One can also use a pair of probes known to be well balanced and take the
difference between the A and B channels, or
use a differential input accessory or plugin. There is then no possibility of
high-voltage on the instrument chassis.
Cortland
(my own thoughts, and nor those of my employer)
I read in !emc-pstc that Mavis, Robert rma...@pelco.com wrote (in
B2CC0E0F2C10D511B86600B0D0689842024F816C@localhost.pelco1) about
'surges on 24VAC', on Fri, 21 Dec 2001:
The AC Mains test is just that AC Mains. The Definition of AC mains is
basically what comes out of the wall. Since the
If the 24V AC is generated via a Class II Direct Plug-In power
pack, wouldn't the test be run 'through' the power pack - the power
pack plugged into the outlet on the surge tester?
The power pack runs off of AC Mains.
For argument sake, what's the difference of that scenario
as compared to
Just a reminderalways make certain that no signal gets in to saturate,
or even start to overdrive, your amplifier at frequencies you're not looking
at.
- Robert -
Robert A. Macy, PEm...@california.com
408 286 3985 fx 408 297 9121
Low frequency conducted noise is usually generated by the periodic demand on
the energy storage cap (greatly, greatly affected by esr). This noise is
differential and no y-cap (unless it's so large it becomes a killer size,
and then not really) will stomp on it.
Your first problem (conducted
Hello,
Miteq JS22-00050800-15-14P with 40 dB gain, 30 to 8000 MHZ Contact Rizwan
Syed at 631-439-9458
Miteq AFS66-00102650 - 45-5P-66 40 dB gain
Agilent 83006 10 MHz to 26 GHz 20 dB minimum
Agilent 83017
The Agilent amplifiers are not as sensitive to ESD as the Miteq's. The gain
of the
The limit for RE is based as I said in an earlier message on the television
band rf signal level required to get a specified base band video
signal-to-noise ratio. The fact that the interference coupling mechanism is
near field is not important, except of course as it affects measurement
MITEQ and Mini-Circuits come to mind for octave and multi-octave band amps.
HP (Agilent) makes the the 8348A covering 1 - 26.5 GHz around $14 K. The HP
model has a 10 dB noise figure and 25 dB gain below 20 GHz. With MITEQ you
can pick your noise figure and gain from a large variety of models.
From: Cecil A. Gittens
Does anyone have information about products that will required EMC
certification to meet the new
China Compulsory Certification system.
It was mentioned that they will host meetings in the future to introduce
this new system.
Regards
Cecil
Dear Oliver,
For the European Market, as per EN50131, the Power supplies for Intruder
alarm systems shall comply with the applicable requirements of EN60950,
EN60529 (Electrical safety portion).
I can not foresee any reason to do not extrapolate this fact to the IEC
Standards...60950, 60529.
The AC Mains test is just that AC Mains. The Definition of AC mains is
basically what comes out of the wall. Since the product is 24VAC it falls
under low voltage/signal lines. Test is as a signal line.
-Original Message-
From: Jennifer Banh [mailto:jb...@bb-elec.com]
Sent: Monday,
Hi group,
Merry Christmas and Happy New Year!
Does anyone know what is IEC Safety Standard of Antitheft Surveillance
Device, which is standed at the exit/entrance door of commerical store and
department to detect/prevent any merchandise with magnetic piece being
stolen. It is wireless and as
Reginald,
I was somewhat pessimistic about your chances of finding what you were
looking for.
I just got some literature today which mentions a company called
Lumburg. They have some bulkhead Ethernet adapters; the likes of which
I haven't seen from anyone else. Try www.lumbergusa.com.
Dear Fellow EMC workers,
I am trying to get a SMPS to pass this GOST standard and am having a devil
of a time getting it done. After 3 days of mitigation testing at our local
lab we are still out at the low frequency range 10-60kHz and at 15-50MHz.
We pass the Class A limits for CISPR 22 but
Bob,
the Schaffner preamp goes to 3 GHz I believe,
Derek.
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To cancel your
Hi Xing Weibing:
One of the problems of making oscilloscope measurements
within switching-mode power supply circuits is that the
common side of the oscilloscope *MAY* change the waveform.
There are two ways to minimize the effect of the common
side of the scope from affecting the waveform:
John Woodgate wrote:
I would be suspicious of that; it is a 'near-field' scenario, which
means that the emission field strengths are complex and impossible
to
calculate. The Class B limits are related to a 10 m separation of
source
and potential victim, and that implies far-field conditions
I thought some PSTC subscribers (especially any involved in safety systems
that depend at least in part on software or electronics) might be
interested in this. The IEC has recently (Dec 2001?) posted an FAQ for IEC
61508, Functional safety of electrical/electronic/programmable electronic
Ron,
Yours is an interesting suggestion to use filtered DB25 connectors on
the chamber connector panel, and RJ45-DB25 adapters inside and out.
My only comment would be to be careful of DB25 filters with
any significant capacitance from signal to shield.
When used with RJ45 adapters, these
This question may have recently posted but I'm not able to search the
archives so I'll
ask again.
We have an immediate need for a pre-amp above 1000 MHz. Would you be so
kind
as to let me know what brands/models and frequency range you are using. Any
pro/con
insights would be welcome as well.
Happy Holidays Reginald,
Corcom also makes flanged/filtered RJ45 (or 8 pin modular, if you
prefer) jacks.
I have seen many manufacturers that filter these jacks (Amphenol, Amp,
Corcom, possibly LZR...). Most of them have already been mentioned.
Problem is, I'm not sure what you mean by a
The CE limits were designed entirely empirically but the RE limits were
based on EIA TV standards that require a specified signal quality for a
given rf input level. The RE limits were simply set X dB below that EIA
specified level. My recollection is that the rf level specified would be a
Hey folks,
Happy Holidays for those celebrating!
Kaz Gawrzyjal
Dell Computer Corp
---
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Acutally, the term RJ is used by the FCC for designating
connectors that are part of the registration (now approval)
process. So why would you want to call a ethernet connector
by a designation used by the telephone industry?
I am not going to police the use of the term, but I wanted
to put that
I read in !emc-pstc that Doug McKean dmck...@auspex.com wrote (in
006801c18988$24b4a2a0$3e3e3...@corp.auspex.com) about 'EMI guard
bands', on Thu, 20 Dec 2001:
Anywho, the answer I got back from him was that
the limits were empirically derived in reference to
interfering with television
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