MIL-PRF-29504B
3.5 Optical performance requirements. Mated termini shall meet the
requirements of 3.5.1 and 3.5.2 when mated using the qualification connectors
specified in the associated specification sheets (see 3.1).
3.5.1 Insertion loss.
When measured in accordance with 4.8.2, the initial
insertion loss shall not
exceed the value specified in the associated
specification sheet (see
3.1). Unless otherwise specified (see 3.1), the
insertion loss shall not
exceed the value specified in the associated
specification sheet (see
3.1) at any time during testing of the terminus.
3.5.2 Discontinuity. When measured in accordance with 4.8.3, no
discontinuity shall occur. For multimode termini, a discontinuity is
considered to be a reduction of optical transmittance of 0.5 dB or more for a
duration of 50 microseconds or more. For single mode termini, a discontinuity
is considered to be a reduction of optical transmittance of 0.5 dB or more for
a duration of 100 milliseconds or more.
3.5.3 Return loss. When applicable and when measured in accordance with
4.8.4, the return loss of a multimode terminus shall be not greater than -30
dB. The return loss of a single-mode optical terminus shall be not greater
than -40 dB.
3.5.4 Change in optical transmittance. When measured in accordance with
4.8.5, the change in optical transmittance during or after any specified
environmental or mechanical requirement shall be not greater than 0.5 dB.
3.6
Inspection requirements.
3.6.1 Size. When examined in accordance with 4.9.3, the dimensions and
dimensional tolerances for these termini shall be as specified (see 3.1).
3.6.2 Weight. When tested in accordance with 4.9.4, the weight of the
termini shall be as specified (see 3.1).
3.6.3 Identification marking. When tested in accordance with 4.9.5, the
termini shall be marked as specified herein (see 3.7). All marking characters
on any surface of the termini shall be identifiable.
3.6.4 Terminus cleaning. After cleaning the terminus in accordance with
4.9 6, the optical insertion loss of 3.5.1 and the identification marking
requirements of 3.6.3 shall be met.
3.6.5 Circular runout. When measured as specified in 4.9.7, designated
surfaces must be within the total runout tolerance specified (see 3.1).
3.6.6 Terminus retention. When tested in a qualification connector (see
3.1) in accordance with 4.9.8 and subjected to axial loads of 22 pounds (98
N), termini shall be retained in their inserts and not exceed 0.015 inch (0.38
mm) displacement. Spring loaded termini may deflect more than 0.015 inch
(0.38 mm) but must return to within 0.015 inch (0.38 mm) of original position
after load is removed. This requirement applies only to termini with
retention mechanisms.
3.6.7 Terminus engagement and separation force. When specified in the
applicable specification sheet and tested in accordance with 4.9.9, the
terminus engagement and separation force shall be within the limits specified
(see 3.1).
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