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RTCA SC-135 and EUROCAE WG-14
Change Proposal Form
(One major comment per form.)
(Shaded blocks for committee use only.)
SC-135/WG-14 Paper Number: Date: 15-09-2010
DO-160F/ED-14F Section:
Rev G Frac#187
Author’s Name, Affiliation, and E-mail:
Paragraph:
Page:
Henning Stöfen, Airbus, [email protected]
18.4.a and figure 18-1
18-4, 18-5
Summary of Change (25 words or less):
Change the specified transformer output impedance to a realistic value with today’s equipment.
Reason for Change (Justification):
If we change the secondary limit from power to current, the output impedance of the transformer does not
have a direct impact on test severity anymore. We can allow for a wider range of impedances and
especially for lower impedances. Therefore, we do not need to reduce the performance of the test
equipment by introducing additional impedances as proposed in the user’s guide to section 18.
Revise From:
a. If the impedance of the test power leads is such that excessive power will be required
to generate the specified audio signal voltage level, the test conditions will be
adequately satisfied by the use of an audio amplifier with a maximum output of
100 W. The impedance of the output of the transformer shall be 0.6 Ohm ±50%.
Revise To:
a. If the impedance of the test power leads is such that excessive power will be required
to generate the specified audio signal voltage level, the test conditions will be
adequately satisfied by the use of an audio amplifier with a maximum output of
100 W. The generator impedance measured at the the outputs of the transformer shall be less than 0.9
Ohm.
Proposal Page Number:
1 of 2
SC-135/ED-14 Change Proposal Form Rev G
As Modified Text:
- Delete UG 18.A.3a, 18.A.3c.
- 18.A.4a, & 18.A.4b change source impedance to rated impedance
- Remove figure references of 0.6 ohm source impedances 18-1 & 18-2
X
Accepted As Written
Withdrawn
Accepted As Modified
Rejected
Deferred
Other
Rejection Reason / Comments:
Proposal Deferred To:
X
RTCA SC-135 Concurrence
Proposal Disposition By: WG14
SC 135
EUROCAE WG-14 Concurrence
Date: 15-09-2010
10/6/2010
Proposal Page Number:
2 of 2
SC-135/ED-14 Change Proposal Form Rev G