generally, 2 limits, QP and P which is 20 db above QP. Gotta meet both.
Unless the P is so infrequent as to call it a Click. Which I would not to want
a challenge over.
On Friday, April 5, 2024 at 03:53:43 PM EDT, Stultz, Mark
<[email protected]> wrote:
Hi Larry,
I agree with you completely…I think the lab didn’t see that peak going over the
limit line and therefore didn’t QP. We only noticed now that they have sent
the report several weeks later. They’re arguing that there is no need to
retest.
Thanks,
Mark
From: Larry K. Stillings <[email protected]>
Sent: Friday, April 5, 2024 3:46 PM
To: Stultz, Mark <[email protected]>; [email protected]
Subject: RE: Radiated Emissions - How many points to QP?
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Mark,
If the peak is above the limit (which most standards allow up to 20 dB), then
wouldn’t you also need to know the quasi-peak of all the signals above the
limit so you could compare them to the limit? The limit is in QP not peak.
I guess failing is failing, but you really wouldn’t know by how much.
Is it really that much more work to take a QP, or maybe the automation software
doesn’t support that? We’re old school and still take the data manually and I
have the guys always take both (peak and quasi-peak).
Larry K. Stillings
Compliance Worldwide, Inc.
Test Locally, Sell Globally and Launch Your Products Around the World!
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From: Stultz, Mark
Sent: Friday, April 05, 2024 3:33 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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