Thanks guys.
I checked out the actual case yesterday and was told that the reason for
observing QP for a longer time was that the product had used a spread
spectrum technique.
Best regards Amund
Fra: Paasche, Dieter
Sendt: 6. desember 2021 16:35
Til: EMC-PSTC@LISTSERV.IEEE.ORG; Amund Westin <am...@westin-emission.no>
Emne: RE: [PSES] Max Hold Quasi-peak ?
Hi,
I agree with the statements mentioned. It depends on the nature of the
disturbance and you would have to find out what is happening during that
period of time. I would also suggest to review CISPR 16-2-1, specifically to
the definition of continuous disturbance.
Section 3 continuous disturbance
RF disturbance with a duration of more than 200 ms at the IF-output of a
measuring receiver,
which causes a deflection on the meter of a measuring receiver in quasi-peak
detection mode
which does not decrease immediately
Section 6.5 Interpretation of measuring results.
6.5 Interpretation of measuring results
6.5.1 Continuous disturbance
The following steps shall be applied when interpreting the results for
continuous disturbance
measurements:
a) At each frequency for which the level of disturbance is close to the
limit and not steady,
the reading on the measuring receiver is observed for at least 15 s for each
measurement;
the highest readings shall be recorded. Some product standards allow the
exclusion of
isolated clicks, which shall be ignored (e.g. CISPR 14-1).
There are more conditions in this sections.
Sincerely,
Dieter Paasche
Senior Product Developer
Electrical / EMC Compliance
<mailto:dieter.paas...@christedigital.com>
dieter.paas...@christedigital.com
Work: (519) 744-8005 Ext. 7211
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From: Charles Grasso <charles.gra...@dish.com
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Sent: Monday, December 06, 2021 10:08 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] Max Hold Quasi-peak ?
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Interesting topic!
Completely agree with Brent!.
I would only add the "quality" of the signal can also contribute to the
variation - by that I mean if there
is any kind of modulation on the signal then that will contribute to the
measurement difficulties.
It is also not unusual for a lab to sit on a signal if the signal has a
noted time variance
(this is from experience).
On Sun, Dec 5, 2021 at 11:46 AM Amund Westin < wrote:
This message originated outside of DISH and was sent by:
owner-emc-p...@listserv.ieee.org <mailto:owner-emc-p...@listserv.ieee.org>
Some weeks ago I went to a test lab as an observer on a CE marking project
(IT product).
I participated on the radiated emission testing and some frequencies were
above the limit line during the scan (peak measurement). Later on, the
Quasi-Peak measurement lowered the values significant and therefore with the
result Passed.
Later on, I was told that they continued the testing by 10-15 minutes and
was logging the maximum Quasi Peak value (repetitive QP meas) on spike with
the highest value. During these 15 minutes, one or two QP measurement was
above the limit and the result was changed from Passed to Failed.
I have not seen this test procedure before. I'm familiar with just one QP
measurement on each frequency and not Max Hold QP on each for 10-15 minutes.
Anyone who have experienced the same? Is it a CISPR procedure or just some
overzealous lab engineers?
Best regards
Amund
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