The accurate volume is about 1/3 by 1/3 of the outside dimensions. At least
that's my measured experience.
Just means one has to make a rather large Helmholtz for a large sensing
coil. And my recollection of most sensing coils in that range are that
they're over 1/2 meter in diameter. I've
Actually, most meters average the waveform, then apply a rote formula
converting that average to an rms reading which is more likely to err on the
side of too low a reading.
For a square wave it will read too high by 6% (actually worked this out, but
forgot the actual number, but you have the
We made a probe using rigid coax with its built in SMA connector. Solder a
pin to the side of the coax and file it diagonally to create a sharp point.
To increase the loading impedance we used an SMA collar that had been
filed out to place a series chip resistor of 470 ohms in series with the
Uh, isn't the national language of Argentina Spanish? Not Portuguese.
The web sites may still not be helpful, but at least aren't they in Spanish?
- Robert -
-Original Message-
From: George Sparacino george.sparac...@bostonacoustics.com
To:
Does anyone know labs set up to measure mobile phone ancillary equipment?
located in northern California area? Specifically Silicon Valley, San Jose
area.
Just need to test for radiated susceptibility at 3 V/m of a hands free
headset equipment when attached to a cell phone.
Yes, any chamber
Guessing the best place to look would be in the electronic detonator
requirements. They must have some really stringent compliance requirements
to prevent mishaps.
- Robert -
-Original Message-
From: pgodf...@icomply.com pgodf...@icomply.com
To:
Ron,
Interferernece? You need to find out about the specs for others then.
That frequency band is allocated for microwave ovens, which obviously have
lots of power.
Watch out in a metropolitan area around lunch time when all the restaruant
and office microwaves start operating, you'll see
Many things to cover:
Mechanism for approval process over a distributed area.
Coordination of notification over a distributed area.
Is this a true ECN, or do you still need approvals? If you need approvals,
you might end up getting a change to your ECN Therefore, you'll need to
split the
Not sure where to look.
But it is my understanding that the frequency of an impulse stimuli can
lock a person's alpha brain wave inducing trance-like states. Guess at
around the 5Hz to 10Hz range.
In particularly susceptible people, certain pulsating frequencies can induce
epileptic seizures.
I've got a copy of DimStrip which calculates their characteristics. Either
electrical properties from dimensions, or dimensions from required
electrical characteristics for stripline, or microstrip.
Runs under DOS and also has adjacent line capability.
Is there a place I can post it so people
Of interest, so I forward this to the group:
- Robert -
Robert A. Macy, PEm...@california.com
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San Jose, CA 95112
-Original
Ditto,
robertm...@aol.com
-Original Message-
From: Davis, Mike mike_da...@adc.com
To: 'cdup...@cs.com' cdup...@cs.com; rl...@tectrol.com
rl...@tectrol.com; emc-p...@ieee.org emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Monday, March 13, 2000 8:38 AM
Subject: RE: EMC
Derek,
The horn antenna is an impedance matching device for getting between 50 ohm
lines and 377 ohm free space while launching TEM mode wave fronts.
You could use the commercially available one which has an awful antenna
factor. It's broadband as a result of the ribs placed in the horn.
Just
Keith,
Without looking at the specifics. Disruption from a discharge can be caused
by direct high voltage gradients, localized breakdown which then applies
direct high voltage, and the often forgotten current injection where the
discharge makes enough current flow that the flow induces a
Wouldn't BABT have such a facility, too?
- Robert -
-Original Message-
From: Jim Bacher jim_bac...@mail.monarch.com
To: emc-p...@ieee.org emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, March 02, 2000 3:51 PM
Subject: Fwd:Re: UL 891
Jose,
I've seen software go by on
sci.engr.electrical.compliance
newsgroup.
I think more depth is discussed here than there, though.
You might take a look at Douglas Smith's web site
www.dsmith.org
Or Charles Grasso's web site:
, especially if the peak is just starting near 30MHz.
-Original Message-
From: Gert Gremmen cet...@cetest.nl
To: Robert Macy m...@global.california.com; Muriel Bittencourt de Liz
mur...@grucad.ufsc.br; Lista de EMC da IEEE emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date
Muriel,
Without a ground plane you will not have the necessary parasitic
capacitance to the body of your EUT. It is this third path that often
causes failures up passed 1 MHz.
