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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 Paper Number:
Date:
DO-160E Section:
Rev F #543C
5 April 2006
16
Author’s Name, Affiliation, and E-mail:
Paragraph:
Page:
JP Chaussonnet – EUROCAE
16.7.X (New)
TBD
As ac or dc equipment are qualified to sustain the voltage spike levels specified in section 17 and not
more, it appears as necessary to specify also the limits not to be exceeded by the voltage spikes that
could be produced by equipment when switched off.
These limits are derived from last issue of ISO 1540.
Caution: Spike levels specified in section 17 should also be updated with regard to 230 Vrms ac
equipment and 270 Vdc equipment. Indeed, max spike level applicable to 230 Vrms ac equipment is 1200
Vpk according to ISO 1540.
Proposal Disposition:
Accepted As Written
Withdrawn
Accepted As Modified
Rejected
Other
Rejection Reason:
Proposal Deferred To:
RTCA SC-135 Concurrence
EUROCAE WG-14 Concurrence
Proposal Disposition By:
Date:
Revise From:
New requirement
Revise To:
16.7.X Voltage spike due to equipment load switching
a.
Definition
A voltage spike is a voltage transient which duration is extremely short (from some
microseconds to tens of microseconds). Such a transient may be produced by
equipment when switched off.
b.
Requirement
The test setup shall be in accordance with Figure 16-XA.
Switch on the power source and then close the contact K to supply the EUT with:
 nominal voltage
 and 400 Hz for A(CF) category equipment
 and 360 Hz for VF equipment (*)
Proposal Page Number:
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SC-135 Change Proposal Form Rev C
Operate the EUT for at least one minute.
While maintaining the power source switched on, open the contact K. Any voltage spike
that might be then generated by the EUT with in 50mm of the EUT terminals shall be
within the limits specified in Figures 16-XB (ac equipment), 16-XC (Category A, B or Z
dc equipment) or 16-XD (Category D dc equipment).
(*) For VF equipment, the test will be repeated with a frequency of:
 650 Hz for A(NF) equipment
 800 Hz for A(WF) equipment
As Modified Text:
1. Waveform is monitored on UUT side of switch. (done)
2. Switch opening characteristics need to be defined. (Suggest less than 5X of fastest desired spike
measurement.)
3. Figure 16-xd is not visible.(Figure xd was deleted.)
4. Suggest adding a 10 uF capacitor across the power source for power source stabilization. (done)
5. Suggest adding a 0.1uF in series with a 50 ohm resistor across the EUT to standardize the test
impedance. Note: If K opens fast enough, the 1 meter of wire to the EUT will fail this test. (being
considered)
6. Evelyn suggested stopping the curve at 100 usec for DC equipment. Paul suggests stopping the curve
at 100 usec for all equipment.
7. The note:
NB: For equipment submitted to section 17 category B test, multiply the voltage levels deduced from Figure
16-XC (after application of its note) by following ratio Rv.
Rv = 2 x line voltage (AC rms and/or DC, or 200 V whichever is less) / 600
Is not clear and references a separate section of DO-160 for the test conditions.
8. We are assuming that this test is to be required for all equipment (not a new letter in section 16.)
9. The wire length from the switch to the EUT shall be 1m +0.1/-0m.
10. WG-16 believes that mutliply by 2 for 230V systems in inappropriate and should have same curve for
115V. Paul to discuss this with Mario.
11. Paul to check with Dave Wallen about referencing section 17 in this requirement.
12. Make sure we test the EUT, not the switch.
13. Make sure we update section 17 to have same test limits as in this proposal. Margin will come from the
attenuation in the aircraft wiring.
14. Christian/ Jean-Paul have a proposal to increase the 600V to 1200V for 230V ac and 270V dc
equipment. Kamiar believes we should stay at 600V.
Proposal Page Number:
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SC-135 Change Proposal Form Rev C
+ (dc) or phase (ac)
+ (dc) or phase (ac)
POWER SOURCE
EUT
K
- (dc) or neutral (ac)
- (dc) or neutral (ac)
Figure 16-XA: Test setup
[Update to show 10uf cap with in 0.15 m of switch.]
[Update to show lead length from EUT to switch to be 1.0 m +0.1m/-0m]
[Update to show a series RC with in 0.15m of switch on eut side of switch. 50 ohms and tbd (0.1) uF ]
Voltage 600
(Vpk) 500
400
300
200
100
0
-100
-200
-300
-400
-500
-600
-700
0.1
1
10
100
1000
10000
Time (Microseconds)
Figure 16-XB: Voltage spike limits for equipment - Categories D, A(CF), A(NF) and A(WF)
(applicable to equipment submitted to section 17 category A test)
For equipment submitted to section 17 category B test, multiply the voltage levels deduced from Figure 16-XB
(after application of its note) by following ratio Rv.
Proposal Page Number:
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Rv Proposal
= 2 x lineForm
supply
voltage
(AC rms and/or DC, or 200 V whichever is less) / 600
SC-135 Change
Rev
C
600
500
400
300
200
Voltage (Vpk)
200
100
0
-100
-170
-200
-300
NOTE: Voltages show n are for 28 Vdc input
equipment, multiply by 14/28 for
14 Vdc input equipment.
-400
-500
-600
1
10
50
100
1000
10000
Time (Microseconds)
Figure 16-XC: Voltage spike limits for DC equipment - Categories A, B and Z
(applicable to equipment submitted to section 17 category A test)
For equipment submitted to section 17 category B test, multiply the voltage levels deduced from Figure
16-XC (after application of its note) by following ratio Rv.
Rv = 2 x line voltage (AC rms and/or DC, or 200 V whichever is less) / 600
Proposal Page Number:
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SC-135 Change Proposal Form Rev C
Proposal Page Number:
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SC-135 Change Proposal Form Rev C