The connecting of 68-PCB

[Tomas_E]

We can connect wires to the PP-68 PCB, but the connecting is not as safe as soldering. I am now testing the voltage from screws which are soldering to the definite lines, and i don't know whether the noise is coupled into the circuit by the other screws from the space(just like small antennae). I have a 68-POS right angle PWB mounting, but is hard to test directly from the pins(too near between the two pins). How can i verify the coupling effect of the connecting screws?

[eeguy]

Tomas,

Whenever I need to measure things in tight spaces I turn to my special scope probe tips, with them I can access those remote places and take measurements.

Just by doing a search in google you'll find probe kits like this one:

http://www.probemaster.com/german/page1.html

I use a similar kit to probe ICs and tight connectors. With them you'll be able to use the Scope to verify the noise.

good luck

eeguy

[<Mike Ross> mross@smpcorp.com]

Tomas,

At some level every conductive thing is coupled and is an antenna. But I doubt the screws of the SCB-68 are a significant problem.

As we have discussed before, I am doing DAQ in a noisy environment as you are. I have, by the process of elimination, demonstrated that my noise is radiated by my motor drive. Where exactly it is coupled to my system is not easy to find. I solved my problem by other means than shileding.

I don't think think anyone can answer the question you have asked regarding the screws. I think you should look elsewhere for a solution. For "most" applications the SCB-68 and the screw terminals work very well.

Again, I recommend the literature on Field Wiring and the Keithly and other books I described prev
iously.

Sorry and good luck,

mike