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|  MIL-D-70789A (AR)
Average Field
Modulation*
Strength (V/m)
Frequency Range
CW
25
14
KHz
to
2 MHZ
CW, AM
50
2
MHz
to
20 MHz
CW, AM, FM
50
20
MHz
to
100 MHz
CW,AM
25
100
MHz
to
500 MHz
CW, AM
50
500
MHz
to
1,000 MHz
Pulse
50
400
MHz
to
1,200 MHz
Pulse
200
1,200
MHZ
to
18 GHz
*Modulation frequencies and waveforms shall be selected for
maximum potential susceptibility (i.e., instrument sending and
control frequencies, clock frequencies, etc.). Parameters of
fielded radars shall be considered in determining pulse
modulation
characteristics.
3.7.15 Electrostatic discharge. The DRU shall not be
damaged and shall operate as specified herein after being charged
to potential differences of up to 300,000 volts with respect to
ground potential, across a capacitance of 1,000 pf, and
subsequently being discharged to ground potential through a
series resistance of 500 ohms. Circuit modules, repair parts,
etc, shall not be damaged by electrostatic discharge generated by
normal handling during maintenance.
3.7.16
Lightninq.
The DRU shall not be damaged and shall operate as specified
herein after being subjected to close lightning strikes at
distances of 10 meters or greater. The idealized current
waveform generated by severe lightning strike is shown in Figure
19. The field strengths at 10 meters are:
3,200 A/m
Peak Magnetic Field
MV/m
3
Peak Electric Field
Electric Field Spectral Density:
Frequency
Field Density
160
V/m/Hz
10
Hz
V/m/Hz
3
100
Hz
0.5
V/m/Hz
1
KHz
500
V/m/Hz
10
KHz
KV/m/Hz
5
40
KHz
The DRU is permitted to turn off, without damage or loss of data
needed to reinintialize, when exposed to close lightning strikes.
74
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