50 Hz

[pdupre]

Hello,

I am experiencing some problem with a card PCI-6251.
I have 2 of them on 2 different computers. One with a SCB68 and
one with a BNC2110. The cables are 1 and 2 meter long.
One exhibits 10 mV and 50 Hz and the other one: 20 mV  on the Analog
Outputs.
The one I checked the more has 10 mV, it even does not disappear when I
set the PC on a UPS and so get rid of the possible ground loop.
The amplitude of this 50 Hz does not depends on the amplitude of the
output as well of the output current.

Is there any help that I can get to get rid of those signal ?

Thank for your help.

Regards.

[DanBrowne]

Hi pdupre,

Is your setup near any strong sources of EMF, such as machinery etc, since 50Hz noise can also be caused by external electrical equipment. Have you tried using the system in a lower noise environment to see if this changes anything?

Regards,

Dan - NIUK