MIL-DTL-83729C
4.6.4.1 At sea level. Choppers shall be tested in accordance with method 301 of MIL-STD-202. The following
details and exceptions shall apply:
Magnitude of test voltage: Unless otherwise specified (see 3.1 and 6.2.2), 200 V rms 60 Hz or 280 Vdc,
(a)
except across open contacts 2 times rated contact voltage shall be applied.
(b)
Points of application:
(1)
Between switching circuit and coil.
(2)
Between switching circuit and case or frame.
(3)
Between coil and case or frame.
(c)
Maximum leakage current: 100 µA.
(d)
Examination after test: Choppers shall be visually examined for evidence of arcing, flashover, insulation
breakdown, and damage.
4.6.4.2 At reduced barometric pressure. When applicable, choppers shall be tested in accordance with methods
105 and 301 of MIL-STD-202. The following details and exceptions shall apply:
(a)
Test condition letter of method 105: C.
(b)
(c)
Points of application: As specified in 4.6.4.1b.
(d)
Maximum leakage current: As specified in 4.6.4.1c.
Examination after test: As specified in 4.6.4.1d.
(e)
4.6.5 Insulation resistance (IR) (see 3.9). Choppers shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
(a)
Test condition letter: A.
(b)
Points of measurement: Measurements shall be made between mutually insulated terminals, and between
terminals and case.
4.6.6 Thermal shock and high and low temperature operation (see 3.10) (when specified) (see 3.1). Choppers shall
be tested in accordance with method 107 of MIL-STD-202. The following details and exceptions shall apply:
(a)
Test condition letter: A or B, as applicable, in accordance with the specified chopper temperature range.
(b)
Measurements: During the fifth cycle, at the completion of steps 1 and 3 and whiel maintaining the specified
temperatures, contact resistance and waveform characteristics shall be measured as specified in 4.6.3.1.2
and 4.6.3.7. After return to room temperature after thermal shock, contact resistance, starting voltage, IR
4.6.7 Salt spray (corrosion) (see 3.11). Choppers shall be tested in accordance with method 101 of MIL-STD-202.
The following details shall apply:
(a)
Test condition letter: B.
(b)
Measurements after exposure: Salt deposits shall be removed by a gentle wash. The choppers shall then
be air blasted and permitted to dry 24 hours at 40°C. After the drying period, choppers shall be visually
examined for evidence of excessive corrosion and oxidation. Contact resistance, dc coil resistance and
waveform characteristics (with nominal drive only) shall be measured as specified in 4.6.3.1.1, 4.6.3.2, and
4.6.3.7, respectively.
4.6.8 Sand and dust (see 3.12). Choppers shall be tested in accordance with method 110, test condition letter B, of
MIL-STD-202. At the end of the test period, DWV and waveform characteristics (with nominal drive only) shall be
14
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business