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Module time delay function test. |
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|  MIL-F-48877A (AR)
accelerate the S&A to 55 g's 0.5 g's in a direction which
simulates rocket launch. The arming time shall be recorded to
the nearest hundredth of a second using a calibrated timer. At
the completion of acceleration, the equipment shall be halted and
visual observation shall be made for the locking position of the
detent; to ascertain positive arming. At the completion of the
test, the S&A shall be returned to the safe position. Any S&A
that fails the requirement shall be classed defective and removed
from the lot.
WARNING :
This test may be dangerous, and should be performed
behind a suitable barricade.
4.5.17 Module time delay function test.
(See Figure 1)
A compensated voltage setter that represents the helicopter
setter system shall be used. After shorting pins 5, 6 and 4
together for seven seconds minimum, the module shall be capable
of accepting a setting charge from the compensated voltage setter
and exhibiting a corresponding time delay as listed in Table VI.
The time delay shall be the time interval from the time pin 2 is
connected to pin 4 and the leading edge of the output pulse exits
pin 3. The firing output pulse (pin 3) shall provide at least
1000 ergs of energy in less than 100 microseconds into an M84
detonator or a resistor of 3.5 1.5 ohms. Record the time delay
setting, function time delay and energy output (equal to, greater
than or less than by serial number or module lot no. Any module
that does not meet the requirement shall be classed defective and
removed from the lot.
Inadequate discharge of residual voltages could affect
NOTE:
the timing accuracy of the module. In certain cases, it
may require a second discharge operation. Therefore,
the contractor shall develop procedures to ensure that
the residual voltage of the timing and firing capacitors
is equal to or less than 0.005 volt when checked 14 days
after final discharging.
4.5.17.1 Module time delay function test.
(After tear down
from centrifuge lot Acceptance.) The module shall function
within the requirements of Table III (+70F only). If two or
more do not meet the requirements, the lot shall be rejected.
4.5.18 Module thermal shock. The module shall be subjected
to the Thermal Shock Test in accordance with MIL-STD-331, Test
C7. These modules shall then be subjected to the timing test as
specified in 4.5.18. Any module that does not meet the test
requirements shall be classed defective. Two defects shall be
cause for lot rejection.
4.5.19 S&A position check. The S&A position, before
insertion into the fuze, shall be inspected. Any armed S&A shall
be considered defective and removed from the lot, and the
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