True Ground Speed Sensor (TGSS) 740
20
Appendix A
26.
Section 5.16.3
EMC Emissions
Y M
27.
Section 5.12 Level-2
Electrostatic Discharge
Y K
28.
Section 5.7
Particle Impact
Y D
9.1.1.1.
List of Deviations
A- Transient Load Dump
Transient Parameter
EP455 Requirement
Test Performed
Voltage Amplitude (Vs)
106 Volts
100 Volts
Source Impedance (Ri)
2.5
Ω
2
Ω
Pulse Duration (td)
188 ms
400 ms
Cycles 5
5
B- Transient Inductive Load Switching Power Lines
Transient Parameter
EP455 Requirement
Test Performed
Pulse Amplitude (Vs)
-300 Volts
-500 Volts
Source Impedance (Ri)
20
Ω
10
Ω
Pulse Duration (td)
1 ms
2 ms
Cycles 300
300
C- Mechanical Handling Shock
The test was performed with a drop distance of 1000 mm. It exceeded the EP455
requirement of 400mm.
D- Particle Impact
Samples were tested using an alternate method dropping the gravel from a height of
3.7m above the surface under test. The gravel was guided by a 3m long 12.7cm
diameter tube, which has its outlet 0.7m above the surface under test.
E- Mechanical Shock
Each sample was subjected to 100 applications of 400 m/sec2 6 msec shock pulses
on each axis. EP455 calls for application of a single 490 m/sec2 11msec half-sine
pulse on each axis.
F- Random Vibration
EP455 requirement calls for 2h minimum in each of 3 orthogonal axes at 52.4 m/s 2
RMS overall acceleration and power spectral density of 2m 2 /s 3 from 50 Hz to 2000
Hz, it was performed for 24 hours per BS 7691 (1994).
Frequency PSD
level
10
.005 g² /Hz
200
.020 g² /Hz
300
.010 g² /Hz
350
.002 g² /Hz
