Charles,
47 Hz is a bit silly, since no power grid in the world uses this
frequency. Perhaps a private motor generator ... But if you are using a
switching power supply, the input frequency is not usually important.
However, 90 V is reasonable. Some countries, like Japan, have a nominal
Hi Chaz,
I'm sure the folks in Japan would certainly think it to be reasonable.
Power there is supplied at 100V 50Hz 100V 60Hz depending where in Japan
you happen to be. Common input test conditions at 100V 50Hz line voltage
would be +6% (106V 53Hz) and -10% (90V 47Hz). As you can see, very
Ages ago when I worked at another company that shipped products to Japan,
their unwritten rule was to design in power supplies that operated without
problems at 85 Vac, and that had better be designed/tested down to 80 Vac,
because of the continued brown-out conditions in Japan. It seems
For the US, it is likely that your equipment falls under Part 15 Subpart B
or Part 18 of the rules.
For the EU, it is likely that your equipment falls under the generic
emission and immunity requirements.
Further information about your product is required.
Part 15 is for unintentional radiating
Here's my two cents worth:
1) If I interpret you correctly, a green wire connection from the power
grid has not been made to the room. This could conceivably be a safety
issue. If you don't believe me, measure resistance between your dedicated
chamber ground rod and the facility rod closest
If I am not mistaken, I believe your friend will need FCC Part 68.
Best regards,
Henry E. Green
Gateway
-Original Message-
From: Terry Meck [mailto:tjm...@accusort.com]
Sent: Wednesday, November 03, 1999 1:31 PM
To:
PSNet, et al,
This arguement over the use of Brominated flame retaredants has
been going on for over 10 years... Yes, some Euro environmentalists have
been pushing on this for a long time...
The technical issue is that any replacement materials don't seem to
work as well or
Yes, these are used as flame retardants in some plastics. Check with the
resin manufacturers, they should know about it. GE Plastics for instance,
has published a document stating which plastics have the PBBs.
Darrell Locke
Advanced Input Devices
--
From: Crane, Lauren
To:
The definition of a Digital deveice per FCC part 15.3 is:
Digital device. (Previously defined as a computing device.) An
unintentional radiator (device or system) that generates and uses timing signals
or pulses at a rate in excess of 9,000 pulses (cycles) per second and uses
digital
Don, scott has a good point: if you use a single point grount you might as
well use an isolation transformer to put the room on its own ground. This is
a great way to set up yur room, but it can lead to the problems scott
mentioned and one other big one:
if your room is on its own ground (i.e.
Hello fellow PSTC'ers,
It's only two weeks until the 5th Annual Vendor's Night will be held at
the Holiday Inn in Marlborough MA. If you or your colleagues are in the
area - don't miss the singularly best Product Safety Show in the USA.
Lot's of EMC resources too.
Our tables (50 of them) are
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