Definitely if you do your test in a proper setup versus a chamber you will
see differences in the 20MHz to 30MHz
Gert,
The connection (Wire A) the ground connection from the EUT to the ground
plane is indeed quite long and inductive and does not exist However, the
three wires HOT, Neutral, and GND form a 3 winding transformer which has a
core impedance in the range of 7uH for a six foot length of Belden
Do SDL modems need to meet all the part 68 specs? Or can they violate just
a little (and where) and obtain a waiver, but still be certified?
- Robert -
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to
to
be used for mapping electrical brain activity. And those specs are going to
make a chamber look like a sieve.
-Original Message-
From: Robert Tims (EMX) emxrt...@am1.ericsson.se
To: 'Robert Macy' m...@california.com
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, January 25, 2000 9:40
Are fields stronger there?
The geologic survey people should have those numbers.
In California the fields are about 50microT which is pretty insignificant.
If you took a loop of wire that was 1 sq meter area and flopped it over in
the earth's field you'd have to do it within half a second even
At first that looked like what is asked for is the ability to pass signals
with a bandwidth of 10Hz. Given what they're looking for, stating frequency
would make it easier to understand.
But isn't the risetime 1/2pi F??
Or, are they just saying that the readings pop out at least 10 times per
Here are a set of rules worth recommending:
Engineering design checks:
1 Avoid spaghetti logic block diagram. Make certain there's a good flow
of functionality across and around the PCB. This includes using the concept
of transferring INFORMATION not ENERGY (except where one must, like with
Just my $.02 worth
It seems the problem is that willy-nilly use of lead in products leads to
the undesirable effect of lead migrating into the environment.
However, lead acid batteries are not banned, because there is strict
recycling.
Hmmm put those two together and the problem is
Yes, we were applying the discharges too rapidly. Faster than 1 per 10
seconds did not allow adequate discharge. faster than 1 per 60 seconds
still did not allow adequate discharge.
So that's 10 minutes a discharge pointand still the test was not
adequate for the intent of the test.
True.
Same experience.
To legitimize the test we had to discharge the case/structure between
discharges.
Or, to really aggravate the test, we went from - to + to - to + which often
caused a failure.
But the point to test at all voltage levels is well made. The discharge
wavefront (and
My opinion based upon working with 20KV, 200KV:
You need to have the outer shroud rated for 4KV also.
First, suppose the lamp doesn't strike? Then the 4KV is there a long time.
Second, insulation is a tricky thing. Its ability to hold off voltage
doesn't add, unless the materials are *very*
In my notes from university (when cps was prevalent) I see that originally
kcps was written and even mcps (handwriting was terrible hard to tell
whether the m was capital or not, the m for millivolts was always written
mV), then when the change to Hertz came about (that probably should be
hertz)
Ken,
Rule of thumb which hopefully is accurate:
MOV's have a discrete lifetime (like 10 cycles at full rating) before
they're gone.
In order of joules absorbed versus package size:
Glass tubes, MOV's, silicon (from huskiest to weakest)
For turn on time:
silicon, MOV's, glass tubes (from
David,
Measured 3 to 7 V/m around and inside a building that is within 200-300 feet
of the 10KW AM station's three towers. The towers are phased and the
amplitude you measure will change based upon time of day as the station
changes that phasing.
Amplitude is greatly affected by materials,
Heard of this high speed interface?
Anybody know about it?
Need information, please.
Something about IEEE1394
Is the cable defined *very* well? like CAT-5?
- Robert -
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send
Generally, low frequency is dominated by differential mode caused by the
current demand of the switcher being imprinted across the impedances of the
components; then in the midrange its anybody's guess, but usually common
mode, because the capacitors and series impedance elements start to take
There is a way to do this. *IF* you really want quantitative answers, you
can go through a laborious process (but kinda fun, too) of characterizing
each step of your system's block diagram and the impact you find along the
signal path.
