Re: [PSES] Radiated Emissions - How many points to QP?

Brent DeWitt Fri, 05 Apr 2024 16:19:52 -0700

That is what I expected you meant, but a bit confusing based on theoriginal topic. You are certainly correct with respect to conductedemissions!


On 4/5/2024 7:14 PM, rmm.priv...@gmail.com wrote:


I was thinking conducted emissions in the context of average detectors.

*From:*Brent DeWitt <bdew...@ix.netcom.com>
*Sent:* Friday, April 5, 2024 3:48 PM
*To:* rmm.priv...@gmail.com; EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* Re: [PSES] Radiated Emissions - How many points to QP?

Could you clarify when you would choose to use an average detector forradiated emissions between 30 and 1000 MHz?


On 4/5/2024 6:39 PM, Ralph McDiarmid wrote:

    I’m having trouble with /“Of those disturbances above (L-20dB),
    where L is the limit level in logarithmic units, the disturbance
    levels and the frequencies of at least the six highest
    disturbances shall be recorded.”/

    //

    Does this CISPR measurement methods standard expect you to record
    the six highest signals which are less than or equal to -20dB wrt
    the *average limit* when using an*average detector *and the*QP
    limit *when using a*QP detector*? Perhaps that is made clear in
    the product-specific standard (like EN55022 or CISPR 11, etc)

    Comments?

    //

    /Ralph/

    *From:*Stultz, Mark
    <00000f79f2e10e47-dmarc-requ...@listserv.ieee.org>
    <mailto:00000f79f2e10e47-dmarc-requ...@listserv.ieee.org>
    *Sent:* Friday, April 5, 2024 12:33 PM
    *To:* EMC-PSTC@LISTSERV.IEEE.ORG
    *Subject:* [PSES] Radiated Emissions - How many points to QP?

    Hello PSES brain trust,

    When doing radiated emissions measurements, how many frequencies
    should be quasi-peaked?

    CISPR 16-2-3 clause 6.4.9 states:

    /“Of those disturbances above (L-20dB), where L is the limit level
    in logarithmic units, the disturbance levels and the frequencies
    of at least the six highest disturbances shall be recorded.”/

    We have always done QP measurements on all peak measurements above
    the limit, even if that is more than six points.

    I have a lab arguing that they only need to measure the top six,
    regardless of how many peak measurements are above the limit.

    Any thoughts are appreciated.

    Thanks,

    Mark

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Re: [PSES] Radiated Emissions - How many points to QP?

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