When To Adjust Product Uncertainty - Fluke 5730A Calibration Manual

These standards are recommended:
•
Model 732A or 732B DC Reference Standard
•
Model 742A-1 1Ω Resistance Standard
•
Model 742A-10k 10Ω Resistance Standard
Use 5730A-7003 (spade lugs) Low Thermal Leads for all connections:
Both the Product and the recommended external standards have the ability to
internally control (or compensate for) ambient temperature variations. Therefore,
it is unnecessary to keep the Product in tightly-controlled temperatures during
calibration. During the calibration procedure, the Product prompts for the ambient
temperature, and includes this information in specification readouts and output
shift reports.
5440A-7002 and 5440A-7003 Low Thermal Lead sets include a third
cable specifically designed for completing Artifact Calibration. The
5730A-7002 and 5730A-7003 Low Thermal Lead sets do not include
the third cable for connection between reference standards.

When to Adjust Product Uncertainty

Table 2 lists each external uncertainty limit of the standards, and the Product
specifications that must be adjusted accordingly if that limit is exceeded.
As long as the external standards have the uncertainties listed in Table 2, it is not
necessary to adjust the Product absolute specifications. However, if uncertainty
of the in-house standard exceeds the value in the table, some of the absolute
specifications of the Product must be adjusted by the algebraic difference
between the standard uncertainty and the uncertainty limit listed in the Table 2.
For example, if the dc voltage standard has an uncertainty of 2.5 ppm, then the
absolute specifications listed in the Electrical Specification tables above for dc
volts, ac volts, dc current and ac current must all be increased by 1 ppm.
Fluke Traceable
Standard Quantity
732B Voltage
742A-1 Resistance
742A-10k Resistance
Note
Table 2. Standards for Calibration
Nominal Uncertainty
Value Limit
10 V 1.5 ppm
1 Ω
10 ppm
10 kΩ 2 ppm
Multifunction Calibrator
Calibration Procedures
Specifications susceptible to
Uncertainty Limit
dc volts, ac volts,
dc current, ac current
1 Ω, 1.9 Ω
ac current, dc current
10 Ω to 100 MΩ
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