Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1285
| Posted: 10:53am 27 Mar 2025 |
In my early days of noise chasing I quickly determined that sometimes the noise is not having any effect as it may be common to the ground and supply lines and everything in between.
This is especially true when very fast rising and falling current levels are being switched as in your inverter, and being monitored with a CRO. Sometimes you can end up spending a lot of time chasing shadows.
To determine if this may be what you are experiencing, connect the probe earth clip to the probe tip and touch the (now grounded) tip to the chassis or the ground wire of the inverter whilst it is running. (The supply rail can be monitored too but use a 10 nano ceramic in series with the grounded probe tip).
You may need to experiment with the trigger level to see the "noise" in question.
Whilst intuitively the noise may appear to be the issue do treat everything else as suspect too - until proven innocent. I agree with KeepIS the waveforms looked typical to me, I was going to ask how you got it so quiet
Edited 2025-03-27 20:56 by wiseguy