That would be 61000-3-2; 61000-3-3- is about power-supply voltage
fluctuations due to input current fluctuations.
Is that QP data from radiated emissions? Can you look at the waveform
to see if you can identify the cause of (what you appear to be reporting
as) the broadband emission between 168 kHz and 1 MHz? A good 100 kHz
high-pass filter may be needed.
On 2025-08-27 22:33, Brian Gregory wrote:
Ralph noted:
> For the Method yes, but as John Woodgate pointed out, you need
another CISPR or
> EN standard to defined limits.
They used IEC 61000-3-3 Cl. B for the conducted emissions.
On top of that, the QP data we saw showed a smooth line from (~ 90dBuV
at 168 kHz "corrected"), on a linear slope down to ~ 1MHz, whereupon
the data started looking like a typical EMC plot; jagged lines with
some peaks. The first peak was at 2MHz. Both me and the Engr VP
looked at the plot on a big screen, and said ... WTF?
The Averaged data showed only very small squiggles with the same
slope, starting at 58.6dBuV at 170 kHz "corrected" and started showing
regular sized peaks and bumps at about 2 Mz.
These are the weirdest test results I've seen; but I have no where
the experience as most of you. We're meeting again with the customer
this afternoon, and I'm still poorly informed on:
What is the hazard or risk?
Colorado Brian
Please note: message attached
From: Ralph McDiarmid <[email protected]>
To: [email protected]
Subject: Re: [PSES] Hazards, risks with EMC emissions?
Date: Tue, 26 Aug 2025 13:34:20 -0700
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