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Emi

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wuchy143

Member
Hello,

I need to do some EMI testing at a test house and have a question about wires inside the cable for my product.

Basically I have an RS422 serial product which only takes about ~50mA to power. It has power, ground, Data "+" and Data "-". It also has another differential signal which given a certain condition will put out a short 100uS pulse up to +5v and then returns to it's resting state which is 0 volts.

During testing I'm not sure what to do with these two differential signals. I wont be monitoring them so leaving them floating just doesn't sound like a good idea as they are pretty much an antenna.

I'm thinking having a high resistor to ground on both the signals may make them quit and not disrupt my EMI testing. Any ideas which would be better? Or more ideal.

Thanks for any replies.

Regards,

-mike
 

MikeMl

Well-Known Member
Most Helpful Member
The EMI lab should provide guidance. You want the conditions to be as close to reality as possible.
 

wuchy143

Member
agreed. I'll talk to the test house engineer. Looks like I"m going to need to look into exactly how the product will terminate those signals to ensure what you have said below.

Thanks:)

-mike
 
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