Calibration Requirements; When To Adjust The Calibrator's Uncertainty Specifications - Fluke 5700A Series Service Manual

3-7.

Calibration Requirements

Both the calibrator and the recommended external standards have the ability to internally
control (or compensate for) ambient temperature variations. Therefore it is unnecessary to
keep the calibrator in tightly controlled temperatures during calibration. During the
calibration procedure, the calibrator prompts you to enter the ambient temperature, and
includes this information in specification readouts and output shift reports.
3-8.

When to Adjust the Calibrator's Uncertainty Specifications

Table 3-1 lists each external standard's uncertainty limit, and the 5700A/5720A Series II
uncertainty specifications that must adjusted accordingly if that limit is exceeded.
As long as the external standards have the uncertainties listed in Table 3-1, you do not
need to adjust the calibrator's absolute uncertainty specifications in Chapter 1. However,
if your standard's uncertainty exceeds the value in the table you must adjust some of the
calibrator's absolute uncertainty specifications by the algebraic difference between your
standard's uncertainty and the uncertainty limit listed in the Table 3-1. For example, if
the dc voltage standard has an uncertainty of ±2.5 ppm, then the 5700A and the 5720A
absolute uncertainty specifications listed in Table 3-1 for the traceable quantity of voltage
must all be increased by ±1 ppm.
Table 3-1. Standards for Calibrating 5700A/5720A Series II
Fluke Traceable
Standard Quantity
732B Voltage
742A-1 Resistance
742A-10k Resistance
Calibrating the 5700A/5720A Series II to External Standards
Nominal Uncertainty
Value Limit
10V ±1.5 ppm
1Ω ±10 ppm
10 kΩ ±4 ppm
Calibration and Verification
5700A/5720A Series II
Specifications susceptible to
Uncertainty Limit
dc volts, ac volts,
dc current, ac current
1Ω, 1.9Ω
ac current, dc current 10Ω to
100 MΩ
3
3-7