AMETEK Compact i/iX Series Software Manual - Manual (Page 33)

User Manual - Rev H California Instruments
Avionics Software 33
3.3 –160 Option Special Features
DC ripple tests for 28VDC or 14VDC 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 DO160
Rev E 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
RTCA/DO160, Section 18, Figure 18-1 is required.
The DO160 DC Ripple test screen is available from the main screen, Applications, RTCA/DO160,
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.
Available test settings are 14VDC or 28VDC nominal, category A, Z or category B and phase/output
selection. For single-phase systems, only phase A can be selected. The test pattern is fixed per
section 18.3.1 with a ripple frequency range from 16 Hz to 5000 Hz per Figure 18-2 (Cat A,Z) or 18-3
(Cat B). 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 3-1: DO160E DC Ripple Test Window.
3.4 Test Tables
The tables shown on the next few pages list the test sections covered by the –160 option. Where
relevant, the numbering used matches that of the RTCA/DO-160 document. Test tables are listed by
power group
.