Re: [PSES] Quasipeak definition

Mon, 31 Jul 2017 19:21:19 -0700

Brent,

At a company we both know, I wandered into the lab and saw some engineers trying to do a near-field UHF susceptibility test with a small loop antenna.

I asked them if they had the right signal generator.  They did.  I asked them if they had the right amplifier.  "Sure," they said, "It had coaxial connectors."

"Why are the meters labeled VU?"  I asked.


Cortland
-----Original Message-----
From: Brent DeWitt
Sent: Jul 31, 2017 8:21 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Quasipeak definition

Before even my time, but I was told that it was modeled after the classic “VU” meter used in sound recording, and for the same reason that Ghery mentions below.

 

Brent DeWitt, AB1LF

Milford, MA

 

From: Ghery S. Pettit [mailto:n6...@comcast.net]
Sent: Monday, July 31, 2017 2:16 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Quasipeak definition

 

The QP detector was designed in the 1930s to simulate the response of the human ear to impulsive interference.  The classic example at the time was the interference from ignition systems in automobiles to AM broadcast receivers, both in the car and nearby.  A single click is well filtered by the ear and brain, but as the repetition rate goes up the perceived annoyance and interference goes up.  By the time the repetition rate has reached 10 kHz the ear/brain combination is really annoyed and the quasi-peak detector and a peak detector respond about the same.

 

Hope this helps.

 

Ghery S. Pettit

 

 

From: Paasche, Dieter [mailto:dieter.paas...@christiedigital.com]
Sent: Monday, July 31, 2017 7:35 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Quasipeak definition

 

How would you define the Quasipeak detector to somebody that is not EMC knowledgeable.

 

 

Sincerely,

 

Dieter Paasche

Senior Product Developer, Electrical

CHRISTIE

809 Wellington Street North

Kitchener, ON N2G 4Y7

Phone: 519-744-8005 ext.7211

www.christiedigital.com

 

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