MIL-PRF-83287G
3.4.8 Coils. Coils shall be electrically insulated from the frame and the case and shall be rigidly secured to prevent
any change in the relative position of the parts. Coils shall be designed for continuous operation at rated voltage.
3.4.9 Springs. Springs shall be fabricated from non-corrosive materials and may be plated, except that zinc,
cadmium, or unfused tin plating shall not be used within the case of the indicator.
3.4.10 Stabilization of permanent magnets. Permanent magnets and magnetic assemblies shall be artificially aged
to prevent decay of flux levels. The residual flux in the permanent magnet assemblies shall be reduced to a level
where it will not be affected by demagnetizing forces encountered in normal service, handling, or any of the tests
specified herein.
3.4.11 Diodes (when specified, see 3.1). Coil transient suppression and steering diodes shall be internally
connected as specified (see 3.1). The diodes shall not be caused to conduct or be damaged by the transient and
spike voltages permitted by MIL-STD-704. The diodes shall not be damaged or permit damage to the indicator if the
polarity of the coil voltage is reversed.
3.5 Insulation resistance. When measured as specified in 4.5.2, the insulation resistance shall be 100 megohms,
minimum.
3.6 Dielectric withstanding voltage. When indicators are tested as specified in 4.5.3, the leakage current shall not
exceed 1.0 milliampere (mA), and there shall be no evidence of damage due to arcing, flashover, or insulation
breakdown (see 3.10).
3.7 Operating voltage. When tested as specified in 4.5.4, indicators shall show no evidence of damage and shall
not malfunction (see 6.7 a). In addition, mechanically resettable indicators shall reset in 10 seconds, maximum (see
3.10).
3.7.1 Transfer pulse length. When the operating voltage is tested as specified in 4.5.4 c, indicators shall perform
as specified (see 3.1).
3.8 DC resistance. When indicators are tested as specified in 4.5.5, the dc resistance shall be within the
applicable minimum and maximum values specified (see 3.1).
3.9 Coil transient suppression (indicators with diodes only). When indicators are tested as specified in 4.5.6, the
maximum absolute value of the nonsteady-state voltage shall not exceed the nominal rated coil voltage by more than
50 percent.
3.10 Thermal shock. When tested as specified in 4.5.7, indicators shall meet the following requirements:
Visual inspection
There shall be no evidence of cracking, peeling, or
flaking of the finish.
Insulation resistance at +125°C (or
applicable temperature specified, see 3.1)
Shall be 100 megohms, minimum.
Dielectric withstanding voltage at -65°C, and
+125°C (or applicable temperature specified, see 3.1)
Shall be as specified in 3.6
Operating voltage at -65°C, and +125°C (or
applicable temperature specified, see 3.1)
Shall be as specified in 3.7, except for mechanically
resettable indicators at -65°C as follows:
a. The reset shall be accomplished electrically by
applying a pulse and reversing the polarity of the
input operating voltage.
b. If mechanically resetting, the reset shall be aided
(see 3.4.1.1) when testing at -65°C.
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