MILPRF50884F
APPENDIX C
C.5 TEST EQUIPMENT, CALIBRATION, AND MEASUREMENTS
C.5.1 Test equipment and calibration. All tests and measurements for process control, qualification testing,
inspection of product for delivery (in-process and group A), or periodic conformance inspection (groups B or C) shall
be made with capable instruments whose accuracy has been verified. Calibration of measurement, test equipment,
and test standards that control the accuracy of inspection and test equipment and facilities shall be in accordance
with NCSL Z540.3, or equivalent. Calibrated test equipment and test standards shall be controlled, used, and stored
in a manner suitable to protect calibration integrity. Test equipment requiring calibration shall be identified and
labeled in accordance with NCSL Z540.3, or an equivalent system, approved by the qualifying activity.
C.5.1.1 Resolution of measurement devices and test equipment capability. Unless otherwise specified (see
A.3.1.1), the resolution of measurement devices and test equipment used for the evaluation of printed wiring board
performance shall be at least a factor of 10 better than the limits or tolerances of a value to be determined. For
example: A voltmeter would need a resolution of ±0.1 percent to determine a tolerance of ±1 percent. NOTE: State
of the art requirements in which a 10:1 ratio cannot be effectively achieved due to a lack of national standards shall
be justified and documented.
C.5.1.2 Electrical test frequency. When specified (see A.3.1.1), the frequency of the electrical test shall be the
specified operating frequency of the printed wiring board. Where a frequency range is specified, major functional
parameters shall be tested at the maximum and minimum frequencies of the range in addition to those tests
conducted at any specified frequency within the range. Whenever electrical tests are conducted on printed wiring
boards for which a range of frequencies, or more than a single operating frequency is specified, the frequency at
which tests are conducted shall be recorded along with the parameters measured at those frequencies.
C.5.2 Test methods.
C.5.2.1 Acquiring activity or manufacturer imposed tests. Acquiring activity or manufacturer imposed tests shall be
in accordance with the requirements specified in the master drawing. If any additional imposed tests detect a
problem, the manufacturer shall submit all panels/printed wiring boards in the lot to those tests to eliminate rejects
and shall take steps to determine and eliminate the cause of failure.
C.5.2.2 Test method alternatives or variations. Alternate test methods or variation from the specified test method
are allowed provided that it is demonstrated to the qualifying activity or their agent that such alternatives or variations
in no way relax the requirements of this specification or the referenced test method. Alternate test methods, or
variation from the specified test method, shall be approved by the qualifying activity or their agent before testing is
performed. For proposed test variations, a test method comparative error analysis shall be made available for
checking by the qualifying activity or their agent (see appendix B).
C.5.2.3 Procedure in case of test equipment malfunction or operator error. When it has been established that a
improper test is due to test equipment malfunction or operator error, the inspection facility shall document the results
of its investigations and corrective actions, if required, and shall make this information available to the qualifying
activity and the acquiring activity, as applicable.
C.5.3 Numeric reporting. The results of printed wiring board verification shall be presented in accordance with the
requirements outline herein.
C.5.3.1 Observed values (true and nominal). The specification limit requirements specified are for true values.
Nominal values are indicated by the inclusion of a tolerance. Proper allowance shall be made for measurement
errors (including those due to deviations from nominal test conditions) in establishing the working limits to be used for
the values to be measured, so that the values of the test specimen parameters (as they would be under nominal test
conditions) can be determined properly.
68
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business