NI USB-6009 Analog Output Anomaly

Hi,

I am using an NI USB-6009 device to control a pressure control valve through the NI board's analog output terminals.  The user manual (http://www.ni.com/pdf/manuals/371303n.pdf page 17) clearly states that the board can generate voltage outputs from these two ports (AO0 and AO1) of 0 V to 5 V.  However, when I am setting up and testing the DAQ connection in LabVIEW and I put a voltmeter to the analog output, the voltage on the meter reads between 0 V and 11.2 V.  Any idea what is going on here?

Thank you for your help,

Richie