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|  MIL-C-51542(EA)
3.3 Performance.
3.3.1 Cycling burn-in. The converter shall be subjected to a cycling
burn-in which shall consist of 3 hours continuous operation under no load con-
ditions and 3 hours on-off operation in accordance with 4.4.4.1.
3.3.2 Operational characteristics. The converter shall conform to the sche-
matic representations specified in Drawings 5-19-6492 and 5-19-6437 and shall
perform as specified in 3.3.2.1 through 3.3.2.6 when the applicable voltages,
voltage phases, and load are applied to the specific junctions on the static
frequency converter.
3.3.2.1 DC voltage. The test point DC voltages from test points 1, 2, and 3
to test point 4 shall be between 10.75 and 13.25 when tested as specified in
4.4.4.2(b).
3.3.2.2 AC voltage. The test point AC voltage between test points 5 and 6
shall be greater than 2 volts when tested in accordance with 4.4.4.2(C).
3.3.2.3 Phasing. The phasing of the output shall be phase 1 on pin A, phase
2 on pin B and phase 3 on pin C of connector J8, when tested in accordance with
4.4.4.2(d).
3.3.2.4 Output voltage (line to line). The output line to line voltage with
load applied (see 6.3) shall be 208 + 15 Volts, root-mean-square (VRMS), when
tested in accordance with 4.4.4.2(e).
3.3.2.5 Output voltage (line to neutral). The output line to neutral volt-
age with load applied (see 6.3) shall be 120 -- 10 VRMS when tested in accor-
+
dance with 4.4.4.2(f).
3.3.2.6 Output frequency. The output frequency of each phase shall be 400 --
+
10 Hz when tested in accordance with 4.4.4.2(g).
Reliability.
3.4.
3.4.1 Preproduction reliability qualification. Prior to the start of regu-
lar production, the preproduction sample converters shall demonstrate accept-
able reliability when tested in the configuration specified in 4.4.4.1 in accor-
dance with task 302 of MIL-STD-781, using test plan IV of MIL-HDBK-781 with
minimum test mean time between failures (01 ) equal to 934 hours. An account-
able failure shall be defined as any deviation from the requirements specified
in 3.3.2.1 through 3.3.2.6.
3.4.2 Production reliability. The production reliability acceptance sample
for each lot shall demonstrate acceptable reliability when tested in the con-
figuration specified in 4.4.4.1 in accordance with task 302 of MIL-STD-781,
using test plan IV of MIL-HDBK-781 with a minimum test mean-time-between-
failures (01), equal to 934 hours. An accountable failure shall be defined as
any deviation from the requirements specified in 3.3.2.1 through 3.3.2,6,
3
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