Re: [PSES] Quasipeak definition

The difference between resolution and accuracy is pretty intuitive to those (old farts) who have lived through the transition from analog meters and slide rules to digital meters and calculators. It is an important differentiation to be passed on to folks who haven’t thought about it.

Re: [PSES] Quasipeak definition

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

Re: [PSES] Quasipeak definition

https://www.amazon.com/Tekpower-TP188-Pocket-size-Analog-Multimeter/dp/B00064CH6AEh?I got some, old and recent, and I used them once to show  folks it was their 14-digit $XX,000, buss-controlled remote multimeter that had them (planless and clueless) testing everything in sight for WEEKS.Cortland

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:

Re: [PSES] Quasipeak definition

Sounds like you'll need to measure with an old analog meter to go with it. -Dave From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, July 31, 2017 3:40 PM To: Nyffenegger, Dave; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Quasipeak definition I have a Classic 1948 John Deere "M"

Re: [PSES] Quasipeak definition

Precisely ­ the inertia of the moving coil technology should be enough to yield a steady reading, and of course there is no rf detection going on. But make sure you don¹t cheat and use one with built-in rectification. Any such junction can detect rf. Ken Javor Phone: (256) 650-5261 From: john

Re: [PSES] Quasipeak definition

"Horses for courses," then! J From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: 31 July 2017 21:08 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Quasipeak definition Use a voltmeter of the type they used back when they designed that tractor, and you will be just fine.

Re: [PSES] Quasipeak definition

The DMM should have better immunity, I suggest. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: 31

Re: [PSES] Quasipeak definition

Use a voltmeter of the type they used back when they designed that tractor, and you will be just fine. Ken Javor Phone: (256) 650-5261 From: "Kunde, Brian" Reply-To: "Kunde, Brian" Date: Mon, 31 Jul 2017 19:39:30 + To:

Re: [PSES] Quasipeak definition

I have a Classic 1948 John Deere "M" tractor. I cannot measure the battery voltage (to see if the generator is charging the battery) while the engine is running because the emissions from the ignition is so bad it causes by DMM to malfunction. The Other Brian From: Nyffenegger, Dave

Re: [PSES] Quasipeak definition

As an integrator perhaps..? From: Paasche, Dieter [mailto:dieter.paas...@christiedigital.com] Sent: Monday, July 31, 2017 8:35 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Quasipeak definition This message originated outside of DISH and was sent by:

Re: [PSES] Quasipeak definition

Yeah, I have to fix the ignition in my '69 right now. Maybe I'll replace the condenser while I'm at it. -Dave From: Ghery S. Pettit [mailto:n6...@comcast.net] Sent: Monday, July 31, 2017 2:39 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Quasipeak definition True enough, but there are

Re: [PSES] Quasipeak definition

True enough, but there are still automobiles out there with old, noisy, ignition systems. Heard an old VW Beetle go by lately? And to think, someone built an OATS near a freeway years ago. What were they thinking? Fortunately, the ignition system in the plane I'm flying to dinner later this

Re: [PSES] Quasipeak definition

Do we have any products these days that produce such emissions? I'm not sure that a 10 kHz repetition rate ever occurred anyway. For an ignition system, 3000 RPM and 4 four-stroke cylinders only gives 600 Hz. With best wishes DESIGN IT IN! OOO - Own Opinions Only

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

Re: [PSES] Quasipeak definition

Dieter, Peak detection is like the barn door is wide open into the analyzer. QP detection is like the small door in the barn door is the only part open. Thanks, Michael Sundstrom Garmin Compliance Engineer 2-2606 (913) 440-1540 KB5UKT "We call it theory when we know much about something but

Re: [PSES] Quasipeak definition

I like that definition. By the way, according to Don White Consultants Inc., in their 1976 book on EMI, "The quasi-peak detector is a carryover of the EMC instrumentation in use many years ago. At that time, most of the potential EMC victims were AM broadcast receivers and potential EMI

Re: [PSES] Flicker from LED and CFL light bulbs

Hi Ken, The Daily Mail isn't renowned for scientific rigor. Or journalistic rigor. Or rigor for that matter ;-) Nevertheless, here's a link to the article that they reference - http://theconversation.com/the-scientific-reason-you-dont-like-led-bulbs-and -the-simple-way-to-fix-them-81639.

Re: [PSES] Quasipeak definition

You could go back to the basics and explain that it was a mechanism to quantify impulse type noise perceptible to the human ear, or something along those lines. MOST people can relate to that. Good Luck Jerry From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Monday, July 31, 2017

Re: [PSES] Flicker from LED and CFL light bulbs

Bill et al, Thanx; good tribal knowledge from this group. I’m an old CRT guy, but not the TV type; scope displays didn’t have to deal with these lighting interference issues. But I have seen other unexpected consequences from the ongoing development of

Re: [PSES] Quasipeak definition

The slow decay was more intended to make the meter easier to read. There have been some other colourful explanations, but I think that’s the simplest. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates

Re: [PSES] Quasipeak definition

As I understand it differs from the peak and average in that it is a quick detect and slow decay.  The purpose was to emulate electronic devices that are sensitive to this sort of response.  As such, we use to peak to detect potential interference and then a combination of average and QP for

Re: [PSES] Quasipeak definition

It's a peak detector that has a carefully-controlled time-response that is not quite fast enough to show the true peak value of a very fast transient that might occur. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and

[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