4072 DMM Capacitance out of range yields -inf or NaN

[spomilio]

Anyone,

   I'm trying to read capacitance from our NI-4072, but if the value is out of the range limit (as confirmed by using the softpanel interface), the data returned is either NaN or -inf.  If someone knows how to change the Range setting to 1nF or other than 300pF, I believe my problem would be fixed.  The documentation specifically states the Auto-Range feature is NOT supported for capacitance, so that's no help.

I've also performed the open cable compensations: 

    dmmSession.CapacitanceAndInductance.CableCompensationType = DmmCableCompensationType.Open;
    dmmSession.CapacitanceAndInductance.PerformOpenCableCompensation( out x, out y );

but get the same data when reading the measurements.

Thanks,

Steve

[Bumblebee_Tuna]

Hello,

What environment are you programming in?

-Jayk

[spomilio]

I'm using C# in VS 2010.  Project is built to framework 4.0

and the NI driver version 14.0

[Bumblebee_Tuna]

Have you been able to look at any of the shipping examples for how they are configured?

[spomilio]

I've copied fro the example in DMM projects which measures capacitance, and I appear to be able to change the "CapacitanceRange" value by calling the Configure method (twice, as the value does not change the first time, bug?).

I've brought the range up to 0.0001 and still can only read Infinity.

[D-Cubed]

Hi, spomilio

Can you post a snippet that represents how you are configuring your measurement? Do you see the issue where you have to call the Configure method twice in all places that you use it, or only when configuring the capacitance range?

Thanks,