Specification Confidence Levels; Using Absolute And Relative Uncertainty Specifications; Using Secondary Performance Specifications - Fluke 5700A Series Service Manual

5700A/5720A Series II Calibrator
Service Manual
Specifications are valid after a warm-up period of twice the time the calibrator has been
turned off, up to a maximum of 30 minutes. For example, if the calibrator has been turned
off for five minutes, the warm-up period is ten minutes.

1-25. Specification Confidence Levels

You calibrator's performance level is ensured by regular calibration to the primary
performance specifications, which are provided at both the 99% and 95% confidence
levels. The 95% confidence level will provide an accuracy that surpasses the accuracy
requirements for meeting Tag 4 standards, or a coverage factor of 2. Calibration at the
99% confidence level is also available for those applications that require a confidence
factor for the specifications that is higher than 95%. For information on selecting the
confidence level, refer to Chapter 4.
The tables in this chapter provide specifications at both the 95% and 99% confidence
levels for the 5700A/5720A Series II calibrators. Included with these tables are operating
specifications for using the calibrator with the Wideband AC Module (Option 5700A-03)
and the 5725A Amplifier.

1-26. Using Absolute and Relative Uncertainty Specifications

To evaluate the 5700A/5720A Series II coverage of your calibration workload, use the
Absolute Uncertainty specifications. Absolute uncertainty includes stability, temperature
coefficient, linearity, line and load regulation, and the traceability to external standards.
You do not need to add anything to absolute uncertainty to determine the ratios between
the calibrator's uncertainties and the uncertainties of your calibration workload.
Relative uncertainty specifications are provided for enhanced accuracy applications.
These specifications apply when range constants are adjusted (see "Range Calibration").
To calculate absolute uncertainty, you must combine the uncertainties of your external
standards and techniques with relative uncertainty.

1-27. Using Secondary Performance Specifications

Secondary performance specifications and operating characteristics are included in
uncertainty specifications. They are provided for special calibration requirements such as
stability or linearity testing.
1-12