On Sat, Apr 5, 2025 at 07:21 AM, Jay Czaja wrote:
What is the best way to measure ripple on the LV supply.
It may not be the BEST way, but the quick and simple way is to use the same handheld DVM that you use to measure the DC voltage. Just switch your DVM from DC to AC and you will get a very good idea of the ripple. In most cases, you're not looking for the difference between 2 mV and 5 mV; you're looking for the difference between 2 mv and 2 V.
This is probably not useful for most switching supplies, since most DVMs don't go much above a few kHz on AC, but it has the advantage that you're already connected to the test points you're interested in, you automatically get a floating measurement, and it tells you whether you need to look into this more carefully or not.
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Jim Adney
Madison, WI USA
