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Agilent 3458A Uncertainty Calculation

Question asked by slyarbro on Oct 3, 2011
Latest reply on Oct 7, 2011 by slyarbro
I'm trying to do an expanded uncertainty calculation for my Agilent 3458 Digital Multimeter.  I noticed when looking at the specifications that there are many errors including RMS noise, linearity, and a temperature coefficient  as well as other sources of error.  When doing an overall expanded uncertainty calculation, do I include all these errors for an accurate representation of measurement uncertainty?  If so, do I combine all these errors in a linear combination, or do a root-sum-squares analysis treating them each as a separate error source?  I ask this mainly because in one of the examples on the first page of Appendix A the RMS error is added directly to the accuracy specification.