Is it okay to wire chassis ground directly to earth ground in a DAQ system?

[zenith]

Is it okay to wire chassis ground directly to earth ground in a DAQ system?

The system contains:

pressure sensor >> amplifier circuit>>filter circuit>>DAQ card

A meanwell switching power supply was adopted as the power source.

I wired AIGND and sensor gnd and signal conditioning circuit gnd as analog gound together and connect to -V on the switching power supply.

There is a chassis ground pin on the power supply.

Should I wire wire chassis ground directly to earth ground ? I am not very sure if the outlet of the building was well grounded to earth.

Do you have any suggestions on my DAQ system ?

由 zenith 在 01-23-2007 12:36 PM 上編輯的訊息

[jwf]

It will probably be important to connect the power supply ground terminal to building ground for safety reasons.

Does the Meanwell power supply have an isolated output?  The system may behave differently depending on whether or not the power supply output is isolated.

--Jason