AMETEK Compact i/iX Series Software Manual - Manual (Page 64)

User Manual – Rev H California Instruments
64 Avionics Software
4.3 –B787 Option Special Features
DC ripple tests for 28VDC EUT‟s are provided through a separate control screen. This is required to
extend the range of the ripple frequency to 5000 Hz. The actual requirement for 787 Rev C is testing
up to 150 KHz ripple. This is out of the available range of the power source. To test to the full 150 KHz
range, an external audio generator and coupling transformer as outlined in 787B3-0147, Figure 18 is
required.
The B787 DC Ripple test screen is available from the main screen, Applications, Boeing, DC Ripple
Test menu. Once selected, the DC ripple test control screen is modal and must be closed before any
other tests can be run. Opening this screen requires several seconds as the power source is being
set up to perform the DC ripple tests. This screen also places the power source in AC+DC mode.
Note: This feature is not available on the Compact iX or Ls/Lx Series power sources.
Available test settings are phase/output selection. For single-phase systems, only phase A can be
selected. The test pattern is fixed per section B.5.5.2 with a ripple frequency range from 16 Hz to
5000 Hz per Figure 7. The frequency slew rate is 30 minutes for each decade covered or one hour
and 15 minutes total. Tests can be aborted sooner if needed.
Figure 4-1: B787 DC Ripple Test Window.
4.4 Test Tables
The tables shown on the next few pages list the test sections covered by the –787 option. Where
relevant, the numbering used matches that of the Boeing 787B3-0147 document. Test tables are
listed by power group
.