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5700A/5720A Series II Calibrator
Service Manual
3-6
3-4. Cleaning the Exterior
To keep the calibrator looking like new, clean the case, front panel keys, and lens using a
soft cloth slightly dampened with either water or a non-abrasive mild cleaning solution
that is not harmful to plastics.
Caution
Do not use aromatic hydrocarbons or chlorinated solvents for
cleaning. They can damage the plastic materials used in the
calibrator.
3-5. 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 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).
Calibration check and range calibration are optional procedures that are provided for
enhancing the accuracy if needed for special requirements.
3-6. 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 1Ω resistance standard, and a 10 kΩ
resistance standard. The following standards are recommended:
• Model 732B DC Reference Standard
• Model 742A-1 1Ω Resistance Standard
• Model 742A-10k 10Ω Resistance Standard
Use the following Low Thermal Leads for all connections:
• 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).
Warning
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.