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Handling and Shipment of M&TE
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Guideline to Good Practices for Control and Calibration of Measuring
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Calibration of M&TE - On Site


DOE-STD-1054-93
3.4.4
Calibration of M&TE
3.4.4.1
M&TE should be calibrated using reference standards (secondary or
working) whose calibration has a known valid relationship to
nationally recognized standards or accepted values of natural physical
constants. If national standards do not exist, the basis for calibration
should be documented. The reference standard used should have an
accuracy at least four times greater than the device under test. If this
accuracy ratio cannot be met, analysis of the errors should be
estimated to provide a valid uncertainty of the calibration process.
3.4.4.2
M&TE Calibration Schedule and Interval
The standards laboratory, in conjunction with each department
manager responsible for M&TE, should establish and maintain a
calibration schedule for the M&TE (including primary, secondary, and
working standards. Specific items may be calibrated on a prior-to-use
basis rather than on a periodic basis.  These devices shall be
controlled as specified in Sections 3.4.3.1 and 3.4.3.2 (tagging and
storage).
The schedule should normally be divided by application departments.
The M&TE assigned to a department should be listed in calibration
due date order by the unique identification number of Section 3.4.2.3
and noun name.  Calibration dates for similar M&TE should be
staggered to ensure availability for day-to-day and peak needs. The
established scheduling organization should normally update and
distribute the schedule to the responsible department managers on a
quarterly basis.  Department managers should ensure that M&TE
under their cognizance is calibrated in accordance with the master
schedule.
The calibration intervals for M&TE should be established by the
cognizant department managers. The initial interval should be based
on the inherent stability characteristics of the device, the rate/level and
purpose of expected use, manufacturer's recommendation, and
historical data for similar equipment. Calibration intervals may be
revised, based on a review of previous calibration results and
maintenance history. Revision of calibration intervals should require
the approval of the cognizant department manager. Revisions should
be documented on the Calibration Interval Change Authorization form
(Appendix C) which should be filed in the maintenance history.
13


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