9-2
Section 9: Verifying the Model 9100 Accuracy Specification
Final Width = 215mm
9.3
Equipment Requirements
As stated earlier, the calibration standards required to verify that a 9100 is within its
published accuracy specifications must possess the necessary traceable accuracy. The
generally accepted minimum test uncertainty ratio (the ratio between the accuracy of the
9100 at a verification point and the absolute accuracy of the standard used to verify it at
that point) is 3:1, which must apply at all points being used to verify the 9100's accuracy.
Also note that the measuring equipment must operate within the optimum output
conditions of the 9100, as defined in the accuracy tables given in Section 7 of this
handbook — i.e. the measurement equipment should be able to operate within the relevant
9100's compliance limits so that no additional accuracy figures have to be taken into
account.
9.4
Interconnections
The form of interconnection required to ensure optimum conditions for verification
measurements will depend on the 9100 function being verified and on the measuring
equipment connected to the 9100's terminals. For functions which can be directly
calibrated (DC and AC Voltage, DC and AC Current, Resistance and Capacitance)
suitable connections are illustrated in the appropriate part of Section 10: Calibrating the
9100, in this handbook.
