Resistance Standards
Care and Maintenance
Care and Maintenance
The only maintenance procedure for the 742A Series is occasional cleaning. The
following text gives cleaning instructions and precautions for handling.
Cleaning the 742A Series
To keep the 742A Series looking like new, clean the outer surfaces using a soft
cloth slightly dampened with water or a non-abrasive mild cleaning solution that
does not harm plastics.
Caution
Do not use aromatic hydrocarbons or chlorinated solvents for
cleaning. They can damage the plastic materials used in the
resistance standard.
Precautions for Handling
The 742A Series are designed for mechanical stability, but do not abuse the
standard with excessive shock. Avoid temperature extremes as mentioned under
“Storage Temperature Range”. When you transport the standard, it is
recommended that you use the Option 742A-7002 Transit Case for shock and
temperature protection. The case holds two 742A Series Resistance Standards.
Servicing Information
Because the 742A Series are certified and non-adjustable resistance standards,
they are considered non-user repairable. If the unit is damaged, it must be
returned to the factory for repair and calibration.
Recertification
For recertification, send the resistance standard to a Fluke technical center. For a
nominal fee, Fluke will remeasure and recertify the value of our 742A based on
comparison to standards traceable to the U.S. National Bureau of Standards. A
new temperature characterization chart is provided on recertification. If you wish,
you can record the changes at each recertification and use this data to more
closely predict the performance of you 742A.
9
