Advantech RS-485 Manual de usuario descargar pdf (Pagina 335)

100

101

ADAM-5000 F-3

Appendix F

3. Noise Reduction Techniques

4. Check Point List

F.1 Grounding

1.1 The Earth for reference

Figure F-1: Think the EARTH as GROUND.

• Why we think the EARTH as GROUND?

As you know that the EARTH can not be conductive indeed. But all

buildings base on EARTH. Steels, concretion and relational cables

such as Lighting Arrester and power system were connected to

EARTH. Think them as resistors, then those infinite parallel resistors

make the EARTH as a single point and just for reference.

Why we think the

EARTH as GROUND?

As you know that the EARTH can t be conductive indeed.

But those parallel resistors make the EARTH as a single

point and just for reference.

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