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Self-destruct timing control and firing circuit |
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|  MIL-E-48630(AR)
d) Voids on the flat vertical wall of the "D Hole" (and
associated channels) up to a maximum of 25% of the depth will be
allowed.
e) Sprue cutoff deviations shall be allowed to +.000" and -.040"
of the curved surface.
f) Slight irregularities on the spherical surface (associated
with the potting prematurely separating from the mold) within a 1"
radius of the "Sprue" center are permissible.
g) A potting void or hole at the bottom of the "D" hole,
exposing the battery case, of a maximum size of 1/8 inch long by
1/16 inch wide or 3/32 inch diameter is allowable provided the
battery case is below bottom surface of the "D" hole. Larger voids
will have potting material applied to cover the battery case and
allowed to air dry.
h) Delamination of potting from the printed wiring board shall
not be allowed (non-destructively viewed from the top of the board
only). Components and item designation (M718E1/M741E1 shall be
clearly visible through the potting material.
3.4 Environmental conditions.
3.4.1 Temperature. The electronic assembly shall perform as
required herein and in drawing 9342576 over a temperature range from
-25F to +125F.
3.4.2 Ballistic test. The electronic assembly shall perform as
required after exposure to gun launch and ground impact environments
of zone 8 in the M109A1 gun at 145F.
(See 4.5.25)
3.5 Electrical requirements.
3.5.1 Quiescent current. Current drawing shall be less than
300 microampere when powered by a supply voltage (VB) of 7.0 volts.
3.5.2 Self-destruct timing control and firing circuit
The electronic assembly shall provide timing
characteristics.
control and firing signals as specified in drawing 9342576 and the
following paragraphs. Unless otherwise specified VB = 7.0 volts and
ambient temperature (TA) shall be 75F.
3.5.2.1 Oscillator function. The primary time base (PTB)
oscillator and the test time base (TTB) oscillator circuits shall
oscillate at the periods specified in drawing 9342576 over the
(See 4.5.2, 4.5.3)
temperatures specified.
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