You have to start microscopic then get to the macroscopic
I'll ask our county supervisors (they occupy this building, too)
- Robert -
-Original Message-
From: Bailin Ma b...@anritsu.com
To: 'Robert Macy' m...@california.com; Edward Fitzgerald
edward.fitzger...@ets-tele.com
List-Post: emc-pstc@listserv.ieee.org
Date: Wednesday
Also, filling liquid to very close to the top prevents the bottle from
storing as much energy.
- Robert -
Coca Cola used to lose glass bottles until they reduced the air at the top.
-Original Message-
From: Mark m...@cjbdev.demon.co.uk
To: emc-p...@ieee.org
Isn't there a little wire basket that keeps the cork in? Once that's
removed, it's essentially an armed explosive device.
I've been at parties where people removed the wire retainers and left the
bottles sitting in the ice, supposedly to make it easier to have their corks
removed later. Our
Near our building near downtown San Jose, in what are called the county
buildings, one county building wing had 15 cases of very rare form of brain
tumors. The incidence of a single case is very rare but to have so many in
one building and only in one wing of that building is statistically
The tricky part is making sure that the conversion is the right direction.
1 A/m = 0.01 A/cm
If you have oersteds and want amperes per meter, multiply by 79.577
If you have amperes per meter and want oersteds, multiply by 0.01257
- Robert -
Is this article in *.pdf format for any to pick up?
- Robert -
-Original Message-
From: John Juhasz jjuh...@fiberoptions.com
To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org;
'ri...@ieee.org' ri...@ieee.org
Date: Thursday, November 18, 1999 12:09 PM
Good question.
Have you posted tosci.electronics.cad group to see what their
answers were?
- Robert -
-Original Message-
From: Rains,Mike mra...@foxboro.com
To: 'emc-p...@ieee.org' emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Wednesday,
BE CAREFUL ! ! ! If this PS does not have Power Factor Correction
Many switching power supplies comply with the conducted emissions limits
BECAUSE of the conducting angle of the AC diodes.
Simply said, the AC rectifying diodes only come on for 15--18% of the duty
cycle. therefore the noise
, but install it oneself?)
- Robert -
-Original Message-
From: Matthew Meehan mee...@i-kk.co.jp
To: Robert Macy m...@california.com; emc-p...@ieee.org emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, November 16, 1999 10:49 PM
Subject: Re
For our building we used a 1500W glowing (resistive impedance load) heater.
Measure before, then turn on measure after and calculate the impedance.
Also measure adjacent branches to get a feel for how much impedance was in
the branch and how much was at the transformer and drop.
This is more
.
Bob Martin, PE, NCE
Sr. Technical Manager
Intertek Testing Services
(978)263-2662
fax(978)263-7086
r...@itsqs.com
The opinions expressed are my own and not necessarily those of my
employer.
-Original Message-
From: Robert Macy [mailto:m...@california.com]
Sent: Monday, November 15, 1999 6
Hi, Hans,
Are you thinking of Four Phase ??
Weren't they a competitor to Tandem Computers?
Don't know who did the first hot swap disk drives. Patent search tell
you? Remember at one time it was really important to be able to pull out a
hard drive and secure it away in a safe someplace. Boy,
Take a look at Radio Technical Commission for Aeronautics (RTCA) Document
No. DO-160B, Environmental Conditions and Test Procedures for Airborne
Equipment
The copy I have is dated July 20, 1984 Wow time flies!
The cover page is ISO 7137 if that's any help.
Basically, RTCA/DO-160 is
A small pedantic point here:
Coatings are usually rated in ohms per square which is dimensionless.
Looking at the resistance formula:
R = rho * length / Area = rho * length / ( width * thickness )
Given fixed rho and fixed thickness (of the coating) you can see that you're
left
Insertion loss measured in a 50 ohm system could give you misleading
performance expectations in your real world applications.
For example, free space impedance is 377 ohms, knowing the impedance of the
bead will tell you how much attenuation to expect.Or, many sources, like
those from the
Anaconda Sealtite is 12.6mm I/D, 17.8mm O/D;
Mark, thanks for the details, but are you certain about that 17.8mm diam?
Seems like that would really interfere with most holes.
