Fluke 5720A service manual Cleaning the Exterior, Calibration

5700A/5720A Series II Calibrator

Service Manual

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.

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