Section 9: Verifying the Model 9500B Accuracy Specification 9-1
Final Width = 215mm
9.1 About Section 9
Section 9 introduces the verification of Model 9500B performance,
including the issue of traceability and a verification procedure.
9.2 Need for Verification
9.2.1 Factory Calibration and Traceability
Factory calibration of the Model 9500B ensures full traceability up to
and including National Standards. Its traceable accuracy figures are
quoted in the specifications given in Section 7, and all relate to a 1-year
calibration interval These figures include all calibration uncertainties,
including those of National Standards, and therefore constitute absolute
accuracies.
9.2.2 Verification on Receipt from the Factory
Each 9500B is despatched from the factory with a Certificate of
Calibration, which gives detailed results of its pre-shipment performance.
However, organizations may wish to confirm that all instruments
perform within published specifications, on receipt from their
manufacturers.
Such verification is only possible, however, if the user's organization
possesses suitable standards equipment, of the necessary traceable
accuracy. Without these standards, users may rely on an external
support organization for verification, probably also using these
organizations to recalibrate the unit at appropriate intervals.
9.2.3 Verification after User-Calibration
Calibration against standards, as detailed in Section 10 of this handbook,
covers only the possible adjustments used to place corrections in the
Mainframe calibration memory. Pre-calibration and post-calibration
performance at each adjustment point can be assessed as part of the
adjustment procedure. However, to cover all the required points, the
procedure in this section should be used to verify pre- and post-
calibration performance.
Section 9 Verifying the Model 9500B Specification
9.3 Equipment Requirements
As stated earlier, the standards required to verify that 9500B is within
its published specifications must possess the necessary traceable
accuracy.
Also note that the standards must operate within the optimum output
conditions of the 9500B, 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 9500B limits so that no additional
accuracy figures have to be taken into account.
The specific equipment requirements for verifying individual functions
are listed in the sub-sections detailing their verification procedures.
9.4 Interconnections
The form of interconnection required to ensure optimum conditions for
verification measurements will depend on the individual function being
verified, and on the measuring equipment connected to the 9500B's
terminals. Suitable connections are described in the sub-sections
detailing the functions' verification procedures.
9.5 Verification Points
The accuracy specifications detailed in Section 7 of this handbook cover
the full range of output values which can be generated by 9500B, and
its accuracy can therefore be verified against the specification at any
number of points in these output ranges.
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