6008

[yll]

Hi,

I am new to USB-6008. First, I launch Signal Express and in the "Step Setup, I saw a square wave centered around 1.4V (the input range is -10V to 10V) when all the pins are floating. When I tried to connect A0 (pin1) to a DC voltage of 0.5V and I use LabVIEW DAQ assistant to check ai0, I could not see the correct voltage I applied to it. What is my problem? What is a good way to connect the terminals to the supplies? and how should I test it? Thanks.

[Christian Mergl]

Hey,

What is the signal source? Is it floating or ist it grounded? What terminal configuration did you use, RSE, NRSE, Differential? Did you only connect the +0.5V signal? or also the ground reference? what voltage did you see if not the 0,5V?

You should find all the information an that in the getting started manual es well as in the DAQmx help.

Christian

[PBear]

Hi yll,

You might find some answers by looking at the following KnowledgeBase

KB 3RH97BRM: USB-6008/6009 Analog Input Reads Approximately -1.4V Offset with RSE Connections

http://digital.ni.com/public.nsf/allkb/E687933C5694AB00862570BD00593CA3?OpenDocument