Calibration; Calibrating The 5700A/5720A Series Ii To External Standards; Calibration Requirements - Fluke 5700A Series II Service Manual

5700A/5720A Series II Calibrator
Service Manual

3-2. Calibration

This chapter provides procedures for calibrating the 5700A/5720A Series II to external
standards, adjusting the range if necessary, and for performing a calibration check.
Your calibrator is calibrated at the factory with constants that are traceable to NIST. In
order to maintain traceability, you only need to met the following requirements.
Calibration check and range calibration are optional procedures that are provided for
enhancing the accuracy if needed for special requirements.

3-3. Calibrating the 5700A/5720A Series II to External Standards

You must calibrate to external standards at the beginning of the calibration cycle. The
length of the cycle (24 hours, 90 days, 180 days, or one year) is selected in a setup menu
described in Chapter 4 of the 5700A/5720A Operators Manual.
To calibrate the 5700A/5720A Series II, you apply three portable standards to the output
binding posts: a 10V dc voltage standard, a 1 resistance standard, and a 10 k
resistance standard. The following standards are recommended:
Use the following Low Thermal Leads for all connections:
Operator accessible LETHAL VOLTAGES may be present on the
lugs at the end of these cables when used with instrumentation
capable of producing such voltages. These cables should be
used only when thermal emf performance is required. For other
applications, cables with operator protection form contact with
high voltages should be used.
3-4.

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.
3-4
Calibration to external standards must be completed at the beginning of the
calibration cycle
Performance verification must be completed every two years.
Zero Calibration must be performed every 30 days (refer to the 5700A/5720A Series
II Operators Manual).
Model 732B DC Reference Standard
Model 742A-1 1 Resistance Standard
Model 742A-10k 10 Resistance Standard
When calibrating the 5700A, use either the connector set 5440A-7002 (banana plugs)
or the set 5440A-7003 (spade lugs).
When calibrating the 5720A, use the set 5440A-7003 (spade lugs).
WXWarning