All,
There will be a Northeast Product Safety Society / CNEC
Product Safety Engineering Society meeting tomorrow, April 25th, at the Holiday
Inn, Boxborough MA. A social hour with
light refreshments will begin at 7:00 PM and the technical meeting will start
at 7:30 PM. Steve Brody will
be
Dear members,
Do you know if Short Range Devices in Brazil are allowed using 433 MHz?
And IF, what are the limitation on transmitted power/field strength, and
duty cycle (if limited)?
Or does Brazil follow US and normally use 915 MHz frequency range for SRD?
Regards, and thanks in
This is a classic test problem. I've seen this several times. For this
setup, there is no place for the charge to dissipate between zaps. So,
how to discharge between zaps? The easy answer is to briefly connect a
strap from apparatus to ground. But that casues lots of problems,
including
For automotive stuff (ISO10605), I have to be careful about bleeding charge
after each iteration because test level = 25kV. I use a 470k Resistor
attached in series with a short braid that is screwed into the ref plane,
and touch the UUT. The strap is used for discharge only and is not attached
Looking for a southern california lab that can do impulse test per
IEEEC57.12.01/IEC60076 on a reactor coil with 1100Vac rated working voltage.
thanks much,
Brian
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This message is from the IEEE Product Safety Engineering Society
Brian,
In a prior life we had several products that were sensitive to charge
build-up. When they asked me about the problem I showed them where the
ESD standard allows discharging between hits. We used the same sort of
process - 470k resistor in series with the ground braid attached to the
There are some carbon brushes out there designed for removing static from
vinyl records which should do a very gentle job of bleeding down the charge,
but the best cheap solution I've used is a copper scrubbing pad (lots of
contact edges) in series with a 470k resistor. A touch with a finger does
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