Hi,
Our lab recently purchased a Dell Precision 650 workstation along with
a Dell 2000FP LCD monitor. We installed our DAQ boards, a PCI-6733
and a PCI-6120, and everything seemed happy. The PCI-6733 is
connected to our rack by the CA-1000, and the PCI-6120 is connected by
a BNC-2110.
We were testing the setup and noticed that there was a DC offset of
about 50 mV when monitoring channel 0 of the PCI-6733 on a scope. The
offset was present on all the output channels. No LabVIEW programs
were running and no signals were being sent. After trying a few
things, we turned off the monitor, and the offset disappeared.
We then tried to plug the monitor into a different outlet. We tried
using the RGB connection of the monitor. We tried using the DVI
c
onnection of the monitor. We tried changing the position of the
monitor. Nothing worked and the offset remained. We were also able
to reproduce this offset by using our old DAQ computers with different
DAQ boards and different graphics cards along with the LCD monitor.
We then connected our old CRT monitor and the offset disappeared.
Has anyone experienced any problems with LCD monitors? Has anyone
experienced similar problems with this particular model, the Dell
2000FP? It's hard to believe that the offset is caused by the monitor
but all of our tests so far have shown that that is indeed the case.
Thanks in advance,
Brian
