12-05-2005 08:24 AM
12-05-2005 08:51 AM
12-05-2005 09:05 AM
12-05-2005 09:12 AM
Hi:
Am I confuse here? Because I have a fixture which is connected to 9V DC power supply WITHOUT earth. The CB68LP and 6250 is connected to the computer. The computer has an earth ground. Once I connected DGND from CB68LP to the fixture, the gounds are all connected together. In that case, can you consider the ground has a ground loop? I read the tutorial. The link is http://zone.ni.com/devzone/conceptd.nsf/webmain/177A8B29FEDC0F5886256FA90083C0F8
It said the ground loop is the potential difference in two individual ground signal source. In my case, one of my test fixture is a floating source. So, I think it is not a ground loop. Is that right?
I need to verify with you. If not, could you please explain?
12-05-2005 09:36 AM
12-05-2005 09:37 AM
First: the operation of my test fixture is like:
1) press "enable" button using digital I/O in Labview
The current will flow from my fixture to NI5112 ground through BNC cable. BNC cable is a hard ground. It means most or all currents will select to go to this ground.
I would like to ask when i press enable button, the current will go from
Again I need your direct answer in both questions.
12-05-2005 09:48 AM
Hi Buechsens:
2) it seems that I have no ground loop in my set up. But why my fixure negative terminal is 0V from the 9V DC source, now it is connected to DGND (negative terminal of computer earth). I was not sure the DGND voltage. SInce DGND is connected to the negative terminal of 9V DV power supply, I belive it is 0V. am I correct? Pls verify me here.
If the answer is yes, then DGND will not conflict with the computer earth? Would you please give a good explaination so that it make sense.
12-05-2005 10:18 AM
12-06-2005 01:21 AM
12-06-2005 01:33 AM
First: the operation of my test fixture is like:
1) press "enable" button using digital I/O in Labview
The current will flow from my fixture to NI5112 ground through BNC cable. BNC cable is a hard ground. It means most or all currents will select to go to this ground.
I would like to ask when i press enable button, the current will go from
Again I need your direct answer in both questions.