Bill,
Laptops and tablets are Class B because they are commonly used within
homes. A vehicular hard-mounted docking station installed within vehicles
is not.
I've worked for/with industrial control equipment companies for many years
and their panel-mounted PCs are all Class A devices. It depends upon
either where it's used or what type of AC mains connection is involved for
most emissions standards. If this were an ISM device then CISPR 11 would
clearly indicate that it's a Group 1 Class A device because it doesn't
connect to the public AC mains.
Thanks for your reply,
Carl
On Fri, 29 Jan 2016 15:23:54 -0500, Bill Stumpf <[email protected]> wrote:
Mr. Newton asked for opinions, so for what it's worth, here is mine. I
hope you will all excuse my rant. Many will interpret the "exclusions"
based on their viewpoint. Not being associated with a manufacturer, my
interpretation may be different than others. The FCC excludes devices
used exclusively in transportation vehicles from the technical
requirements of part 15, but not the general requirements "thou shall
not interfere". This FCC exemption also does not apply to devices that
could be used removed from a vehicle. An example would be a device that
connects to a vehicle USB or cigarette lighter power outlet. I have to
believe that the exemption exists because the FCC considers devices
installed "hard-wired" in transportation vehicles as covered by other
EMC requirements. Canada's exemption (ICES-003) specifically states
that it is only for devices that are factory installed in the vehicle.
Similarly then, for EU compliance I would look at this the same way and!
agree with Mr. McInturff. Laptop & tablet PC's are Class B.
Therefore as a Class B PC peripheral (auxiliary) device, it seems
logical to apply Class B to the docking station.
Bill
-----Original Message-----
From: Jim Hulbert [mailto:[email protected]]
Sent: Friday, January 29, 2016 1:33 PM
To: [email protected]
Subject: Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation
The FCC also exempts a digital device utilized exclusively in an
appliance, e.g., microwave oven, dishwasher, clothes dryer, air
conditioner (central or window), from the its Part 15 technical
requirements, so being rational doesn't always make sense.
Jim Hulbert
-----Original Message-----
From: Carl Newton [mailto:[email protected]]
Sent: Friday, January 29, 2016 2:04 PM
To: [email protected]
Subject: Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation
Gary,
With regard to auto EMC compliance, that is taken care of already. This
hardware is being subjected to AU/NZS CISPR 22 simply to satisfy AU ACMA
requirements. I appreciate your comments concerning the residential
zone, but I don't agree that simply because a vehicle may travel within
that zone that Class B is warranted. I would still expect the vehicle
to be no closer to homes than 10m in typical scenarios.
From a pure EMC rationale point of view, consider that in the USA the
FCC exempts auto hardware from Part 15 rules.
Thanks,
Carl
On Fri, 29 Jan 2016 13:02:33 -0500, Gary McInturff
<[email protected]> wrote:
These vehicles travel between residential and commercial zones on a
regular basis, so on that alone I would agree with the class B
assessment, but I'm wondering if you don't have lots of other EMC
issues to deal with - automotive immunity etc.
The only time I've personally seen an exemption for Class A in a
residential zone was for telecommunications equipment installed into a
room or facility owned by a telecom company. Doesn't mean there aren't
other exemptions it just means I am unaware of them. So I think you
stuck with Class B IMHO
-----Original Message-----
From: Carl Newton [mailto:[email protected]]
Sent: Friday, January 29, 2016 9:10 AM
To: [email protected]
Subject: [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation
Group,
My customer builds vehicular laptop and tablet docking stations
intended for hard mounted use within emergency vehicles such as police
and ambulance, as well as work trucks and forklifts. The vehicular
power supply narrowly missed CISPR 22 radiated Class B limits. Then
their AU Responsible Party told us they called the ACMA and they
"insisted" this is a Class B device. I then sent my own request to
ACMA and received the reply below.
In my opinion the ACMA individual is clearly biased toward the Class B
rating, but the fact that he leaves the door open to the Class A
rating is enough proof for me that he agrees that it is a Class A
device.
However, my customer is looking for safety in numbers. The author
raises a valid note of caution concerning receivers within vehicles,
but these systems are already compliant with CISPR 25 and are widely
used within North America and Europe with no interference problems so
we're not concerned with that warning.
I would appreciate it if some of you would review this information and
provide your professional opinion as to whether vehicle mounted ITE
qualifies as Class A or Class B:
+++++++++++++++
Dear Mr Newton
Clause 4.1 of AS/NZS CISPR 22 (which is identical to CISPR 22, Ed. 6.0
(2008)) includes the following;
Class B ITE is intended primarily for use in the domestic environment
and may include:
- Personal computers and auxiliary equipment.
Note: The domestic environment is an environment where the use of
broadcast and television receivers may be expected within distances of
10 m of the apparatus concerned.
Given that the class B limits apply to “personal computers” (which
would also include “tablets”) it would seem logical that your mounting
stations “for computers and tablets” (which I would think fall within
the definition of “auxiliary equipment”) should comply with the same
limits as the devices they are intended to hold.
I would also think that, because police and ambulance vehicles will
probably have a broadcast (AM/FM) receiver installed in them this
would probably constitute a “domestic environment”. I would also
question whether it would be prudent to have a device meeting the
class A limits installed in a vehicle that relies heavily on two-way
radiocommunications equipment where said device may interfere with the
operation of this on-board radiocommunications equipment.
Having said that, clause 4.2 of AS/NZS CISPR 22 includes the
following;
Class A ITE is a category of all other ITE which satisfies the class A
ITE limits but not the class B ITE limits. Such equipment should not
be restricted in its sale but the following warning shall be included
in the instructions for use:
Warning
This is a class A product. In a domestic environment this product may
cause radio interference in which case the user may be required to
take adequate measures.
It is up to you whether you wish to comply with the class A or the
class B limits however, I would personally err on the side of caution
– if an ambulance or a police car were unable use its
radiocommunications equipment and it turned out it was due to
interference from your device the legal ramifications could be costly.
Regards
XXXXXXXXXX XXXXXXXXX
Technical Regulation Development Section Australian Communications &
Media Authority
++++++++++++++++++++++
Thanks group,
Carl
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