Rugged Environment
Switching Regulators 19"
PSL-Family
Edition 2/96 - Melcher AG
5 - 5
MELCHER
The Power Partners.
5.1
Table 6: MTBF and device hours
MTBF
Ground Fixed
Ground Mobile
Device Hours 1
MTBF acc. to MIL-HDBK-217D
TC = 40°C
TC = 70°C
TC = 40°C
TC = 70 °C
130'000 h
58'000 h
36'000 h
17'000 h
3'900'000 h
1 Statistical values, based on an average of 4300 working hours per year and in general field use
Electromagnetic Compatibility EMC
Immunity
General condition: Case earthed.
Table 7: Immunity type tests
Phenomenon
Standard
Class
Coupling
Value
Waveform
Source
Test
In
Per-
Level
mode 4
applied
Imped.
procedure
oper. form.
Impulse voltage
IEC 255-4
III
i/o, i/c, o/c
5000 Vp
1.2/50
s
500
3 pos. and 3 neg.
no
-
App. E4 5
+i/–i
impulses per
(1976)
coupling mode
High frequency
IEC 255-4
III
i/o, i/c, o/c
2500 Vp
400 damped
200
2 s per
yes
1
disturbance
App. E5 5
+i/–i
1000 Vp
1 MHz waves/s
coupling mode
(1976)
Voltage surge
IEC 571-1
i/c, +i/–i
800 Vp
100
s
100
yes
2
(1990-07)
1500 Vp
50
s
1 pos. and 1 neg.
voltage surge per
coupling mode
3000 Vp
5
s
4000 Vp
1
s
7000 Vp
100 ns
Electrostatic
IEC 801-2
4
contact discharge
8000 Vp
1/50 ns
330
10 positive and
yes
1 3 6
discharge
(1991-04)
to case
10 negative
discharges
Electric field
IEC 801-3
3
antenna in
10 V/m
sine wave mod-
26…1000 MHz
yes
1
(1984)
1m distance
ulated w. 1 kHz
Fast transient /
IEC 801-4
4
i/c, +i/–i
4000 Vp bursts of 5/50 ns
50
1 min positive
yes
1 3 6
burst
(1988)
5 kHz rep. rate
1 min negative
transients with
bursts per
15 ms burst
coupling mode
duration and a
300 ms period
Transient
IEC 801-5
III
i/c
2000 Vp
1.2/50
s
12
5 pos. and 5 neg.
yes
1 6
(Draft 1993-01)
+i/–i
1000 Vp
2
impulses per
coupling mode
Immunity to
IEC 801-6
3
i, o, signal wires
10 Vrms 7
80% amplitude
50
AM 0.15...80 MHz
yes
1
conducted
modulated
disturbancies
with 1 kHz
1 Normal operation, no deviation from specifications
2 Normal operation, temporary deviation from specs possible
3 With option C: manual reset
4 i = input, o = output, c = case
5 In correspondance with DIN 57435 part 303 and VDE 0435 part
303 (1984-09)
6 Option L neccessary
7 Open circuit
Emission
For emission levels refer to "Electrical Input and Output Data".