pxi 4070 input impedance

[panninos]

I am trying to modify the input impedance of the pxi 4070 dmm with the NI DMM property node.  When I set the input impedance to greater than 10 giga ohms, I am getting an error outputted after running niDMM Configure Measurements Digits.vi.  The signal that I am measuring is 5V, so I should be able to use the 10 giga ohm input impedance.  I set the niDMM Configure Measurements Digits to autoscale. Could this be an issue that the pxi-4070 is not allowed to have its input impedance changed when the dmm is set to autoscale?

[Sean_N]

You are correct.  When the range is selected, the API automatically selects the input impedence.  If you need to do this programmatically based on the measurement, then you could use a case structure that checks the range being used and then sets the input impedence based on this.  Do you know if the value you are trying to read at the time would set the range to a value that is compatible with the input impedence?

Thanks,

Sean Newton