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PTB oscillator crosscheck and arming time check |
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|  MIL-E-48630(AR)
4.5.4 Firing capacitor charge rate. Verify that the charge
rate does not exceed the value stated in 3.5.2.2. This test must be
done at the time of initial power application to the unit under test.
4.5.5 Sensor enable test. With the electronic assembly under
test connected to the test fixture, verify that State Code 1 occurs
at the time specified in 3.5.2.2. A shielded magnetic environment
is required for this test. State code test points and voltage are
defined in drawing 9342576.
4.5.6 PTB oscillator crosscheck and arming time check. With
the electronic assembly under test connected to the test fixture and
both the PTB and TTB oscillator circuits operating at their natural
frequencies, verify that the oscillator check circuit is operational
by stopping PTB at the maximum arming time (-0, +2 sec) specified in
3.5.2.2, and observing that the oscillator check circuit initiates
the turn on of the detonator firing circuit within 2 TTB periods
after the PTB oscillator is stopped. The observed fire pulse will
be of reduced amplitude and the criteria of 3.5.2.8 do not apply.
4.5.7 Low voltage detect test. With the electronic assembly
under test connected to the test fixture, verify that the low
-
voltage detect circuit initiates the turn on of the detonator firing
circuit at the temperature and voltage specified in 3.5.2.3. For
this test, it is required that both the PTB and TTB oscillators be
operating at their natural frequency, and that the initial supply
voltage be 7.0 .15 volts, linearly reduced at a rate of 7.0
(max.) volts/second until the low voltage detect circuit is
triggered.
4.5.8 Self-destruct signal test (Dwg. 9342551). With the
electronic assembly under test connected to the test fixture, verify
that the self-destruct signal, that initiates the turn on of the
detonator firing circuit, occurs at the PTB count specified in
3.5.2.4.1.
4.5.9 Self-destruct signal test (Dwg. 9342552). With the
electronic assembly under test connected to the test fixture, verify
that the self-destruct signal, that initiates the turn on of the
detonator firing circuit, occurs at the PTB count specified in
3.5.2.4.2.
4.5.10 TTB oscillator crosscheck. With the electronic assembly
under test connected to the test fixture, short TTB to supply
negative and verify that the detonator firing circuit is activated
within the time period specified in 3.5.2.6.
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