This gets a bit more complicated for FCC regulations on emissions above
1 GHz, where the prescribed detector is an average detector (at 1 MHz
RBW) and the peak limit is defined as 20 dB above that.
On 4/5/2024 7:19 PM, Brent DeWitt wrote:
That is what I expected you meant, but a bit confusing based on the
original topic. You are certainly correct with respect to conducted
emissions!
On 4/5/2024 7:14 PM, [email protected] wrote:
I was thinking conducted emissions in the context of average detectors.
*From:*Brent DeWitt <[email protected]>
*Sent:* Friday, April 5, 2024 3:48 PM
*To:* [email protected]; [email protected]
*Subject:* Re: [PSES] Radiated Emissions - How many points to QP?
Could you clarify when you would choose to use an average detector
for radiated 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
<[email protected]>
<mailto:[email protected]>
*Sent:* Friday, April 5, 2024 12:33 PM
*To:* [email protected]
*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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