MIL-PRF-38793C
3.2.3.3 Equipment list deviation. Contractors shall not deviate from the specified equipment list
and from the TAR stated in paragraph 3.2.3.2, without prior approval of the procuring activity.
The actual TAR shall be stated in the procedure, if the TAR is worse than four-to-one.
3.2.4 Section III - Preliminary operations. This section shall include test instrument, accessory,
and calibration equipment connections, warm up instructions, setup instructions, or other
operations that are preliminary to the complete calibration process.
3.2.4.1 Familiarization. Instructions, directing the technician to become familiar with the
procedure before beginning calibration, shall be included.
3.2.4.2 Special environmental conditions. Environmental conditions, beyond those normally
specified in facility requirements documents, affecting the accuracy or validity of measurements,
shall be described. An explanation of the reasons for the requirement shall also be included.
3.2.4.3 Test jigs and fixtures. When special test jigs and other test fixtures are required in the
calibration process, the necessary instructions, drawings, and schematics for the fabrication of
these jigs and fixtures, shall be included. The acquiring activity shall determine if they shall be
in the preliminary operations or in an appendix (see 6.2).
3.2.5 Section IV - Calibration process. This section shall describe the details (text, fixtures,
illustrations, and tables) essential to the calibration of the test instrument and peculiar
accessories.
3.2.5.1 Division of calibration process. The calibration process shall be divided into well
identified divisions that cover each general calibration area. Each division shall be arranged in a
logical sequence that will keep changes in connections, equipment setups, and control positions
to a minimum. The necessary equipment connections, control settings, and operations which
comprise the calibration process shall be described.
3.2.5.2 Procedure methods. The procedure shall utilize overall performance testing. Calibration
methods by measurement of the test instrument output, or end product, shall be employed. (For
example, power supplies of items such as signal generators, oscilloscopes, and electronic
voltmeters are tested indirectly by monitoring the output frequency or amplitude, or both).
3.2.5.2.1 Connection to internal components. The calibration shall be conducted without
connection of equipment to internal components of the test instrument unless such connection is
absolutely unavoidable.
3.2.5.2.2 Criteria for including characteristics. The contractor shall develop calibration
procedures if any of the following apply:
a. Characteristics (capabilities) that have performance limits which can reasonably be
expected to change with time, use, or handling shall be included.
b. Characteristics (capabilities) whose performance limits are described as
"approximate" shall not be verified.
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