Appendix 8 Mitigating Noise
A22
Using separate power supply lines
It is preferable to place power circuits, welders, and other equipment on a separate power
supply from the instrument.
Adding a common-mode filter (EMI choke) to the noise path
Choose common mode filters with as high an impedance as possible and use multiple fil-
ters for increased effectiveness.
Isolating lines
It is highly effective to optically isolate control lines. It is also effective to isolate power sup-
ply lines using a noise-cutting transformer. However, note that shared ground lines before
or after the isolation can make this approach less effective.
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