USB-6008 Analog Input Accuracy?

[KLange]

Hi I am developing an application where I use the differential inputs on a USB-6008  on the +20/-20V range I get roughly 10mV accuracy, however when I switch only to  the +1/-1V range, the accuracy doesn't seem to change.  It is still roughly 10mV. 

Here are my VBasic commands,

    DAQmxErrChk DAQmxCreateAIVoltageChan(task_AnalogIn, "Dev1/ai0:3", "", _
                    DAQmx_Val_InputTermCfg_Diff, "-20.0", "20.0", _
                    DAQmx_Val_VoltageUnits1_Volts, "")

    DAQmxErrChk DAQmxCreateAIVoltageChan(task_AnalogIn, "Dev1/ai0:3", "", _
                    DAQmx_Val_InputTermCfg_Diff, "-1.0", "1.0", _
                    DAQmx_Val_VoltageUnits1_Volts, "")

    'Configure task for finite sample acquisition and read in data
    DAQmxErrChk DAQmxCfgSampClkTiming(task_AnalogIn, "OnboardClock", "100", DAQmx_Val_Rising, _
                    DAQmx_Val_AcquisitionType_FiniteSamps, "4")

Am I doing something wrong, or do I need to change some other statement???

Thanks Kelly

[KLange]

Never Mind!   I had problems with my hardware, the USB-6008 works just fine

KL

[Erik_J]

Hi Kelly,

Thanks for letting us know!  Have a great day

Regards,
Erik J.