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My question is
1) why do we connect a pos n neg but not a ground/screen wire in a Tx but on a junction box and on DCS we do connect a ground wire?
2) what happens if the is a corrosion on terminal connections of a transmitter in relation with current and resistance?
3) a self powered loop please elaborate with an example on this one e.g where does the power comes from (source).
4) info around magnetism to understand it more in a practical manner.
Your help will be highly appreciated!!!
1) why do we connect a pos n neg but not a ground/screen wire in a Tx but on a junction box and on DCS we do connect a ground wire?
2) what happens if the is a corrosion on terminal connections of a transmitter in relation with current and resistance?
3) a self powered loop please elaborate with an example on this one e.g where does the power comes from (source).
4) info around magnetism to understand it more in a practical manner.
Your help will be highly appreciated!!!