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Page Title:
Test conditions and procedures. |
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|  MIL-D-70789A (AR)
contractor shall report, analyze and determine corrective action
for all failures which occur during the reliability
demonstration. The contractor shall treat all failures as
chargeable. The government will score all failures. The DRU
shall meet the requirements of paragraph 3.6.3.
4.8.6.2.2 Test conditions and procedures. The DRU
reliability demonstration shall consist of two types of test
cycles, a functional survey and a chamber test. One functional
test cycle shall be performed for each six chamber cycles. The
following performance parameters shall be measured and evaluated
to determine if the DRU is functioning properly:
a.
Horizontal Position.
b.
Altitude.
c.
Either Vehicle or Pointing Device Attitudes.
d. Initial Alignment Time.
Test records shall be maintained in accordance with MIL-STD-781,
Appendix D, Section 30.
4.8.6.2.2.1
Chamber test. The DRU shall be used in
COnfiguratiOn C, Figure 3, for chamber testing. The DRU shall be
operated as a free inertial survey system with four minute
simulated "Travel" periods between zero-velocity updates. The
chamber test cycle shall be in accordance with Figure 22. The
procedure for verification of the performance (accuracy) criteria
shall be detailed in the government approved test procedures.
Chamber test conditions and procedures will be as specified in
MIL-STD-781,Appendix B, Section 50.2 and Appendix D with the
following changes:
a.
Voltages.
32 V.
(1) Maximum:
16.4 V.
(2) Minimum:
24 v.
(3) Nominal:
At the start of the test the input voltage shall be adjusted
above the minimum turn on voltage, and then reduced to the
minimum operating voltage.
b.
Gun fire shock. The DRU shall be
exposed to
simulated gun fire shocks as shown in Figure 22. The
shock
spectra shall be in accordance with Figures 23,
24 and 25, with
an equal number of exposures in each axis. In
the vertical
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