- Robert -
-Original Message-
From: Mark m...@cjbdev.demon.co.uk
To: emc-p...@ieee.org
Thanks for the details.
Just in case you accidentally permanently affect your monitor ( like I did
after playing with one of those really strong space magnets); use a cheap
electric pencil sharpener to degauss your screen's metal mask when the
power-on degausser isn't strong enough.
You're
I've got some toroids sitting on the bench (about 2 inches in diameter) that
would accomodate that with around 20 turns of doubled up 12 Awg wire.
You need them?
- Robert -
-Original Message-
From: Derek Walton l...@rols1.net
To:
Light colored, self adhesive shelf liner?
- Robert -
-Original Message-
From: WOODS, RICHARD wo...@sensormatic.com
To: 'emc-p...@ieee.org' emc-p...@ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Friday, October 01, 1999 3:44 PM
Subject: RE: Coatings for
Deflect 2 degrees?
Hmmm. The earth's magnetic field is around 50uT. To deflect the compass 2
degrees would take 1.7uT at a right angle, right? Therefore, you could set
a level of 1 uT residual magnetism for your testing requirement and have
some margin.
With that quantized number, you could
That pretty much takes a four point measurement.
However, if you're after only reading about the right value, or side by
side comparisons of the esr of a cap, try Dick Smith's esr meter.
Less than $60 in kit form from Australia. Is easy to put together and
extremely functional for measuring
You can use the HP 141T (storage scope mainframe) and the analyzer plugins:
The 8552 IF section, 8553 (low frequency analyzer), 8554 (up to 1GHz),
and/or 8555 (way up there)
Some of these systems have been floating around for less than $1500, can't
get much cheaper if you want qantitative data.
Message-
From: Robert Macy [SMTP:m...@california.com]
Sent: Monday, September 13, 1999 2:09 PM
To: Jim Eichner; 'EMC-PSTC - forum'
Subject: Re: Sweeping components and filters
I use that HP Network analyzer that goes to 500MHz. On a component by
component basis. Then shove that all into a PSpice
I use that HP Network analyzer that goes to 500MHz. On a component by
component basis. Then shove that all into a PSpice circuit which allows me
to add parasitics, etc.
Then I can play games with waveforms, risetimes, components, etc and pretty
much predict what the filter will do.
Sometimes
My experience with the HP spectrum anaylyzers is that it has about 35dB NF.
You can calculate this from observation *and* from their data sheets.
So if you want the analyzer to not contribute, you need a lot of gain in
front. I'd recommend two stage amplifiers.
Plus, you really have to make
Not sure, but check into Light Rail. They use 600Vac (I believe) and use
the natural insulating qualities of concrete (where the rails are placed) to
give fairly good isolation from ground.
From memory - the rails are the return terminal.
- Robert -
-
Hello
Try Digital Power Corp in Fremont, CA
510 657 2635 or their VP Mktg: bh...@digipwr.com
- Robert -
We are looking for a supplier of 300 Watt PS2, PC power supplies that have
PFC
(Power Correction Factor).
Here is the spec:
It must
Have you checked the resonance size of your ground plane? Or, multiple
resonance size?
Perhaps, the area where the turntable sits just aggravates all this.
- Robert -
On Thu, 29 Jul 1999, WOODS, RICHARD wrote:
Thanks for all the comments. Some
Absolutely, *PLUS* you pick up the advantage of natural shielding (the
ground plane) between you and the RD going on down below.
- Robert -
On Mon, 3 May 1999, Gary McInturff wrote:
I'll agree with Brent, and others, the headaches of a metal room or the
. In Robert Macy example of a 25% duty cycle perfect square wave not
containing a fourth harmonic is just a twice the fundamental square wave. If
you apply the Fourier series math are a Fast Fourier Transform, FFT, on his
illustration, the fundamental frequency will be higher and the second
OOPS!
On Wed, 21 Apr 1999, Robert Macy wrote:
Can't make a general statement. A perfect square wave of 50% duty
cycle is missing all the even harmonics. A perfect 25% duty cycle is
missing every harmonic that's a multiple of 4 with even harmonics higher
The amount of harmonic content in a waveform is weather it is an even or
odd or somewhere in between function. A triangle waveform has all
harmonics decreasing in a 1/N function. A square waveform has harmonics
decreasing in a 1/(N*N) function. A perfect square wave (centered around
zero value
Anybody know what it takes to use a 15 year old chamber and whip it into
shape for maximum certification capability (3 m range only)?
