 |
|||
|
|
|||
| ||||||||||
|
|  MIL-S-17000N(SH)
During these tests, each supply voltage shall
wiring diagrams.
be applied to the
switchboard as appropriate for the conduct
of the tests. At
some time during these tests, all supply
voltages shall be
applied simultaneously.
4.6.1.2 Control indicators. Each unit shall be tested for circuit con-
tinuity (to determine conformance with switching functions shown on guidance
drawings) and absence of shorted or grounded circuits.
4.6.2 Supply line voltage and frequency variation. The tolerances speci-
fied in 3.6.25 shall be used as test settings for the purpose of determining that
performance meets specification requirements of the various panel mounted assem-
blies (such as rectifiers, signal generators, synchro signal converters) under
supply line voltage and frequency variations.
4.6.3 Dielectric withstanding voltage. Dielectric strength between
electrical circuits, and between electrical circuits and ground, shall be
tested with a nominal sinusoidal source of 60 Hz having a capacity of at least
1 kilowatt. Rms values of test voltages shall be as shown in table IX. The
dielectric withstanding voltage test shall not be applied to circuitry which
includes parts which would normally be damaged by the test voltages, such as
synchro, transistors, electrolytic capacitors, diodes and other voltage sensi-
tive components. Equipment shall be subjected to one high voltage test of the
applicable voltage specified herein. In dielectric tests, the voltage shall be
raised gradually to the specified value and shall be held at that value for the
periods specified in 4.6.3.2.
TABLE IX.
Dielectric withstanding voltages.
Circuit voltage of equipment tested
Rms of dielectric test voltage
volts
volts
Less than 60
450
60 to 120
900
Above 120 and less than 240
1200
240 to 480
1500
Above 480
Twice rated voltage plus 1000
4.6.3.1 When the dielectric withstanding voltage and insulation resis-
tance tests are not performed as part of the circuit continuity test (see
4.6.1.1), each control indicator or section of a switchboard shall be tested
separately. Terminals of the unit or assembly intended for connection to
external wiring shall be tested and all switches (except spring-return to-off
types) shall be in fully "on" positions for these tests.
4.6.3.2 For the dielectric withstanding voltage test conducted as part
of qualification inspection, the test voltage shall be held at the specified
value for 1 minute + 5 seconds. For the dielectric withstanding voltage test
conducted as part of quality conformance inspection, the test voltage shall be
held at the specified value for 5 + 1 second.
--
57
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals