5.
Set the differential amplifier to multiply by ten, divide by one, and 1 MΩ input resistance. Set the dif-
ferential amplifier's positive and negative inputs to AC coupling. Set the oscilloscope’s time base to 5
ms/div, and the vertical scale to 10 mV/div. Turn the bandwidth limit on (usually 20 or 30 MHz), and
set the sampling mode to peak detect.
6.
Program the power supply to the settings indicated in the in the test record form for the appropriate
model under “CV Ripple and Noise” see the Test Record Forms under Test Description of “CV Ripple
and Noise” for details and enable the output. Let the oscilloscope run for a few seconds to generate
enough measurement points. On the Keysight Infiniium oscilloscope, the maximum peak-to-peak
voltage measurement is indicated at the bottom of the screen on the right side. Divide this value by
10 to get the CV peak-to-peak noise measurement. The result should not exceed the peak-to-peak
upper limits for instrument's “CV Ripple and Noise, peak-to-peak.” See the Test Record Forms
under “CV Ripple and Noise” for details.
7.
Disconnect the oscilloscope and connect an rms voltmeter in its place. Do not disconnect the 50 Ω
termination. Divide the reading of the rms voltmeter by 10. The result should not exceed the rms lim-
its in the test record form for the appropriate model under “CV Ripple and Noise, rms”. See the Test
Record Forms under “CV Ripple and Noise” for details.
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