We're talking modular chamber with glued on cones to be dismantled and
reassembled (no doubt all the old cones will be lost)
Has anyone done this?
I am trying to determine the maximum noise figure that I can have for my
1-16.5 GHz EMC receiver system which includes the horn, mixer for above 18
GHz, preamp, cable and spectrum analyzer. I know the following:
* Signal level received by the horn
* Gain through the system
*
Anybody out there have a chamber for sale?
Need at least 3m testing of a small refrigerator size.
- Robert -
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line:
IMHO the magnetic fields go right through the watch case and either
disrupt what's going on or can even magnetize the parts. Either way, the
parts are like stuck together and the watch won't run well.
Also, my father could never wear a watch, a great gift watch always would
stop. The same watch
Two issues of emc will hit you.
1) the trigger for the arc
This one is a pulse that is used to fire the arc. Usually, 20-30KV spikes
that hit once a second until an arc generation is detected.
The noise from these can be quite impressive, but at least they're not that
broadband.
2) the
If you have time, you can make the turntable (assuming light load) from a
drain pipe pvc (large diameter) which is attached to an antenna rotor
(those used in people's homes who live in fringe area).
The thing was all strapped and glued which had to be inexpensive.
Although uncalibrated
I've got copies of the MPRII rules. They'd have to be out of date by now,
(circa 1990) but at least it's good reading. I should have the origin of
the MPRII printouts somewhere, but not off the top of my head.
If you strike out, give me a call:
Robert Macy 408 286 3985
The ferrites remove the cable from the fields to some degree. No matter
how perfect the baluns are the cable still represents a conductor out in
the middle fo the fields you're working with.
- Robert -
On Thu, 12 Nov 1998, WOODS, RICHARD wrote:
Hans,
If this temperature is the absolute value, not much of a problem. But if
this is the rise above ambient, big problem.
That means you get about 24C rise and if that's operated in a hot office
space like at 35C then thee base plate gets *very* hot.
Once in our non-airconditioned office on a
Sorry, to not get this in before your summary.
When Sony (video div) was my client, they had an internal spec margin
requirement of 8 dB.
That's right! 8 dB below Class B limits.
After going though that I'm convinced to use Sony equipment as support
electronics. g
It is my understanding that this margin is a carryover from VDE
requirements where for statistical reasons you need 2.2 (?) dB margin in
order to infer that from a single unit test, your other units will also
comply. It is also my understanding that that margin was waived when 3-8
units were
Yes, you're doing it right.
With the transformer between the AC mains and the LISN it is essentially
out of the loop. The spectrum analyzer looks through the LISN at the
EUT's conducted emissions.
You see, there is quite a filter between the LISN and the AC mains, so
adding the transformer
I only got around 43KB also.
- Robert -
On Wed, 21 Oct 1998, Scott Douglas wrote:
Hello again,
Someone complained that I sent 35 MB worth of disk consuming attachments
along with my e-mail regarding Euro-Lex. In fact, the two attachments were
total 43
Is there anyway to remove the paragraph emc-pstc adds to the msgs?
I archive all the msgs and it's starting to look like 30-40% of the text
are those paragraphs! It's really noticeable when a quoted msg has a
quoted msg with a quoted msg.
Don't get me wrong. That paragraph is really handy.
Check with your local AM-FM Radio Station Engineers. Can't remember the
name, but they brought one with them when we had a problem with a local
AM station getting into all the data terminal lines.
- Robert -
On Tue, 22 Sep 1998 slong...@masoncom.com wrote:
My experience with power supply design treats both hot and neutral with
equal care. That is, you could reverse hot and neutral and not endanger
any characteristic of the supply.
So the conclusion is that if you ran a properly designed poweer supply
from 208 you'd have no problems.
rbus...@es.com wrote:
My company manufactures systems which incorporate power supplies from
various manufactures. Typically these supplies have ratings such as
100V-140V/200V-240V and are designed to operate on a single phase input.
