Set the measure function to digitize voltage to capture the ripple waveform
dmm.digitize.func = dmm.FUNC_DIGITIZE_VOLTAGE
--Voltage range must be fixed when using digitize voltage
dmm.digitize.range = 10
--Set sample rate to 1 Msample per second to sample a 50 kHz voltage ripple
dmm.digitize.samplerate = 1e6
--Set aperture to auto to get the highest accuracy measurement for the configured
sampling rate
dmm.digitize.aperture = dmm.APERTURE_AUTO
--Set sample count to the number of samples to capture about 5 ripples
dmm.digitize.count = numofsamples
--Set the input impedance to auto so it selects 10 G for the 10V range
dmm.digitize.inputimpedance = dmm.IMPEDANCE_AUTO
--Set the buffer to align with the number of samples (optional)
defbuffer1.capacity = numofsamples
--Clear buffer
defbuffer1.clear()
--Make sure your signal is connected to the DMM. Digitize now.
dmm.digitize.read()
--Print the digitized readings
if defbuffer1.n > 0 then
print("Ripple Voltage:")
print("Total Count:", defbuffer1.n)
printbuffer(1, defbuffer1.n, defbuffer1)
print("Timestamps:")
printbuffer(1, defbuffer1.n, defbuffer1.relativetimestamps)
else
print("No data collected")
end
print("Test Ended")
Duty cycle from switch node voltage
The switching duty cycle determines the voltage at the output compared to the input voltage, as
shown in the following equation:
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