Need info on stability of the NI 6723 analog output voltage

[HBopper]

I have a requirement which I plan to use a NI 6723 for. The question has come up as to the voltage stability with time ( for now, assume no temp. changes). A typical voltage for my application is 50 mVDC.  Testing is being run now to see, if any voltage changes occur over a long ( i.e. 1 - 2 hrs) period of time.  I don't see any "stability" info in the 6723 data sheet.  Would anyone suggest where I might find that info?  Or, do I have to call my local NI rep and start that long process?
 
Thanks,
 
Henry Park
US Genomics

[TheWoost]

Hi Henry, The specifications given for the NI 6723 on its product page indicate that the device should operate with an absolute
accuracy of 10.78mV over the voltage range of +/-10V.  An important point here though is that the DAC on
the card will settle within this +/-10.78mV of the value specified in
software if it is given the proper settling time.  For DC voltage
generation the settling time should not be an issue because you send a
fixed voltage update to the DAC, and since that voltage doesn't change
over time the initial settling time for the DAC to reach that value
should not be noticeable.  If you are wanting to generate at 50mVDC then an accuracy spec of +/-10.78mV may not be acceptable (results in an error of about 22%).  As an alternative, the PCI-6703 and PCI/PXI-6704 analog output devices all have an absolute accuracy spec of 1mV over the voltage range of +/-10V (2% error when generating at 50mVDC).Regards,Andrew WNational Instruments