Hi EMC Gurus,
I have been struggling with something for a while and have decided that
this
is the best place to send my question:
I would like to better understand how quasi-peak is determined on a
single
pulse of specified duration. From my understanding, Quasi-peak applies an RC
time constant to the pulse. If the pulse length equals 5 times the RC time
constant, then the QP measurement will be roughly 99% of the peak measurement.
According to CISPR-16-1 Table 1, the charging time constant specified
is 1
ms. Therefore, according to my understanding, QP should be 99% of peak
measurement at 5ms.
However, my experiments have given very different results. I have an
HP8593E
spectrum analyzer. In an effort to prove my understanding of CISPR-16-1's
definition of Quasi-peak, I applied a 1 second 900 MHz pulse to the spectrum
analyzer with QP detection on. This 1 second pulse was applied using the
pulse trigger of a Marconi 2024 sig gen. To my surprise, QP did not equal
peak until about 500ms.
Does anyone know why I am getting such different results than what I had
predicted?
I have data and analyzer pics if anyone thinks that they would help. I
have
been told that attachments are not good for list servers, so please let me
know if you would like to see them.
Regards,
Drew Rosenberg
Regulatory Engineer
Itron, Inc.
2401 North State Street
PO Box 1735
Waseca, MN 56093
Tel 507-837-5264
Fax 507-837-5200
[email protected]
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