TB 9-4931-537-35
GENERAL
1. Purpose. This bulletin
provides guidance and
procedures applicable to the
cross-
checks, intercomparisons, and visual inspections of measurement standards.
2. Applicability. This bulletin is
applicable to all TMDE
support activities (TSA),
Army National Guard (ARNG), and Government owned contractor operated facilities
(GOCO), except the U.S. Army Primary Standards Laboratory (APSL).
a. Cross-check.
A secondary transfer level functional comparison between
selected measurement standards to verify that no significant departure from assigned
tolerances has occurred.
b. Intercomparison. A secondary reference level functional comparison, or
operational check, between measurement standards to verify that no significant
departure from assigned tolerances has occurred.
c. Visual Inspection.
The physical inspection of a measurement standard for
apparent damage.
a. Cross-checks will be performed on designated transfer level measurement
standards, or equivalents, to verify the standards have not been damaged or accuracy
degraded during shipment and/or to prevent out-of-tolerance standards from being used
to perform calibrations.
b. Intercomparison checks will be performed by all reference level activities and
activities with reference level or higher capabilities. The intercomparison check is
required on reference level measurement standards being calibrated by the equipment
manufacturer or higher calibration activity. All items in the APSL Exchange Package
(APSLEP) will be intercompared and documented. This intercomparison will encompass
enough cardinal points to convince the person performing the intercomparison that the
item meets all required specifications.
c. A visual inspection will be performed on measurement standards that are
received from another calibration activity not located in the same building. These
inspections are performed to assure that standards have not been damaged or degraded
during transportation.