Some of my customers have the US 208V 3 phase power
Look into aircraft extinguishers. They can put out a fire without hurting
the electrical equipment, leaving no (or little) residue.
I've got three small ones. But they're freon, I believe. May not be able
to get such again.
- Robert -
On Tue, 1 Sep
On Tue, 25 Aug 1998, Muriel Bittencourt de Liz wrote:
Hello,
I'm working with EMC at the field of power electronics and i'm
interested in developing filters for conducted EMI. I've looked for
designs at some books, but they aren't very practical.
Could anyone send me some information
Need to find the RFI/EMI emissions requirements for the US market for a
microprocessor controlled, noninvasive ultrasonic diagnostic equipment.
Was told that since FDA got involved that *all* emissions requirements are
waived for this product line.
Is this true?
If not true, exactly what
Need to find the compliance requirements for medical therapy equipment
that uses high power X-Rays to destroy tumours. Both for US market and
the European market.
I specifically need to find the RFI/EMI emissions requirements for the US
market and the electrical compliance requirements for
cc: ed.pr...@cubic.com
EDFrom: ed.pr...@cubic.com
EDSubject: RE: RF fields and biological effects
EDroat, a researcher had to stand in front of the horn antenna, peering into t
EDantenna throat with his face pressed up against the bell jar glass. The writ
EDsaid that the researchers would trade
For measuring emissions per CISPR 22B what is the proper distance for
the placement of the antenna?
Is it 3m? or 10m?
[I'm running across reputable labs that claim there is nothing wrong
with measuring everything at 3m, just like FCC B.]
- Robert -
cc: Heck, Stefan
cc: emc-p...@ieee.org
STFrom: Heck, Stefan stefan.h...@dnv.com
STSubject: MIL-STD-461/462D, RE102, noisefloor
STSystem requirements for RE102
STWhen performing the emission test RE102 according to MIL-STD-461/462D we
STobserve that the test system noise floor is at some
cc: Paul Herrick
cc: emc-p...@ieee.org
00From: Paul Herrick 0007515...@mcimail.com
00Subject: PFC on PS2 power supplies
00Does anyone know of a power supply manufacturer that presently has a power
00factor corrected, PS2 form factor, (or ATX form factor) power supply?
Digital Power
cc: Grasso, Charles (Chaz)
GRFrom: Grasso, Charles (Chaz) gra...@louisville.stortek.com
GRemc-p...@ieee.org
GRCan anyone point me in the direction of any information on this subject...
The original:
The Blue Angel was a movie made in 1930 (German Production) directed
by Josef von Sternberg
BRFrom: Bob Brister bris...@mail.dec.com
BRSubject: Input power connections with removable cord set.
BRI may have inquired of this forum on this subject before, I can't
BRremember. I
BRam interested in what your experience has been with overheating of
BRremovable cord sets at the equipment input
emc-pstc newsgroup
cc: Robert Johnson
ROFrom: Robert Johnson robe...@ma.ultranet.com
RODoes anyone know any reason why the IEC 320 C-14 connector style cannot
RObe used for DC power? Specifically, we have an application for primary
ROpower entry in the 48-70 Vdc range, typical of telecom
TJFrom: Terry J. Meck tjm...@accusort.com
TJWe have a product coming up in which it has been
TJproposed the PE Ground be terminated through an
TJanodized coating by a bolt, `star washer' and nut
TJclamping onto a channel.
TJI disagreed. I feel for PE to be `reliably connected' (
TJUL1950 Sec.
KAFrom: kathy@eng.sun.com (Kathy Toy)
KASubject: EMI verses RFI
KAFrom: moses.naji...@ccmailsmtp.ast.com ???
KAI am a safety person who needs to answer a question
KAfrom one of our sales people on the question of
KAEMC verses RFI.
KAIs there anyone out there who can explanation the
-
AVFrom: avxsc...@ms3.hinet.net (Scott Chiang)
AVI'm looking some advices from the ESD protecting on antenna
AVmatching network. I have put ESD protection device (TVS,contains ~50pF
AVcap) in parallel with existing matching circuitry,
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